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![Naoya Horiguchi](/assets/img/avatar_default.png)
Now we have an easy access to hugepages' activeness, so existing helpers to get the information can be cleaned up. [akpm@linux-foundation.org: s/PageHugeActive/page_huge_active/] Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Hugh Dickins <hughd@google.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: Mel Gorman <mgorman@suse.de> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013 lines
51 KiB
C
2013 lines
51 KiB
C
/*
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* linux/mm/memory_hotplug.c
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*
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* Copyright (C)
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*/
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#include <linux/stddef.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/interrupt.h>
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#include <linux/pagemap.h>
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#include <linux/compiler.h>
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#include <linux/export.h>
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#include <linux/pagevec.h>
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#include <linux/writeback.h>
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <linux/cpu.h>
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#include <linux/memory.h>
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#include <linux/memory_hotplug.h>
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#include <linux/highmem.h>
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#include <linux/vmalloc.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/migrate.h>
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#include <linux/page-isolation.h>
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#include <linux/pfn.h>
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#include <linux/suspend.h>
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#include <linux/mm_inline.h>
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#include <linux/firmware-map.h>
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#include <linux/stop_machine.h>
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#include <linux/hugetlb.h>
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#include <linux/memblock.h>
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#include <linux/bootmem.h>
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#include <asm/tlbflush.h>
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#include "internal.h"
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/*
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* online_page_callback contains pointer to current page onlining function.
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* Initially it is generic_online_page(). If it is required it could be
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* changed by calling set_online_page_callback() for callback registration
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* and restore_online_page_callback() for generic callback restore.
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*/
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static void generic_online_page(struct page *page);
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static online_page_callback_t online_page_callback = generic_online_page;
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static DEFINE_MUTEX(online_page_callback_lock);
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/* The same as the cpu_hotplug lock, but for memory hotplug. */
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static struct {
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struct task_struct *active_writer;
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struct mutex lock; /* Synchronizes accesses to refcount, */
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/*
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* Also blocks the new readers during
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* an ongoing mem hotplug operation.
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*/
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int refcount;
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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struct lockdep_map dep_map;
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#endif
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} mem_hotplug = {
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.active_writer = NULL,
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.lock = __MUTEX_INITIALIZER(mem_hotplug.lock),
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.refcount = 0,
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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.dep_map = {.name = "mem_hotplug.lock" },
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#endif
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};
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/* Lockdep annotations for get/put_online_mems() and mem_hotplug_begin/end() */
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#define memhp_lock_acquire_read() lock_map_acquire_read(&mem_hotplug.dep_map)
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#define memhp_lock_acquire() lock_map_acquire(&mem_hotplug.dep_map)
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#define memhp_lock_release() lock_map_release(&mem_hotplug.dep_map)
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void get_online_mems(void)
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{
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might_sleep();
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if (mem_hotplug.active_writer == current)
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return;
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memhp_lock_acquire_read();
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mutex_lock(&mem_hotplug.lock);
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mem_hotplug.refcount++;
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mutex_unlock(&mem_hotplug.lock);
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}
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void put_online_mems(void)
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{
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if (mem_hotplug.active_writer == current)
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return;
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mutex_lock(&mem_hotplug.lock);
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if (WARN_ON(!mem_hotplug.refcount))
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mem_hotplug.refcount++; /* try to fix things up */
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if (!--mem_hotplug.refcount && unlikely(mem_hotplug.active_writer))
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wake_up_process(mem_hotplug.active_writer);
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mutex_unlock(&mem_hotplug.lock);
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memhp_lock_release();
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}
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void mem_hotplug_begin(void)
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{
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mem_hotplug.active_writer = current;
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memhp_lock_acquire();
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for (;;) {
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mutex_lock(&mem_hotplug.lock);
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if (likely(!mem_hotplug.refcount))
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break;
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__set_current_state(TASK_UNINTERRUPTIBLE);
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mutex_unlock(&mem_hotplug.lock);
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schedule();
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}
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}
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void mem_hotplug_done(void)
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{
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mem_hotplug.active_writer = NULL;
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mutex_unlock(&mem_hotplug.lock);
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memhp_lock_release();
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}
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/* add this memory to iomem resource */
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static struct resource *register_memory_resource(u64 start, u64 size)
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{
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struct resource *res;
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res = kzalloc(sizeof(struct resource), GFP_KERNEL);
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BUG_ON(!res);
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res->name = "System RAM";
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res->start = start;
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res->end = start + size - 1;
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res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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if (request_resource(&iomem_resource, res) < 0) {
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pr_debug("System RAM resource %pR cannot be added\n", res);
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kfree(res);
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res = NULL;
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}
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return res;
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}
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static void release_memory_resource(struct resource *res)
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{
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if (!res)
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return;
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release_resource(res);
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kfree(res);
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return;
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}
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#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
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void get_page_bootmem(unsigned long info, struct page *page,
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unsigned long type)
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{
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page->lru.next = (struct list_head *) type;
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SetPagePrivate(page);
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set_page_private(page, info);
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atomic_inc(&page->_count);
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}
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void put_page_bootmem(struct page *page)
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{
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unsigned long type;
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type = (unsigned long) page->lru.next;
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BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
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type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE);
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if (atomic_dec_return(&page->_count) == 1) {
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ClearPagePrivate(page);
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set_page_private(page, 0);
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INIT_LIST_HEAD(&page->lru);
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free_reserved_page(page);
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}
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}
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#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
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#ifndef CONFIG_SPARSEMEM_VMEMMAP
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static void register_page_bootmem_info_section(unsigned long start_pfn)
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{
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unsigned long *usemap, mapsize, section_nr, i;
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struct mem_section *ms;
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struct page *page, *memmap;
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section_nr = pfn_to_section_nr(start_pfn);
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ms = __nr_to_section(section_nr);
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/* Get section's memmap address */
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memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
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/*
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* Get page for the memmap's phys address
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* XXX: need more consideration for sparse_vmemmap...
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*/
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page = virt_to_page(memmap);
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mapsize = sizeof(struct page) * PAGES_PER_SECTION;
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mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT;
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/* remember memmap's page */
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for (i = 0; i < mapsize; i++, page++)
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get_page_bootmem(section_nr, page, SECTION_INFO);
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usemap = __nr_to_section(section_nr)->pageblock_flags;
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page = virt_to_page(usemap);
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mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT;
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for (i = 0; i < mapsize; i++, page++)
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get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
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}
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#else /* CONFIG_SPARSEMEM_VMEMMAP */
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static void register_page_bootmem_info_section(unsigned long start_pfn)
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{
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unsigned long *usemap, mapsize, section_nr, i;
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struct mem_section *ms;
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struct page *page, *memmap;
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if (!pfn_valid(start_pfn))
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return;
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section_nr = pfn_to_section_nr(start_pfn);
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ms = __nr_to_section(section_nr);
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memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
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register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION);
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usemap = __nr_to_section(section_nr)->pageblock_flags;
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page = virt_to_page(usemap);
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mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT;
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for (i = 0; i < mapsize; i++, page++)
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get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
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}
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#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
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void register_page_bootmem_info_node(struct pglist_data *pgdat)
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{
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unsigned long i, pfn, end_pfn, nr_pages;
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int node = pgdat->node_id;
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struct page *page;
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struct zone *zone;
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nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT;
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page = virt_to_page(pgdat);
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for (i = 0; i < nr_pages; i++, page++)
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get_page_bootmem(node, page, NODE_INFO);
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zone = &pgdat->node_zones[0];
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for (; zone < pgdat->node_zones + MAX_NR_ZONES - 1; zone++) {
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if (zone_is_initialized(zone)) {
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nr_pages = zone->wait_table_hash_nr_entries
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* sizeof(wait_queue_head_t);
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nr_pages = PAGE_ALIGN(nr_pages) >> PAGE_SHIFT;
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page = virt_to_page(zone->wait_table);
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for (i = 0; i < nr_pages; i++, page++)
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get_page_bootmem(node, page, NODE_INFO);
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}
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}
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pfn = pgdat->node_start_pfn;
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end_pfn = pgdat_end_pfn(pgdat);
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/* register section info */
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for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
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/*
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* Some platforms can assign the same pfn to multiple nodes - on
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* node0 as well as nodeN. To avoid registering a pfn against
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* multiple nodes we check that this pfn does not already
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* reside in some other nodes.
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*/
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if (pfn_valid(pfn) && (pfn_to_nid(pfn) == node))
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register_page_bootmem_info_section(pfn);
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}
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}
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#endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */
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static void __meminit grow_zone_span(struct zone *zone, unsigned long start_pfn,
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unsigned long end_pfn)
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{
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unsigned long old_zone_end_pfn;
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zone_span_writelock(zone);
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old_zone_end_pfn = zone_end_pfn(zone);
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if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn)
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zone->zone_start_pfn = start_pfn;
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zone->spanned_pages = max(old_zone_end_pfn, end_pfn) -
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zone->zone_start_pfn;
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zone_span_writeunlock(zone);
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}
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static void resize_zone(struct zone *zone, unsigned long start_pfn,
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unsigned long end_pfn)
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{
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zone_span_writelock(zone);
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if (end_pfn - start_pfn) {
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zone->zone_start_pfn = start_pfn;
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zone->spanned_pages = end_pfn - start_pfn;
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} else {
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/*
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* make it consist as free_area_init_core(),
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* if spanned_pages = 0, then keep start_pfn = 0
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*/
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zone->zone_start_pfn = 0;
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zone->spanned_pages = 0;
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}
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zone_span_writeunlock(zone);
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}
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static void fix_zone_id(struct zone *zone, unsigned long start_pfn,
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unsigned long end_pfn)
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{
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enum zone_type zid = zone_idx(zone);
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int nid = zone->zone_pgdat->node_id;
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unsigned long pfn;
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for (pfn = start_pfn; pfn < end_pfn; pfn++)
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set_page_links(pfn_to_page(pfn), zid, nid, pfn);
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}
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/* Can fail with -ENOMEM from allocating a wait table with vmalloc() or
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* alloc_bootmem_node_nopanic()/memblock_virt_alloc_node_nopanic() */
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static int __ref ensure_zone_is_initialized(struct zone *zone,
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unsigned long start_pfn, unsigned long num_pages)
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{
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if (!zone_is_initialized(zone))
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return init_currently_empty_zone(zone, start_pfn, num_pages,
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MEMMAP_HOTPLUG);
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return 0;
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}
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static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2,
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unsigned long start_pfn, unsigned long end_pfn)
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{
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int ret;
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unsigned long flags;
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unsigned long z1_start_pfn;
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ret = ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn);
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if (ret)
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return ret;
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pgdat_resize_lock(z1->zone_pgdat, &flags);
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/* can't move pfns which are higher than @z2 */
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if (end_pfn > zone_end_pfn(z2))
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goto out_fail;
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/* the move out part must be at the left most of @z2 */
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if (start_pfn > z2->zone_start_pfn)
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goto out_fail;
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/* must included/overlap */
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if (end_pfn <= z2->zone_start_pfn)
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goto out_fail;
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/* use start_pfn for z1's start_pfn if z1 is empty */
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if (!zone_is_empty(z1))
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z1_start_pfn = z1->zone_start_pfn;
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else
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z1_start_pfn = start_pfn;
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resize_zone(z1, z1_start_pfn, end_pfn);
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resize_zone(z2, end_pfn, zone_end_pfn(z2));
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pgdat_resize_unlock(z1->zone_pgdat, &flags);
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fix_zone_id(z1, start_pfn, end_pfn);
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return 0;
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out_fail:
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pgdat_resize_unlock(z1->zone_pgdat, &flags);
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return -1;
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}
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static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2,
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unsigned long start_pfn, unsigned long end_pfn)
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{
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int ret;
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unsigned long flags;
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unsigned long z2_end_pfn;
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ret = ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn);
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if (ret)
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return ret;
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pgdat_resize_lock(z1->zone_pgdat, &flags);
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/* can't move pfns which are lower than @z1 */
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if (z1->zone_start_pfn > start_pfn)
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goto out_fail;
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/* the move out part mast at the right most of @z1 */
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if (zone_end_pfn(z1) > end_pfn)
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goto out_fail;
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/* must included/overlap */
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if (start_pfn >= zone_end_pfn(z1))
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goto out_fail;
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/* use end_pfn for z2's end_pfn if z2 is empty */
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if (!zone_is_empty(z2))
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z2_end_pfn = zone_end_pfn(z2);
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else
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z2_end_pfn = end_pfn;
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resize_zone(z1, z1->zone_start_pfn, start_pfn);
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resize_zone(z2, start_pfn, z2_end_pfn);
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pgdat_resize_unlock(z1->zone_pgdat, &flags);
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fix_zone_id(z2, start_pfn, end_pfn);
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return 0;
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out_fail:
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pgdat_resize_unlock(z1->zone_pgdat, &flags);
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return -1;
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}
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static void __meminit grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn,
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unsigned long end_pfn)
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{
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unsigned long old_pgdat_end_pfn = pgdat_end_pfn(pgdat);
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if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn)
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pgdat->node_start_pfn = start_pfn;
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pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) -
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pgdat->node_start_pfn;
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}
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static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn)
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{
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struct pglist_data *pgdat = zone->zone_pgdat;
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int nr_pages = PAGES_PER_SECTION;
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int nid = pgdat->node_id;
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int zone_type;
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unsigned long flags;
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int ret;
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zone_type = zone - pgdat->node_zones;
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ret = ensure_zone_is_initialized(zone, phys_start_pfn, nr_pages);
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if (ret)
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return ret;
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pgdat_resize_lock(zone->zone_pgdat, &flags);
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grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages);
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grow_pgdat_span(zone->zone_pgdat, phys_start_pfn,
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phys_start_pfn + nr_pages);
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pgdat_resize_unlock(zone->zone_pgdat, &flags);
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memmap_init_zone(nr_pages, nid, zone_type,
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phys_start_pfn, MEMMAP_HOTPLUG);
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return 0;
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}
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static int __meminit __add_section(int nid, struct zone *zone,
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unsigned long phys_start_pfn)
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{
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int ret;
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if (pfn_valid(phys_start_pfn))
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return -EEXIST;
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ret = sparse_add_one_section(zone, phys_start_pfn);
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if (ret < 0)
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return ret;
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ret = __add_zone(zone, phys_start_pfn);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return register_new_memory(nid, __pfn_to_section(phys_start_pfn));
|
|
}
|
|
|
|
/*
|
|
* Reasonably generic function for adding memory. It is
|
|
* expected that archs that support memory hotplug will
|
|
* call this function after deciding the zone to which to
|
|
* add the new pages.
|
|
*/
|
|
int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,
|
|
unsigned long nr_pages)
|
|
{
|
|
unsigned long i;
|
|
int err = 0;
|
|
int start_sec, end_sec;
|
|
/* during initialize mem_map, align hot-added range to section */
|
|
start_sec = pfn_to_section_nr(phys_start_pfn);
|
|
end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1);
|
|
|
|
for (i = start_sec; i <= end_sec; i++) {
|
|
err = __add_section(nid, zone, section_nr_to_pfn(i));
|
|
|
|
/*
|
|
* EEXIST is finally dealt with by ioresource collision
|
|
* check. see add_memory() => register_memory_resource()
|
|
* Warning will be printed if there is collision.
|
|
*/
|
|
if (err && (err != -EEXIST))
|
|
break;
|
|
err = 0;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__add_pages);
|
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
/* find the smallest valid pfn in the range [start_pfn, end_pfn) */
|
|
static int find_smallest_section_pfn(int nid, struct zone *zone,
|
|
unsigned long start_pfn,
|
|
unsigned long end_pfn)
|
|
{
|
|
struct mem_section *ms;
|
|
|
|
for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) {
|
|
ms = __pfn_to_section(start_pfn);
|
|
|
|
if (unlikely(!valid_section(ms)))
|
|
continue;
|
|
|
|
if (unlikely(pfn_to_nid(start_pfn) != nid))
|
|
continue;
|
|
|
|
if (zone && zone != page_zone(pfn_to_page(start_pfn)))
|
|
continue;
|
|
|
|
return start_pfn;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* find the biggest valid pfn in the range [start_pfn, end_pfn). */
|
|
static int find_biggest_section_pfn(int nid, struct zone *zone,
|
|
unsigned long start_pfn,
|
|
unsigned long end_pfn)
|
|
{
|
|
struct mem_section *ms;
|
|
unsigned long pfn;
|
|
|
|
/* pfn is the end pfn of a memory section. */
|
|
pfn = end_pfn - 1;
|
|
for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) {
|
|
ms = __pfn_to_section(pfn);
|
|
|
|
if (unlikely(!valid_section(ms)))
|
|
continue;
|
|
|
|
if (unlikely(pfn_to_nid(pfn) != nid))
|
|
continue;
|
|
|
|
if (zone && zone != page_zone(pfn_to_page(pfn)))
|
|
continue;
|
|
|
|
return pfn;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void shrink_zone_span(struct zone *zone, unsigned long start_pfn,
|
|
unsigned long end_pfn)
|
|
{
|
|
unsigned long zone_start_pfn = zone->zone_start_pfn;
|
|
unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */
|
|
unsigned long zone_end_pfn = z;
|
|
unsigned long pfn;
|
|
struct mem_section *ms;
|
|
int nid = zone_to_nid(zone);
|
|
|
|
zone_span_writelock(zone);
|
|
if (zone_start_pfn == start_pfn) {
|
|
/*
|
|
* If the section is smallest section in the zone, it need
|
|
* shrink zone->zone_start_pfn and zone->zone_spanned_pages.
|
|
* In this case, we find second smallest valid mem_section
|
|
* for shrinking zone.
|
|
*/
|
|
pfn = find_smallest_section_pfn(nid, zone, end_pfn,
|
|
zone_end_pfn);
|
|
if (pfn) {
|
|
zone->zone_start_pfn = pfn;
|
|
zone->spanned_pages = zone_end_pfn - pfn;
|
|
}
|
|
} else if (zone_end_pfn == end_pfn) {
|
|
/*
|
|
* If the section is biggest section in the zone, it need
|
|
* shrink zone->spanned_pages.
|
|
* In this case, we find second biggest valid mem_section for
|
|
* shrinking zone.
|
|
*/
|
|
pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn,
|
|
start_pfn);
|
|
if (pfn)
|
|
zone->spanned_pages = pfn - zone_start_pfn + 1;
|
|
}
|
|
|
|
/*
|
|
* The section is not biggest or smallest mem_section in the zone, it
|
|
* only creates a hole in the zone. So in this case, we need not
|
|
* change the zone. But perhaps, the zone has only hole data. Thus
|
|
* it check the zone has only hole or not.
|
|
*/
|
|
pfn = zone_start_pfn;
|
|
for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) {
|
|
ms = __pfn_to_section(pfn);
|
|
|
|
if (unlikely(!valid_section(ms)))
|
|
continue;
|
|
|
|
if (page_zone(pfn_to_page(pfn)) != zone)
|
|
continue;
|
|
|
|
/* If the section is current section, it continues the loop */
|
|
if (start_pfn == pfn)
|
|
continue;
|
|
|
|
/* If we find valid section, we have nothing to do */
|
|
zone_span_writeunlock(zone);
|
|
return;
|
|
}
|
|
|
|
/* The zone has no valid section */
|
|
zone->zone_start_pfn = 0;
|
|
zone->spanned_pages = 0;
|
|
zone_span_writeunlock(zone);
|
|
}
|
|
|
|
static void shrink_pgdat_span(struct pglist_data *pgdat,
|
|
unsigned long start_pfn, unsigned long end_pfn)
|
|
{
|
|
unsigned long pgdat_start_pfn = pgdat->node_start_pfn;
|
|
unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */
|
|
unsigned long pgdat_end_pfn = p;
|
|
unsigned long pfn;
|
|
struct mem_section *ms;
|
|
int nid = pgdat->node_id;
|
|
|
|
if (pgdat_start_pfn == start_pfn) {
|
|
/*
|
|
* If the section is smallest section in the pgdat, it need
|
|
* shrink pgdat->node_start_pfn and pgdat->node_spanned_pages.
|
|
* In this case, we find second smallest valid mem_section
|
|
* for shrinking zone.
|
|
*/
|
|
pfn = find_smallest_section_pfn(nid, NULL, end_pfn,
|
|
pgdat_end_pfn);
|
|
if (pfn) {
|
|
pgdat->node_start_pfn = pfn;
|
|
pgdat->node_spanned_pages = pgdat_end_pfn - pfn;
|
|
}
|
|
} else if (pgdat_end_pfn == end_pfn) {
|
|
/*
|
|
* If the section is biggest section in the pgdat, it need
|
|
* shrink pgdat->node_spanned_pages.
|
|
* In this case, we find second biggest valid mem_section for
|
|
* shrinking zone.
|
|
*/
|
|
pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn,
|
|
start_pfn);
|
|
if (pfn)
|
|
pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1;
|
|
}
|
|
|
|
/*
|
|
* If the section is not biggest or smallest mem_section in the pgdat,
|
|
* it only creates a hole in the pgdat. So in this case, we need not
|
|
* change the pgdat.
|
|
* But perhaps, the pgdat has only hole data. Thus it check the pgdat
|
|
* has only hole or not.
|
|
*/
|
|
pfn = pgdat_start_pfn;
|
|
for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) {
|
|
ms = __pfn_to_section(pfn);
|
|
|
|
if (unlikely(!valid_section(ms)))
|
|
continue;
|
|
|
|
if (pfn_to_nid(pfn) != nid)
|
|
continue;
|
|
|
|
/* If the section is current section, it continues the loop */
|
|
if (start_pfn == pfn)
|
|
continue;
|
|
|
|
/* If we find valid section, we have nothing to do */
|
|
return;
|
|
}
|
|
|
|
/* The pgdat has no valid section */
|
|
pgdat->node_start_pfn = 0;
|
|
pgdat->node_spanned_pages = 0;
|
|
}
|
|
|
|
static void __remove_zone(struct zone *zone, unsigned long start_pfn)
|
|
{
|
|
struct pglist_data *pgdat = zone->zone_pgdat;
|
|
int nr_pages = PAGES_PER_SECTION;
|
|
int zone_type;
|
|
unsigned long flags;
|
|
|
|
zone_type = zone - pgdat->node_zones;
|
|
|
|
pgdat_resize_lock(zone->zone_pgdat, &flags);
|
|
shrink_zone_span(zone, start_pfn, start_pfn + nr_pages);
|
|
shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages);
|
|
pgdat_resize_unlock(zone->zone_pgdat, &flags);
|
|
}
|
|
|
|
static int __remove_section(struct zone *zone, struct mem_section *ms)
|
|
{
|
|
unsigned long start_pfn;
|
|
int scn_nr;
|
|
int ret = -EINVAL;
|
|
|
|
if (!valid_section(ms))
|
|
return ret;
|
|
|
|
ret = unregister_memory_section(ms);
|
|
if (ret)
|
|
return ret;
|
|
|
|
scn_nr = __section_nr(ms);
|
|
start_pfn = section_nr_to_pfn(scn_nr);
|
|
__remove_zone(zone, start_pfn);
|
|
|
|
sparse_remove_one_section(zone, ms);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __remove_pages() - remove sections of pages from a zone
|
|
* @zone: zone from which pages need to be removed
|
|
* @phys_start_pfn: starting pageframe (must be aligned to start of a section)
|
|
* @nr_pages: number of pages to remove (must be multiple of section size)
|
|
*
|
|
* Generic helper function to remove section mappings and sysfs entries
|
|
* for the section of the memory we are removing. Caller needs to make
|
|
* sure that pages are marked reserved and zones are adjust properly by
|
|
* calling offline_pages().
|
|
*/
|
|
int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
|
|
unsigned long nr_pages)
|
|
{
|
|
unsigned long i;
|
|
int sections_to_remove;
|
|
resource_size_t start, size;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* We can only remove entire sections
|
|
*/
|
|
BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK);
|
|
BUG_ON(nr_pages % PAGES_PER_SECTION);
|
|
|
|
start = phys_start_pfn << PAGE_SHIFT;
|
|
size = nr_pages * PAGE_SIZE;
|
|
ret = release_mem_region_adjustable(&iomem_resource, start, size);
|
|
if (ret) {
|
|
resource_size_t endres = start + size - 1;
|
|
|
|
pr_warn("Unable to release resource <%pa-%pa> (%d)\n",
|
|
&start, &endres, ret);
|
|
}
|
|
|
|
sections_to_remove = nr_pages / PAGES_PER_SECTION;
|
|
for (i = 0; i < sections_to_remove; i++) {
|
|
unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION;
|
|
ret = __remove_section(zone, __pfn_to_section(pfn));
|
|
if (ret)
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__remove_pages);
|
|
#endif /* CONFIG_MEMORY_HOTREMOVE */
|
|
|
|
int set_online_page_callback(online_page_callback_t callback)
|
|
{
|
|
int rc = -EINVAL;
|
|
|
|
get_online_mems();
|
|
mutex_lock(&online_page_callback_lock);
|
|
|
|
if (online_page_callback == generic_online_page) {
|
|
online_page_callback = callback;
|
|
rc = 0;
|
|
}
|
|
|
|
mutex_unlock(&online_page_callback_lock);
|
|
put_online_mems();
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(set_online_page_callback);
|
|
|
|
int restore_online_page_callback(online_page_callback_t callback)
|
|
{
|
|
int rc = -EINVAL;
|
|
|
|
get_online_mems();
|
|
mutex_lock(&online_page_callback_lock);
|
|
|
|
if (online_page_callback == callback) {
|
|
online_page_callback = generic_online_page;
|
|
rc = 0;
|
|
}
|
|
|
|
mutex_unlock(&online_page_callback_lock);
|
|
put_online_mems();
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(restore_online_page_callback);
|
|
|
|
void __online_page_set_limits(struct page *page)
|
|
{
|
|
}
|
|
EXPORT_SYMBOL_GPL(__online_page_set_limits);
|
|
|
|
void __online_page_increment_counters(struct page *page)
|
|
{
|
|
adjust_managed_page_count(page, 1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__online_page_increment_counters);
|
|
|
|
void __online_page_free(struct page *page)
|
|
{
|
|
__free_reserved_page(page);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__online_page_free);
|
|
|
|
static void generic_online_page(struct page *page)
|
|
{
|
|
__online_page_set_limits(page);
|
|
__online_page_increment_counters(page);
|
|
__online_page_free(page);
|
|
}
|
|
|
|
static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages,
|
|
void *arg)
|
|
{
|
|
unsigned long i;
|
|
unsigned long onlined_pages = *(unsigned long *)arg;
|
|
struct page *page;
|
|
if (PageReserved(pfn_to_page(start_pfn)))
|
|
for (i = 0; i < nr_pages; i++) {
|
|
page = pfn_to_page(start_pfn + i);
|
|
(*online_page_callback)(page);
|
|
onlined_pages++;
|
|
}
|
|
*(unsigned long *)arg = onlined_pages;
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_MOVABLE_NODE
|
|
/*
|
|
* When CONFIG_MOVABLE_NODE, we permit onlining of a node which doesn't have
|
|
* normal memory.
|
|
*/
|
|
static bool can_online_high_movable(struct zone *zone)
|
|
{
|
|
return true;
|
|
}
|
|
#else /* CONFIG_MOVABLE_NODE */
|
|
/* ensure every online node has NORMAL memory */
|
|
static bool can_online_high_movable(struct zone *zone)
|
|
{
|
|
return node_state(zone_to_nid(zone), N_NORMAL_MEMORY);
|
|
}
|
|
#endif /* CONFIG_MOVABLE_NODE */
|
|
|
|
/* check which state of node_states will be changed when online memory */
|
|
static void node_states_check_changes_online(unsigned long nr_pages,
|
|
struct zone *zone, struct memory_notify *arg)
|
|
{
|
|
int nid = zone_to_nid(zone);
|
|
enum zone_type zone_last = ZONE_NORMAL;
|
|
|
|
/*
|
|
* If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY]
|
|
* contains nodes which have zones of 0...ZONE_NORMAL,
|
|
* set zone_last to ZONE_NORMAL.
|
|
*
|
|
* If we don't have HIGHMEM nor movable node,
|
|
* node_states[N_NORMAL_MEMORY] contains nodes which have zones of
|
|
* 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE.
|
|
*/
|
|
if (N_MEMORY == N_NORMAL_MEMORY)
|
|
zone_last = ZONE_MOVABLE;
|
|
|
|
/*
|
|
* if the memory to be online is in a zone of 0...zone_last, and
|
|
* the zones of 0...zone_last don't have memory before online, we will
|
|
* need to set the node to node_states[N_NORMAL_MEMORY] after
|
|
* the memory is online.
|
|
*/
|
|
if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY))
|
|
arg->status_change_nid_normal = nid;
|
|
else
|
|
arg->status_change_nid_normal = -1;
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
/*
|
|
* If we have movable node, node_states[N_HIGH_MEMORY]
|
|
* contains nodes which have zones of 0...ZONE_HIGHMEM,
|
|
* set zone_last to ZONE_HIGHMEM.
|
|
*
|
|
* If we don't have movable node, node_states[N_NORMAL_MEMORY]
|
|
* contains nodes which have zones of 0...ZONE_MOVABLE,
|
|
* set zone_last to ZONE_MOVABLE.
|
|
*/
|
|
zone_last = ZONE_HIGHMEM;
|
|
if (N_MEMORY == N_HIGH_MEMORY)
|
|
zone_last = ZONE_MOVABLE;
|
|
|
|
if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY))
|
|
arg->status_change_nid_high = nid;
|
|
else
|
|
arg->status_change_nid_high = -1;
|
|
#else
|
|
arg->status_change_nid_high = arg->status_change_nid_normal;
|
|
#endif
|
|
|
|
/*
|
|
* if the node don't have memory befor online, we will need to
|
|
* set the node to node_states[N_MEMORY] after the memory
|
|
* is online.
|
|
*/
|
|
if (!node_state(nid, N_MEMORY))
|
|
arg->status_change_nid = nid;
|
|
else
|
|
arg->status_change_nid = -1;
|
|
}
|
|
|
|
static void node_states_set_node(int node, struct memory_notify *arg)
|
|
{
|
|
if (arg->status_change_nid_normal >= 0)
|
|
node_set_state(node, N_NORMAL_MEMORY);
|
|
|
|
if (arg->status_change_nid_high >= 0)
|
|
node_set_state(node, N_HIGH_MEMORY);
|
|
|
|
node_set_state(node, N_MEMORY);
|
|
}
|
|
|
|
|
|
/* Must be protected by mem_hotplug_begin() */
|
|
int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type)
|
|
{
|
|
unsigned long flags;
|
|
unsigned long onlined_pages = 0;
|
|
struct zone *zone;
|
|
int need_zonelists_rebuild = 0;
|
|
int nid;
|
|
int ret;
|
|
struct memory_notify arg;
|
|
|
|
/*
|
|
* This doesn't need a lock to do pfn_to_page().
|
|
* The section can't be removed here because of the
|
|
* memory_block->state_mutex.
|
|
*/
|
|
zone = page_zone(pfn_to_page(pfn));
|
|
|
|
if ((zone_idx(zone) > ZONE_NORMAL ||
|
|
online_type == MMOP_ONLINE_MOVABLE) &&
|
|
!can_online_high_movable(zone))
|
|
return -EINVAL;
|
|
|
|
if (online_type == MMOP_ONLINE_KERNEL &&
|
|
zone_idx(zone) == ZONE_MOVABLE) {
|
|
if (move_pfn_range_left(zone - 1, zone, pfn, pfn + nr_pages))
|
|
return -EINVAL;
|
|
}
|
|
if (online_type == MMOP_ONLINE_MOVABLE &&
|
|
zone_idx(zone) == ZONE_MOVABLE - 1) {
|
|
if (move_pfn_range_right(zone, zone + 1, pfn, pfn + nr_pages))
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Previous code may changed the zone of the pfn range */
|
|
zone = page_zone(pfn_to_page(pfn));
|
|
|
|
arg.start_pfn = pfn;
|
|
arg.nr_pages = nr_pages;
|
|
node_states_check_changes_online(nr_pages, zone, &arg);
|
|
|
|
nid = pfn_to_nid(pfn);
|
|
|
|
ret = memory_notify(MEM_GOING_ONLINE, &arg);
|
|
ret = notifier_to_errno(ret);
|
|
if (ret) {
|
|
memory_notify(MEM_CANCEL_ONLINE, &arg);
|
|
return ret;
|
|
}
|
|
/*
|
|
* If this zone is not populated, then it is not in zonelist.
|
|
* This means the page allocator ignores this zone.
|
|
* So, zonelist must be updated after online.
|
|
*/
|
|
mutex_lock(&zonelists_mutex);
|
|
if (!populated_zone(zone)) {
|
|
need_zonelists_rebuild = 1;
|
|
build_all_zonelists(NULL, zone);
|
|
}
|
|
|
|
ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages,
|
|
online_pages_range);
|
|
if (ret) {
|
|
if (need_zonelists_rebuild)
|
|
zone_pcp_reset(zone);
|
|
mutex_unlock(&zonelists_mutex);
|
|
printk(KERN_DEBUG "online_pages [mem %#010llx-%#010llx] failed\n",
|
|
(unsigned long long) pfn << PAGE_SHIFT,
|
|
(((unsigned long long) pfn + nr_pages)
|
|
<< PAGE_SHIFT) - 1);
|
|
memory_notify(MEM_CANCEL_ONLINE, &arg);
|
|
return ret;
|
|
}
|
|
|
|
zone->present_pages += onlined_pages;
|
|
|
|
pgdat_resize_lock(zone->zone_pgdat, &flags);
|
|
zone->zone_pgdat->node_present_pages += onlined_pages;
|
|
pgdat_resize_unlock(zone->zone_pgdat, &flags);
|
|
|
|
if (onlined_pages) {
|
|
node_states_set_node(zone_to_nid(zone), &arg);
|
|
if (need_zonelists_rebuild)
|
|
build_all_zonelists(NULL, NULL);
|
|
else
|
|
zone_pcp_update(zone);
|
|
}
|
|
|
|
mutex_unlock(&zonelists_mutex);
|
|
|
|
init_per_zone_wmark_min();
|
|
|
|
if (onlined_pages)
|
|
kswapd_run(zone_to_nid(zone));
|
|
|
|
vm_total_pages = nr_free_pagecache_pages();
|
|
|
|
writeback_set_ratelimit();
|
|
|
|
if (onlined_pages)
|
|
memory_notify(MEM_ONLINE, &arg);
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
|
|
|
|
static void reset_node_present_pages(pg_data_t *pgdat)
|
|
{
|
|
struct zone *z;
|
|
|
|
for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
|
|
z->present_pages = 0;
|
|
|
|
pgdat->node_present_pages = 0;
|
|
}
|
|
|
|
/* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
|
|
static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start)
|
|
{
|
|
struct pglist_data *pgdat;
|
|
unsigned long zones_size[MAX_NR_ZONES] = {0};
|
|
unsigned long zholes_size[MAX_NR_ZONES] = {0};
|
|
unsigned long start_pfn = PFN_DOWN(start);
|
|
|
|
pgdat = NODE_DATA(nid);
|
|
if (!pgdat) {
|
|
pgdat = arch_alloc_nodedata(nid);
|
|
if (!pgdat)
|
|
return NULL;
|
|
|
|
arch_refresh_nodedata(nid, pgdat);
|
|
} else {
|
|
/* Reset the nr_zones and classzone_idx to 0 before reuse */
|
|
pgdat->nr_zones = 0;
|
|
pgdat->classzone_idx = 0;
|
|
}
|
|
|
|
/* we can use NODE_DATA(nid) from here */
|
|
|
|
/* init node's zones as empty zones, we don't have any present pages.*/
|
|
free_area_init_node(nid, zones_size, start_pfn, zholes_size);
|
|
|
|
/*
|
|
* The node we allocated has no zone fallback lists. For avoiding
|
|
* to access not-initialized zonelist, build here.
|
|
*/
|
|
mutex_lock(&zonelists_mutex);
|
|
build_all_zonelists(pgdat, NULL);
|
|
mutex_unlock(&zonelists_mutex);
|
|
|
|
/*
|
|
* zone->managed_pages is set to an approximate value in
|
|
* free_area_init_core(), which will cause
|
|
* /sys/device/system/node/nodeX/meminfo has wrong data.
|
|
* So reset it to 0 before any memory is onlined.
|
|
*/
|
|
reset_node_managed_pages(pgdat);
|
|
|
|
/*
|
|
* When memory is hot-added, all the memory is in offline state. So
|
|
* clear all zones' present_pages because they will be updated in
|
|
* online_pages() and offline_pages().
|
|
*/
|
|
reset_node_present_pages(pgdat);
|
|
|
|
return pgdat;
|
|
}
|
|
|
|
static void rollback_node_hotadd(int nid, pg_data_t *pgdat)
|
|
{
|
|
arch_refresh_nodedata(nid, NULL);
|
|
arch_free_nodedata(pgdat);
|
|
return;
|
|
}
|
|
|
|
|
|
/**
|
|
* try_online_node - online a node if offlined
|
|
*
|
|
* called by cpu_up() to online a node without onlined memory.
|
|
*/
|
|
int try_online_node(int nid)
|
|
{
|
|
pg_data_t *pgdat;
|
|
int ret;
|
|
|
|
if (node_online(nid))
|
|
return 0;
|
|
|
|
mem_hotplug_begin();
|
|
pgdat = hotadd_new_pgdat(nid, 0);
|
|
if (!pgdat) {
|
|
pr_err("Cannot online node %d due to NULL pgdat\n", nid);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
node_set_online(nid);
|
|
ret = register_one_node(nid);
|
|
BUG_ON(ret);
|
|
|
|
if (pgdat->node_zonelists->_zonerefs->zone == NULL) {
|
|
mutex_lock(&zonelists_mutex);
|
|
build_all_zonelists(NULL, NULL);
|
|
mutex_unlock(&zonelists_mutex);
|
|
}
|
|
|
|
out:
|
|
mem_hotplug_done();
|
|
return ret;
|
|
}
|
|
|
|
static int check_hotplug_memory_range(u64 start, u64 size)
|
|
{
|
|
u64 start_pfn = PFN_DOWN(start);
|
|
u64 nr_pages = size >> PAGE_SHIFT;
|
|
|
|
/* Memory range must be aligned with section */
|
|
if ((start_pfn & ~PAGE_SECTION_MASK) ||
|
|
(nr_pages % PAGES_PER_SECTION) || (!nr_pages)) {
|
|
pr_err("Section-unaligned hotplug range: start 0x%llx, size 0x%llx\n",
|
|
(unsigned long long)start,
|
|
(unsigned long long)size);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If movable zone has already been setup, newly added memory should be check.
|
|
* If its address is higher than movable zone, it should be added as movable.
|
|
* Without this check, movable zone may overlap with other zone.
|
|
*/
|
|
static int should_add_memory_movable(int nid, u64 start, u64 size)
|
|
{
|
|
unsigned long start_pfn = start >> PAGE_SHIFT;
|
|
pg_data_t *pgdat = NODE_DATA(nid);
|
|
struct zone *movable_zone = pgdat->node_zones + ZONE_MOVABLE;
|
|
|
|
if (zone_is_empty(movable_zone))
|
|
return 0;
|
|
|
|
if (movable_zone->zone_start_pfn <= start_pfn)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int zone_for_memory(int nid, u64 start, u64 size, int zone_default)
|
|
{
|
|
if (should_add_memory_movable(nid, start, size))
|
|
return ZONE_MOVABLE;
|
|
|
|
return zone_default;
|
|
}
|
|
|
|
/* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
|
|
int __ref add_memory(int nid, u64 start, u64 size)
|
|
{
|
|
pg_data_t *pgdat = NULL;
|
|
bool new_pgdat;
|
|
bool new_node;
|
|
struct resource *res;
|
|
int ret;
|
|
|
|
ret = check_hotplug_memory_range(start, size);
|
|
if (ret)
|
|
return ret;
|
|
|
|
res = register_memory_resource(start, size);
|
|
ret = -EEXIST;
|
|
if (!res)
|
|
return ret;
|
|
|
|
{ /* Stupid hack to suppress address-never-null warning */
|
|
void *p = NODE_DATA(nid);
|
|
new_pgdat = !p;
|
|
}
|
|
|
|
mem_hotplug_begin();
|
|
|
|
new_node = !node_online(nid);
|
|
if (new_node) {
|
|
pgdat = hotadd_new_pgdat(nid, start);
|
|
ret = -ENOMEM;
|
|
if (!pgdat)
|
|
goto error;
|
|
}
|
|
|
|
/* call arch's memory hotadd */
|
|
ret = arch_add_memory(nid, start, size);
|
|
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
/* we online node here. we can't roll back from here. */
|
|
node_set_online(nid);
|
|
|
|
if (new_node) {
|
|
ret = register_one_node(nid);
|
|
/*
|
|
* If sysfs file of new node can't create, cpu on the node
|
|
* can't be hot-added. There is no rollback way now.
|
|
* So, check by BUG_ON() to catch it reluctantly..
|
|
*/
|
|
BUG_ON(ret);
|
|
}
|
|
|
|
/* create new memmap entry */
|
|
firmware_map_add_hotplug(start, start + size, "System RAM");
|
|
|
|
goto out;
|
|
|
|
error:
|
|
/* rollback pgdat allocation and others */
|
|
if (new_pgdat)
|
|
rollback_node_hotadd(nid, pgdat);
|
|
release_memory_resource(res);
|
|
|
|
out:
|
|
mem_hotplug_done();
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(add_memory);
|
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
/*
|
|
* A free page on the buddy free lists (not the per-cpu lists) has PageBuddy
|
|
* set and the size of the free page is given by page_order(). Using this,
|
|
* the function determines if the pageblock contains only free pages.
|
|
* Due to buddy contraints, a free page at least the size of a pageblock will
|
|
* be located at the start of the pageblock
|
|
*/
|
|
static inline int pageblock_free(struct page *page)
|
|
{
|
|
return PageBuddy(page) && page_order(page) >= pageblock_order;
|
|
}
|
|
|
|
/* Return the start of the next active pageblock after a given page */
|
|
static struct page *next_active_pageblock(struct page *page)
|
|
{
|
|
/* Ensure the starting page is pageblock-aligned */
|
|
BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1));
|
|
|
|
/* If the entire pageblock is free, move to the end of free page */
|
|
if (pageblock_free(page)) {
|
|
int order;
|
|
/* be careful. we don't have locks, page_order can be changed.*/
|
|
order = page_order(page);
|
|
if ((order < MAX_ORDER) && (order >= pageblock_order))
|
|
return page + (1 << order);
|
|
}
|
|
|
|
return page + pageblock_nr_pages;
|
|
}
|
|
|
|
/* Checks if this range of memory is likely to be hot-removable. */
|
|
int is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages)
|
|
{
|
|
struct page *page = pfn_to_page(start_pfn);
|
|
struct page *end_page = page + nr_pages;
|
|
|
|
/* Check the starting page of each pageblock within the range */
|
|
for (; page < end_page; page = next_active_pageblock(page)) {
|
|
if (!is_pageblock_removable_nolock(page))
|
|
return 0;
|
|
cond_resched();
|
|
}
|
|
|
|
/* All pageblocks in the memory block are likely to be hot-removable */
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Confirm all pages in a range [start, end) is belongs to the same zone.
|
|
*/
|
|
int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn)
|
|
{
|
|
unsigned long pfn;
|
|
struct zone *zone = NULL;
|
|
struct page *page;
|
|
int i;
|
|
for (pfn = start_pfn;
|
|
pfn < end_pfn;
|
|
pfn += MAX_ORDER_NR_PAGES) {
|
|
i = 0;
|
|
/* This is just a CONFIG_HOLES_IN_ZONE check.*/
|
|
while ((i < MAX_ORDER_NR_PAGES) && !pfn_valid_within(pfn + i))
|
|
i++;
|
|
if (i == MAX_ORDER_NR_PAGES)
|
|
continue;
|
|
page = pfn_to_page(pfn + i);
|
|
if (zone && page_zone(page) != zone)
|
|
return 0;
|
|
zone = page_zone(page);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Scan pfn range [start,end) to find movable/migratable pages (LRU pages
|
|
* and hugepages). We scan pfn because it's much easier than scanning over
|
|
* linked list. This function returns the pfn of the first found movable
|
|
* page if it's found, otherwise 0.
|
|
*/
|
|
static unsigned long scan_movable_pages(unsigned long start, unsigned long end)
|
|
{
|
|
unsigned long pfn;
|
|
struct page *page;
|
|
for (pfn = start; pfn < end; pfn++) {
|
|
if (pfn_valid(pfn)) {
|
|
page = pfn_to_page(pfn);
|
|
if (PageLRU(page))
|
|
return pfn;
|
|
if (PageHuge(page)) {
|
|
if (page_huge_active(page))
|
|
return pfn;
|
|
else
|
|
pfn = round_up(pfn + 1,
|
|
1 << compound_order(page)) - 1;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#define NR_OFFLINE_AT_ONCE_PAGES (256)
|
|
static int
|
|
do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
|
|
{
|
|
unsigned long pfn;
|
|
struct page *page;
|
|
int move_pages = NR_OFFLINE_AT_ONCE_PAGES;
|
|
int not_managed = 0;
|
|
int ret = 0;
|
|
LIST_HEAD(source);
|
|
|
|
for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) {
|
|
if (!pfn_valid(pfn))
|
|
continue;
|
|
page = pfn_to_page(pfn);
|
|
|
|
if (PageHuge(page)) {
|
|
struct page *head = compound_head(page);
|
|
pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1;
|
|
if (compound_order(head) > PFN_SECTION_SHIFT) {
|
|
ret = -EBUSY;
|
|
break;
|
|
}
|
|
if (isolate_huge_page(page, &source))
|
|
move_pages -= 1 << compound_order(head);
|
|
continue;
|
|
}
|
|
|
|
if (!get_page_unless_zero(page))
|
|
continue;
|
|
/*
|
|
* We can skip free pages. And we can only deal with pages on
|
|
* LRU.
|
|
*/
|
|
ret = isolate_lru_page(page);
|
|
if (!ret) { /* Success */
|
|
put_page(page);
|
|
list_add_tail(&page->lru, &source);
|
|
move_pages--;
|
|
inc_zone_page_state(page, NR_ISOLATED_ANON +
|
|
page_is_file_cache(page));
|
|
|
|
} else {
|
|
#ifdef CONFIG_DEBUG_VM
|
|
printk(KERN_ALERT "removing pfn %lx from LRU failed\n",
|
|
pfn);
|
|
dump_page(page, "failed to remove from LRU");
|
|
#endif
|
|
put_page(page);
|
|
/* Because we don't have big zone->lock. we should
|
|
check this again here. */
|
|
if (page_count(page)) {
|
|
not_managed++;
|
|
ret = -EBUSY;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (!list_empty(&source)) {
|
|
if (not_managed) {
|
|
putback_movable_pages(&source);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* alloc_migrate_target should be improooooved!!
|
|
* migrate_pages returns # of failed pages.
|
|
*/
|
|
ret = migrate_pages(&source, alloc_migrate_target, NULL, 0,
|
|
MIGRATE_SYNC, MR_MEMORY_HOTPLUG);
|
|
if (ret)
|
|
putback_movable_pages(&source);
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* remove from free_area[] and mark all as Reserved.
|
|
*/
|
|
static int
|
|
offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages,
|
|
void *data)
|
|
{
|
|
__offline_isolated_pages(start, start + nr_pages);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
|
|
{
|
|
walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL,
|
|
offline_isolated_pages_cb);
|
|
}
|
|
|
|
/*
|
|
* Check all pages in range, recoreded as memory resource, are isolated.
|
|
*/
|
|
static int
|
|
check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages,
|
|
void *data)
|
|
{
|
|
int ret;
|
|
long offlined = *(long *)data;
|
|
ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true);
|
|
offlined = nr_pages;
|
|
if (!ret)
|
|
*(long *)data += offlined;
|
|
return ret;
|
|
}
|
|
|
|
static long
|
|
check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
|
|
{
|
|
long offlined = 0;
|
|
int ret;
|
|
|
|
ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined,
|
|
check_pages_isolated_cb);
|
|
if (ret < 0)
|
|
offlined = (long)ret;
|
|
return offlined;
|
|
}
|
|
|
|
#ifdef CONFIG_MOVABLE_NODE
|
|
/*
|
|
* When CONFIG_MOVABLE_NODE, we permit offlining of a node which doesn't have
|
|
* normal memory.
|
|
*/
|
|
static bool can_offline_normal(struct zone *zone, unsigned long nr_pages)
|
|
{
|
|
return true;
|
|
}
|
|
#else /* CONFIG_MOVABLE_NODE */
|
|
/* ensure the node has NORMAL memory if it is still online */
|
|
static bool can_offline_normal(struct zone *zone, unsigned long nr_pages)
|
|
{
|
|
struct pglist_data *pgdat = zone->zone_pgdat;
|
|
unsigned long present_pages = 0;
|
|
enum zone_type zt;
|
|
|
|
for (zt = 0; zt <= ZONE_NORMAL; zt++)
|
|
present_pages += pgdat->node_zones[zt].present_pages;
|
|
|
|
if (present_pages > nr_pages)
|
|
return true;
|
|
|
|
present_pages = 0;
|
|
for (; zt <= ZONE_MOVABLE; zt++)
|
|
present_pages += pgdat->node_zones[zt].present_pages;
|
|
|
|
/*
|
|
* we can't offline the last normal memory until all
|
|
* higher memory is offlined.
|
|
*/
|
|
return present_pages == 0;
|
|
}
|
|
#endif /* CONFIG_MOVABLE_NODE */
|
|
|
|
static int __init cmdline_parse_movable_node(char *p)
|
|
{
|
|
#ifdef CONFIG_MOVABLE_NODE
|
|
/*
|
|
* Memory used by the kernel cannot be hot-removed because Linux
|
|
* cannot migrate the kernel pages. When memory hotplug is
|
|
* enabled, we should prevent memblock from allocating memory
|
|
* for the kernel.
|
|
*
|
|
* ACPI SRAT records all hotpluggable memory ranges. But before
|
|
* SRAT is parsed, we don't know about it.
|
|
*
|
|
* The kernel image is loaded into memory at very early time. We
|
|
* cannot prevent this anyway. So on NUMA system, we set any
|
|
* node the kernel resides in as un-hotpluggable.
|
|
*
|
|
* Since on modern servers, one node could have double-digit
|
|
* gigabytes memory, we can assume the memory around the kernel
|
|
* image is also un-hotpluggable. So before SRAT is parsed, just
|
|
* allocate memory near the kernel image to try the best to keep
|
|
* the kernel away from hotpluggable memory.
|
|
*/
|
|
memblock_set_bottom_up(true);
|
|
movable_node_enabled = true;
|
|
#else
|
|
pr_warn("movable_node option not supported\n");
|
|
#endif
|
|
return 0;
|
|
}
|
|
early_param("movable_node", cmdline_parse_movable_node);
|
|
|
|
/* check which state of node_states will be changed when offline memory */
|
|
static void node_states_check_changes_offline(unsigned long nr_pages,
|
|
struct zone *zone, struct memory_notify *arg)
|
|
{
|
|
struct pglist_data *pgdat = zone->zone_pgdat;
|
|
unsigned long present_pages = 0;
|
|
enum zone_type zt, zone_last = ZONE_NORMAL;
|
|
|
|
/*
|
|
* If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY]
|
|
* contains nodes which have zones of 0...ZONE_NORMAL,
|
|
* set zone_last to ZONE_NORMAL.
|
|
*
|
|
* If we don't have HIGHMEM nor movable node,
|
|
* node_states[N_NORMAL_MEMORY] contains nodes which have zones of
|
|
* 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE.
|
|
*/
|
|
if (N_MEMORY == N_NORMAL_MEMORY)
|
|
zone_last = ZONE_MOVABLE;
|
|
|
|
/*
|
|
* check whether node_states[N_NORMAL_MEMORY] will be changed.
|
|
* If the memory to be offline is in a zone of 0...zone_last,
|
|
* and it is the last present memory, 0...zone_last will
|
|
* become empty after offline , thus we can determind we will
|
|
* need to clear the node from node_states[N_NORMAL_MEMORY].
|
|
*/
|
|
for (zt = 0; zt <= zone_last; zt++)
|
|
present_pages += pgdat->node_zones[zt].present_pages;
|
|
if (zone_idx(zone) <= zone_last && nr_pages >= present_pages)
|
|
arg->status_change_nid_normal = zone_to_nid(zone);
|
|
else
|
|
arg->status_change_nid_normal = -1;
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
/*
|
|
* If we have movable node, node_states[N_HIGH_MEMORY]
|
|
* contains nodes which have zones of 0...ZONE_HIGHMEM,
|
|
* set zone_last to ZONE_HIGHMEM.
|
|
*
|
|
* If we don't have movable node, node_states[N_NORMAL_MEMORY]
|
|
* contains nodes which have zones of 0...ZONE_MOVABLE,
|
|
* set zone_last to ZONE_MOVABLE.
|
|
*/
|
|
zone_last = ZONE_HIGHMEM;
|
|
if (N_MEMORY == N_HIGH_MEMORY)
|
|
zone_last = ZONE_MOVABLE;
|
|
|
|
for (; zt <= zone_last; zt++)
|
|
present_pages += pgdat->node_zones[zt].present_pages;
|
|
if (zone_idx(zone) <= zone_last && nr_pages >= present_pages)
|
|
arg->status_change_nid_high = zone_to_nid(zone);
|
|
else
|
|
arg->status_change_nid_high = -1;
|
|
#else
|
|
arg->status_change_nid_high = arg->status_change_nid_normal;
|
|
#endif
|
|
|
|
/*
|
|
* node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE
|
|
*/
|
|
zone_last = ZONE_MOVABLE;
|
|
|
|
/*
|
|
* check whether node_states[N_HIGH_MEMORY] will be changed
|
|
* If we try to offline the last present @nr_pages from the node,
|
|
* we can determind we will need to clear the node from
|
|
* node_states[N_HIGH_MEMORY].
|
|
*/
|
|
for (; zt <= zone_last; zt++)
|
|
present_pages += pgdat->node_zones[zt].present_pages;
|
|
if (nr_pages >= present_pages)
|
|
arg->status_change_nid = zone_to_nid(zone);
|
|
else
|
|
arg->status_change_nid = -1;
|
|
}
|
|
|
|
static void node_states_clear_node(int node, struct memory_notify *arg)
|
|
{
|
|
if (arg->status_change_nid_normal >= 0)
|
|
node_clear_state(node, N_NORMAL_MEMORY);
|
|
|
|
if ((N_MEMORY != N_NORMAL_MEMORY) &&
|
|
(arg->status_change_nid_high >= 0))
|
|
node_clear_state(node, N_HIGH_MEMORY);
|
|
|
|
if ((N_MEMORY != N_HIGH_MEMORY) &&
|
|
(arg->status_change_nid >= 0))
|
|
node_clear_state(node, N_MEMORY);
|
|
}
|
|
|
|
static int __ref __offline_pages(unsigned long start_pfn,
|
|
unsigned long end_pfn, unsigned long timeout)
|
|
{
|
|
unsigned long pfn, nr_pages, expire;
|
|
long offlined_pages;
|
|
int ret, drain, retry_max, node;
|
|
unsigned long flags;
|
|
struct zone *zone;
|
|
struct memory_notify arg;
|
|
|
|
/* at least, alignment against pageblock is necessary */
|
|
if (!IS_ALIGNED(start_pfn, pageblock_nr_pages))
|
|
return -EINVAL;
|
|
if (!IS_ALIGNED(end_pfn, pageblock_nr_pages))
|
|
return -EINVAL;
|
|
/* This makes hotplug much easier...and readable.
|
|
we assume this for now. .*/
|
|
if (!test_pages_in_a_zone(start_pfn, end_pfn))
|
|
return -EINVAL;
|
|
|
|
zone = page_zone(pfn_to_page(start_pfn));
|
|
node = zone_to_nid(zone);
|
|
nr_pages = end_pfn - start_pfn;
|
|
|
|
if (zone_idx(zone) <= ZONE_NORMAL && !can_offline_normal(zone, nr_pages))
|
|
return -EINVAL;
|
|
|
|
/* set above range as isolated */
|
|
ret = start_isolate_page_range(start_pfn, end_pfn,
|
|
MIGRATE_MOVABLE, true);
|
|
if (ret)
|
|
return ret;
|
|
|
|
arg.start_pfn = start_pfn;
|
|
arg.nr_pages = nr_pages;
|
|
node_states_check_changes_offline(nr_pages, zone, &arg);
|
|
|
|
ret = memory_notify(MEM_GOING_OFFLINE, &arg);
|
|
ret = notifier_to_errno(ret);
|
|
if (ret)
|
|
goto failed_removal;
|
|
|
|
pfn = start_pfn;
|
|
expire = jiffies + timeout;
|
|
drain = 0;
|
|
retry_max = 5;
|
|
repeat:
|
|
/* start memory hot removal */
|
|
ret = -EAGAIN;
|
|
if (time_after(jiffies, expire))
|
|
goto failed_removal;
|
|
ret = -EINTR;
|
|
if (signal_pending(current))
|
|
goto failed_removal;
|
|
ret = 0;
|
|
if (drain) {
|
|
lru_add_drain_all();
|
|
cond_resched();
|
|
drain_all_pages(zone);
|
|
}
|
|
|
|
pfn = scan_movable_pages(start_pfn, end_pfn);
|
|
if (pfn) { /* We have movable pages */
|
|
ret = do_migrate_range(pfn, end_pfn);
|
|
if (!ret) {
|
|
drain = 1;
|
|
goto repeat;
|
|
} else {
|
|
if (ret < 0)
|
|
if (--retry_max == 0)
|
|
goto failed_removal;
|
|
yield();
|
|
drain = 1;
|
|
goto repeat;
|
|
}
|
|
}
|
|
/* drain all zone's lru pagevec, this is asynchronous... */
|
|
lru_add_drain_all();
|
|
yield();
|
|
/* drain pcp pages, this is synchronous. */
|
|
drain_all_pages(zone);
|
|
/*
|
|
* dissolve free hugepages in the memory block before doing offlining
|
|
* actually in order to make hugetlbfs's object counting consistent.
|
|
*/
|
|
dissolve_free_huge_pages(start_pfn, end_pfn);
|
|
/* check again */
|
|
offlined_pages = check_pages_isolated(start_pfn, end_pfn);
|
|
if (offlined_pages < 0) {
|
|
ret = -EBUSY;
|
|
goto failed_removal;
|
|
}
|
|
printk(KERN_INFO "Offlined Pages %ld\n", offlined_pages);
|
|
/* Ok, all of our target is isolated.
|
|
We cannot do rollback at this point. */
|
|
offline_isolated_pages(start_pfn, end_pfn);
|
|
/* reset pagetype flags and makes migrate type to be MOVABLE */
|
|
undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
|
|
/* removal success */
|
|
adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages);
|
|
zone->present_pages -= offlined_pages;
|
|
|
|
pgdat_resize_lock(zone->zone_pgdat, &flags);
|
|
zone->zone_pgdat->node_present_pages -= offlined_pages;
|
|
pgdat_resize_unlock(zone->zone_pgdat, &flags);
|
|
|
|
init_per_zone_wmark_min();
|
|
|
|
if (!populated_zone(zone)) {
|
|
zone_pcp_reset(zone);
|
|
mutex_lock(&zonelists_mutex);
|
|
build_all_zonelists(NULL, NULL);
|
|
mutex_unlock(&zonelists_mutex);
|
|
} else
|
|
zone_pcp_update(zone);
|
|
|
|
node_states_clear_node(node, &arg);
|
|
if (arg.status_change_nid >= 0)
|
|
kswapd_stop(node);
|
|
|
|
vm_total_pages = nr_free_pagecache_pages();
|
|
writeback_set_ratelimit();
|
|
|
|
memory_notify(MEM_OFFLINE, &arg);
|
|
return 0;
|
|
|
|
failed_removal:
|
|
printk(KERN_INFO "memory offlining [mem %#010llx-%#010llx] failed\n",
|
|
(unsigned long long) start_pfn << PAGE_SHIFT,
|
|
((unsigned long long) end_pfn << PAGE_SHIFT) - 1);
|
|
memory_notify(MEM_CANCEL_OFFLINE, &arg);
|
|
/* pushback to free area */
|
|
undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
|
|
return ret;
|
|
}
|
|
|
|
/* Must be protected by mem_hotplug_begin() */
|
|
int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
|
|
{
|
|
return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ);
|
|
}
|
|
#endif /* CONFIG_MEMORY_HOTREMOVE */
|
|
|
|
/**
|
|
* walk_memory_range - walks through all mem sections in [start_pfn, end_pfn)
|
|
* @start_pfn: start pfn of the memory range
|
|
* @end_pfn: end pfn of the memory range
|
|
* @arg: argument passed to func
|
|
* @func: callback for each memory section walked
|
|
*
|
|
* This function walks through all present mem sections in range
|
|
* [start_pfn, end_pfn) and call func on each mem section.
|
|
*
|
|
* Returns the return value of func.
|
|
*/
|
|
int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
|
|
void *arg, int (*func)(struct memory_block *, void *))
|
|
{
|
|
struct memory_block *mem = NULL;
|
|
struct mem_section *section;
|
|
unsigned long pfn, section_nr;
|
|
int ret;
|
|
|
|
for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
|
|
section_nr = pfn_to_section_nr(pfn);
|
|
if (!present_section_nr(section_nr))
|
|
continue;
|
|
|
|
section = __nr_to_section(section_nr);
|
|
/* same memblock? */
|
|
if (mem)
|
|
if ((section_nr >= mem->start_section_nr) &&
|
|
(section_nr <= mem->end_section_nr))
|
|
continue;
|
|
|
|
mem = find_memory_block_hinted(section, mem);
|
|
if (!mem)
|
|
continue;
|
|
|
|
ret = func(mem, arg);
|
|
if (ret) {
|
|
kobject_put(&mem->dev.kobj);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (mem)
|
|
kobject_put(&mem->dev.kobj);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
static int check_memblock_offlined_cb(struct memory_block *mem, void *arg)
|
|
{
|
|
int ret = !is_memblock_offlined(mem);
|
|
|
|
if (unlikely(ret)) {
|
|
phys_addr_t beginpa, endpa;
|
|
|
|
beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr));
|
|
endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1;
|
|
pr_warn("removing memory fails, because memory "
|
|
"[%pa-%pa] is onlined\n",
|
|
&beginpa, &endpa);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int check_cpu_on_node(pg_data_t *pgdat)
|
|
{
|
|
int cpu;
|
|
|
|
for_each_present_cpu(cpu) {
|
|
if (cpu_to_node(cpu) == pgdat->node_id)
|
|
/*
|
|
* the cpu on this node isn't removed, and we can't
|
|
* offline this node.
|
|
*/
|
|
return -EBUSY;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void unmap_cpu_on_node(pg_data_t *pgdat)
|
|
{
|
|
#ifdef CONFIG_ACPI_NUMA
|
|
int cpu;
|
|
|
|
for_each_possible_cpu(cpu)
|
|
if (cpu_to_node(cpu) == pgdat->node_id)
|
|
numa_clear_node(cpu);
|
|
#endif
|
|
}
|
|
|
|
static int check_and_unmap_cpu_on_node(pg_data_t *pgdat)
|
|
{
|
|
int ret;
|
|
|
|
ret = check_cpu_on_node(pgdat);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* the node will be offlined when we come here, so we can clear
|
|
* the cpu_to_node() now.
|
|
*/
|
|
|
|
unmap_cpu_on_node(pgdat);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* try_offline_node
|
|
*
|
|
* Offline a node if all memory sections and cpus of the node are removed.
|
|
*
|
|
* NOTE: The caller must call lock_device_hotplug() to serialize hotplug
|
|
* and online/offline operations before this call.
|
|
*/
|
|
void try_offline_node(int nid)
|
|
{
|
|
pg_data_t *pgdat = NODE_DATA(nid);
|
|
unsigned long start_pfn = pgdat->node_start_pfn;
|
|
unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
|
|
unsigned long pfn;
|
|
int i;
|
|
|
|
for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
|
|
unsigned long section_nr = pfn_to_section_nr(pfn);
|
|
|
|
if (!present_section_nr(section_nr))
|
|
continue;
|
|
|
|
if (pfn_to_nid(pfn) != nid)
|
|
continue;
|
|
|
|
/*
|
|
* some memory sections of this node are not removed, and we
|
|
* can't offline node now.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
if (check_and_unmap_cpu_on_node(pgdat))
|
|
return;
|
|
|
|
/*
|
|
* all memory/cpu of this node are removed, we can offline this
|
|
* node now.
|
|
*/
|
|
node_set_offline(nid);
|
|
unregister_one_node(nid);
|
|
|
|
/* free waittable in each zone */
|
|
for (i = 0; i < MAX_NR_ZONES; i++) {
|
|
struct zone *zone = pgdat->node_zones + i;
|
|
|
|
/*
|
|
* wait_table may be allocated from boot memory,
|
|
* here only free if it's allocated by vmalloc.
|
|
*/
|
|
if (is_vmalloc_addr(zone->wait_table))
|
|
vfree(zone->wait_table);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(try_offline_node);
|
|
|
|
/**
|
|
* remove_memory
|
|
*
|
|
* NOTE: The caller must call lock_device_hotplug() to serialize hotplug
|
|
* and online/offline operations before this call, as required by
|
|
* try_offline_node().
|
|
*/
|
|
void __ref remove_memory(int nid, u64 start, u64 size)
|
|
{
|
|
int ret;
|
|
|
|
BUG_ON(check_hotplug_memory_range(start, size));
|
|
|
|
mem_hotplug_begin();
|
|
|
|
/*
|
|
* All memory blocks must be offlined before removing memory. Check
|
|
* whether all memory blocks in question are offline and trigger a BUG()
|
|
* if this is not the case.
|
|
*/
|
|
ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL,
|
|
check_memblock_offlined_cb);
|
|
if (ret)
|
|
BUG();
|
|
|
|
/* remove memmap entry */
|
|
firmware_map_remove(start, start + size, "System RAM");
|
|
|
|
arch_remove_memory(start, size);
|
|
|
|
try_offline_node(nid);
|
|
|
|
mem_hotplug_done();
|
|
}
|
|
EXPORT_SYMBOL_GPL(remove_memory);
|
|
#endif /* CONFIG_MEMORY_HOTREMOVE */
|