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![Paul E. McKenney](/assets/img/avatar_default.png)
The mem_dump_obj() functionality adds a few hundred bytes, which is a small price to pay. Except on kernels built with CONFIG_PRINTK=n, in which mem_dump_obj() messages will be suppressed. This commit therefore makes mem_dump_obj() be a static inline empty function on kernels built with CONFIG_PRINTK=n and excludes all of its support functions as well. This avoids kernel bloat on systems that cannot use mem_dump_obj(). Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: <linux-mm@kvack.org> Suggested-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
726 lines
18 KiB
C
726 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* SLOB Allocator: Simple List Of Blocks
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*
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* Matt Mackall <mpm@selenic.com> 12/30/03
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*
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* NUMA support by Paul Mundt, 2007.
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*
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* How SLOB works:
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*
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* The core of SLOB is a traditional K&R style heap allocator, with
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* support for returning aligned objects. The granularity of this
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* allocator is as little as 2 bytes, however typically most architectures
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* will require 4 bytes on 32-bit and 8 bytes on 64-bit.
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*
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* The slob heap is a set of linked list of pages from alloc_pages(),
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* and within each page, there is a singly-linked list of free blocks
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* (slob_t). The heap is grown on demand. To reduce fragmentation,
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* heap pages are segregated into three lists, with objects less than
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* 256 bytes, objects less than 1024 bytes, and all other objects.
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*
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* Allocation from heap involves first searching for a page with
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* sufficient free blocks (using a next-fit-like approach) followed by
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* a first-fit scan of the page. Deallocation inserts objects back
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* into the free list in address order, so this is effectively an
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* address-ordered first fit.
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*
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* Above this is an implementation of kmalloc/kfree. Blocks returned
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* from kmalloc are prepended with a 4-byte header with the kmalloc size.
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* If kmalloc is asked for objects of PAGE_SIZE or larger, it calls
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* alloc_pages() directly, allocating compound pages so the page order
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* does not have to be separately tracked.
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* These objects are detected in kfree() because PageSlab()
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* is false for them.
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*
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* SLAB is emulated on top of SLOB by simply calling constructors and
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* destructors for every SLAB allocation. Objects are returned with the
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* 4-byte alignment unless the SLAB_HWCACHE_ALIGN flag is set, in which
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* case the low-level allocator will fragment blocks to create the proper
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* alignment. Again, objects of page-size or greater are allocated by
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* calling alloc_pages(). As SLAB objects know their size, no separate
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* size bookkeeping is necessary and there is essentially no allocation
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* space overhead, and compound pages aren't needed for multi-page
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* allocations.
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*
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* NUMA support in SLOB is fairly simplistic, pushing most of the real
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* logic down to the page allocator, and simply doing the node accounting
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* on the upper levels. In the event that a node id is explicitly
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* provided, __alloc_pages_node() with the specified node id is used
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* instead. The common case (or when the node id isn't explicitly provided)
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* will default to the current node, as per numa_node_id().
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*
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* Node aware pages are still inserted in to the global freelist, and
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* these are scanned for by matching against the node id encoded in the
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* page flags. As a result, block allocations that can be satisfied from
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* the freelist will only be done so on pages residing on the same node,
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* in order to prevent random node placement.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/swap.h> /* struct reclaim_state */
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#include <linux/cache.h>
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/rcupdate.h>
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#include <linux/list.h>
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#include <linux/kmemleak.h>
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#include <trace/events/kmem.h>
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#include <linux/atomic.h>
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#include "slab.h"
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/*
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* slob_block has a field 'units', which indicates size of block if +ve,
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* or offset of next block if -ve (in SLOB_UNITs).
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*
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* Free blocks of size 1 unit simply contain the offset of the next block.
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* Those with larger size contain their size in the first SLOB_UNIT of
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* memory, and the offset of the next free block in the second SLOB_UNIT.
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*/
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#if PAGE_SIZE <= (32767 * 2)
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typedef s16 slobidx_t;
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#else
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typedef s32 slobidx_t;
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#endif
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struct slob_block {
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slobidx_t units;
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};
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typedef struct slob_block slob_t;
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/*
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* All partially free slob pages go on these lists.
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*/
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#define SLOB_BREAK1 256
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#define SLOB_BREAK2 1024
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static LIST_HEAD(free_slob_small);
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static LIST_HEAD(free_slob_medium);
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static LIST_HEAD(free_slob_large);
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/*
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* slob_page_free: true for pages on free_slob_pages list.
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*/
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static inline int slob_page_free(struct page *sp)
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{
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return PageSlobFree(sp);
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}
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static void set_slob_page_free(struct page *sp, struct list_head *list)
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{
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list_add(&sp->slab_list, list);
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__SetPageSlobFree(sp);
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}
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static inline void clear_slob_page_free(struct page *sp)
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{
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list_del(&sp->slab_list);
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__ClearPageSlobFree(sp);
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}
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#define SLOB_UNIT sizeof(slob_t)
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#define SLOB_UNITS(size) DIV_ROUND_UP(size, SLOB_UNIT)
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/*
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* struct slob_rcu is inserted at the tail of allocated slob blocks, which
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* were created with a SLAB_TYPESAFE_BY_RCU slab. slob_rcu is used to free
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* the block using call_rcu.
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*/
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struct slob_rcu {
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struct rcu_head head;
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int size;
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};
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/*
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* slob_lock protects all slob allocator structures.
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*/
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static DEFINE_SPINLOCK(slob_lock);
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/*
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* Encode the given size and next info into a free slob block s.
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*/
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static void set_slob(slob_t *s, slobidx_t size, slob_t *next)
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{
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slob_t *base = (slob_t *)((unsigned long)s & PAGE_MASK);
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slobidx_t offset = next - base;
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if (size > 1) {
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s[0].units = size;
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s[1].units = offset;
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} else
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s[0].units = -offset;
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}
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/*
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* Return the size of a slob block.
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*/
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static slobidx_t slob_units(slob_t *s)
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{
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if (s->units > 0)
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return s->units;
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return 1;
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}
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/*
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* Return the next free slob block pointer after this one.
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*/
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static slob_t *slob_next(slob_t *s)
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{
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slob_t *base = (slob_t *)((unsigned long)s & PAGE_MASK);
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slobidx_t next;
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if (s[0].units < 0)
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next = -s[0].units;
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else
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next = s[1].units;
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return base+next;
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}
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/*
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* Returns true if s is the last free block in its page.
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*/
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static int slob_last(slob_t *s)
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{
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return !((unsigned long)slob_next(s) & ~PAGE_MASK);
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}
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static void *slob_new_pages(gfp_t gfp, int order, int node)
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{
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struct page *page;
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#ifdef CONFIG_NUMA
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if (node != NUMA_NO_NODE)
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page = __alloc_pages_node(node, gfp, order);
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else
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#endif
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page = alloc_pages(gfp, order);
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if (!page)
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return NULL;
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mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE_B,
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PAGE_SIZE << order);
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return page_address(page);
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}
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static void slob_free_pages(void *b, int order)
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{
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struct page *sp = virt_to_page(b);
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if (current->reclaim_state)
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current->reclaim_state->reclaimed_slab += 1 << order;
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mod_node_page_state(page_pgdat(sp), NR_SLAB_UNRECLAIMABLE_B,
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-(PAGE_SIZE << order));
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__free_pages(sp, order);
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}
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/*
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* slob_page_alloc() - Allocate a slob block within a given slob_page sp.
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* @sp: Page to look in.
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* @size: Size of the allocation.
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* @align: Allocation alignment.
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* @align_offset: Offset in the allocated block that will be aligned.
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* @page_removed_from_list: Return parameter.
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*
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* Tries to find a chunk of memory at least @size bytes big within @page.
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*
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* Return: Pointer to memory if allocated, %NULL otherwise. If the
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* allocation fills up @page then the page is removed from the
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* freelist, in this case @page_removed_from_list will be set to
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* true (set to false otherwise).
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*/
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static void *slob_page_alloc(struct page *sp, size_t size, int align,
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int align_offset, bool *page_removed_from_list)
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{
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slob_t *prev, *cur, *aligned = NULL;
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int delta = 0, units = SLOB_UNITS(size);
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*page_removed_from_list = false;
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for (prev = NULL, cur = sp->freelist; ; prev = cur, cur = slob_next(cur)) {
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slobidx_t avail = slob_units(cur);
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/*
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* 'aligned' will hold the address of the slob block so that the
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* address 'aligned'+'align_offset' is aligned according to the
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* 'align' parameter. This is for kmalloc() which prepends the
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* allocated block with its size, so that the block itself is
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* aligned when needed.
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*/
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if (align) {
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aligned = (slob_t *)
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(ALIGN((unsigned long)cur + align_offset, align)
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- align_offset);
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delta = aligned - cur;
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}
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if (avail >= units + delta) { /* room enough? */
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slob_t *next;
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if (delta) { /* need to fragment head to align? */
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next = slob_next(cur);
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set_slob(aligned, avail - delta, next);
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set_slob(cur, delta, aligned);
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prev = cur;
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cur = aligned;
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avail = slob_units(cur);
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}
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next = slob_next(cur);
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if (avail == units) { /* exact fit? unlink. */
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if (prev)
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set_slob(prev, slob_units(prev), next);
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else
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sp->freelist = next;
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} else { /* fragment */
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if (prev)
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set_slob(prev, slob_units(prev), cur + units);
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else
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sp->freelist = cur + units;
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set_slob(cur + units, avail - units, next);
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}
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sp->units -= units;
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if (!sp->units) {
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clear_slob_page_free(sp);
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*page_removed_from_list = true;
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}
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return cur;
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}
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if (slob_last(cur))
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return NULL;
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}
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}
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/*
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* slob_alloc: entry point into the slob allocator.
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*/
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static void *slob_alloc(size_t size, gfp_t gfp, int align, int node,
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int align_offset)
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{
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struct page *sp;
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struct list_head *slob_list;
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slob_t *b = NULL;
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unsigned long flags;
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bool _unused;
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if (size < SLOB_BREAK1)
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slob_list = &free_slob_small;
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else if (size < SLOB_BREAK2)
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slob_list = &free_slob_medium;
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else
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slob_list = &free_slob_large;
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spin_lock_irqsave(&slob_lock, flags);
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/* Iterate through each partially free page, try to find room */
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list_for_each_entry(sp, slob_list, slab_list) {
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bool page_removed_from_list = false;
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#ifdef CONFIG_NUMA
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/*
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* If there's a node specification, search for a partial
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* page with a matching node id in the freelist.
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*/
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if (node != NUMA_NO_NODE && page_to_nid(sp) != node)
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continue;
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#endif
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/* Enough room on this page? */
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if (sp->units < SLOB_UNITS(size))
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continue;
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b = slob_page_alloc(sp, size, align, align_offset, &page_removed_from_list);
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if (!b)
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continue;
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/*
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* If slob_page_alloc() removed sp from the list then we
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* cannot call list functions on sp. If so allocation
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* did not fragment the page anyway so optimisation is
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* unnecessary.
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*/
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if (!page_removed_from_list) {
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/*
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* Improve fragment distribution and reduce our average
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* search time by starting our next search here. (see
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* Knuth vol 1, sec 2.5, pg 449)
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*/
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if (!list_is_first(&sp->slab_list, slob_list))
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list_rotate_to_front(&sp->slab_list, slob_list);
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}
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break;
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}
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spin_unlock_irqrestore(&slob_lock, flags);
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/* Not enough space: must allocate a new page */
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if (!b) {
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b = slob_new_pages(gfp & ~__GFP_ZERO, 0, node);
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if (!b)
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return NULL;
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sp = virt_to_page(b);
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__SetPageSlab(sp);
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spin_lock_irqsave(&slob_lock, flags);
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sp->units = SLOB_UNITS(PAGE_SIZE);
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sp->freelist = b;
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INIT_LIST_HEAD(&sp->slab_list);
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set_slob(b, SLOB_UNITS(PAGE_SIZE), b + SLOB_UNITS(PAGE_SIZE));
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set_slob_page_free(sp, slob_list);
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b = slob_page_alloc(sp, size, align, align_offset, &_unused);
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BUG_ON(!b);
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spin_unlock_irqrestore(&slob_lock, flags);
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}
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if (unlikely(gfp & __GFP_ZERO))
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memset(b, 0, size);
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return b;
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}
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/*
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* slob_free: entry point into the slob allocator.
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*/
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static void slob_free(void *block, int size)
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{
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struct page *sp;
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slob_t *prev, *next, *b = (slob_t *)block;
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slobidx_t units;
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unsigned long flags;
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struct list_head *slob_list;
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if (unlikely(ZERO_OR_NULL_PTR(block)))
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return;
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BUG_ON(!size);
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sp = virt_to_page(block);
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units = SLOB_UNITS(size);
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spin_lock_irqsave(&slob_lock, flags);
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if (sp->units + units == SLOB_UNITS(PAGE_SIZE)) {
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/* Go directly to page allocator. Do not pass slob allocator */
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if (slob_page_free(sp))
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clear_slob_page_free(sp);
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spin_unlock_irqrestore(&slob_lock, flags);
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__ClearPageSlab(sp);
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page_mapcount_reset(sp);
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slob_free_pages(b, 0);
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return;
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}
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if (!slob_page_free(sp)) {
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/* This slob page is about to become partially free. Easy! */
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sp->units = units;
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sp->freelist = b;
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set_slob(b, units,
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(void *)((unsigned long)(b +
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SLOB_UNITS(PAGE_SIZE)) & PAGE_MASK));
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if (size < SLOB_BREAK1)
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slob_list = &free_slob_small;
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else if (size < SLOB_BREAK2)
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slob_list = &free_slob_medium;
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else
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slob_list = &free_slob_large;
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set_slob_page_free(sp, slob_list);
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goto out;
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}
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/*
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* Otherwise the page is already partially free, so find reinsertion
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* point.
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*/
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sp->units += units;
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if (b < (slob_t *)sp->freelist) {
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if (b + units == sp->freelist) {
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units += slob_units(sp->freelist);
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sp->freelist = slob_next(sp->freelist);
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}
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set_slob(b, units, sp->freelist);
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sp->freelist = b;
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} else {
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prev = sp->freelist;
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next = slob_next(prev);
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while (b > next) {
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prev = next;
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next = slob_next(prev);
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}
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if (!slob_last(prev) && b + units == next) {
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units += slob_units(next);
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set_slob(b, units, slob_next(next));
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} else
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set_slob(b, units, next);
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if (prev + slob_units(prev) == b) {
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units = slob_units(b) + slob_units(prev);
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set_slob(prev, units, slob_next(b));
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} else
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set_slob(prev, slob_units(prev), b);
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}
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out:
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spin_unlock_irqrestore(&slob_lock, flags);
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}
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#ifdef CONFIG_PRINTK
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void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct page *page)
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{
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kpp->kp_ptr = object;
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kpp->kp_page = page;
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}
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#endif
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/*
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* End of slob allocator proper. Begin kmem_cache_alloc and kmalloc frontend.
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*/
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static __always_inline void *
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__do_kmalloc_node(size_t size, gfp_t gfp, int node, unsigned long caller)
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{
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unsigned int *m;
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int minalign = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
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void *ret;
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gfp &= gfp_allowed_mask;
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might_alloc(gfp);
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if (size < PAGE_SIZE - minalign) {
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int align = minalign;
|
|
|
|
/*
|
|
* For power of two sizes, guarantee natural alignment for
|
|
* kmalloc()'d objects.
|
|
*/
|
|
if (is_power_of_2(size))
|
|
align = max(minalign, (int) size);
|
|
|
|
if (!size)
|
|
return ZERO_SIZE_PTR;
|
|
|
|
m = slob_alloc(size + minalign, gfp, align, node, minalign);
|
|
|
|
if (!m)
|
|
return NULL;
|
|
*m = size;
|
|
ret = (void *)m + minalign;
|
|
|
|
trace_kmalloc_node(caller, ret,
|
|
size, size + minalign, gfp, node);
|
|
} else {
|
|
unsigned int order = get_order(size);
|
|
|
|
if (likely(order))
|
|
gfp |= __GFP_COMP;
|
|
ret = slob_new_pages(gfp, order, node);
|
|
|
|
trace_kmalloc_node(caller, ret,
|
|
size, PAGE_SIZE << order, gfp, node);
|
|
}
|
|
|
|
kmemleak_alloc(ret, size, 1, gfp);
|
|
return ret;
|
|
}
|
|
|
|
void *__kmalloc(size_t size, gfp_t gfp)
|
|
{
|
|
return __do_kmalloc_node(size, gfp, NUMA_NO_NODE, _RET_IP_);
|
|
}
|
|
EXPORT_SYMBOL(__kmalloc);
|
|
|
|
void *__kmalloc_track_caller(size_t size, gfp_t gfp, unsigned long caller)
|
|
{
|
|
return __do_kmalloc_node(size, gfp, NUMA_NO_NODE, caller);
|
|
}
|
|
EXPORT_SYMBOL(__kmalloc_track_caller);
|
|
|
|
#ifdef CONFIG_NUMA
|
|
void *__kmalloc_node_track_caller(size_t size, gfp_t gfp,
|
|
int node, unsigned long caller)
|
|
{
|
|
return __do_kmalloc_node(size, gfp, node, caller);
|
|
}
|
|
EXPORT_SYMBOL(__kmalloc_node_track_caller);
|
|
#endif
|
|
|
|
void kfree(const void *block)
|
|
{
|
|
struct page *sp;
|
|
|
|
trace_kfree(_RET_IP_, block);
|
|
|
|
if (unlikely(ZERO_OR_NULL_PTR(block)))
|
|
return;
|
|
kmemleak_free(block);
|
|
|
|
sp = virt_to_page(block);
|
|
if (PageSlab(sp)) {
|
|
int align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
|
|
unsigned int *m = (unsigned int *)(block - align);
|
|
slob_free(m, *m + align);
|
|
} else {
|
|
unsigned int order = compound_order(sp);
|
|
mod_node_page_state(page_pgdat(sp), NR_SLAB_UNRECLAIMABLE_B,
|
|
-(PAGE_SIZE << order));
|
|
__free_pages(sp, order);
|
|
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(kfree);
|
|
|
|
/* can't use ksize for kmem_cache_alloc memory, only kmalloc */
|
|
size_t __ksize(const void *block)
|
|
{
|
|
struct page *sp;
|
|
int align;
|
|
unsigned int *m;
|
|
|
|
BUG_ON(!block);
|
|
if (unlikely(block == ZERO_SIZE_PTR))
|
|
return 0;
|
|
|
|
sp = virt_to_page(block);
|
|
if (unlikely(!PageSlab(sp)))
|
|
return page_size(sp);
|
|
|
|
align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
|
|
m = (unsigned int *)(block - align);
|
|
return SLOB_UNITS(*m) * SLOB_UNIT;
|
|
}
|
|
EXPORT_SYMBOL(__ksize);
|
|
|
|
int __kmem_cache_create(struct kmem_cache *c, slab_flags_t flags)
|
|
{
|
|
if (flags & SLAB_TYPESAFE_BY_RCU) {
|
|
/* leave room for rcu footer at the end of object */
|
|
c->size += sizeof(struct slob_rcu);
|
|
}
|
|
c->flags = flags;
|
|
return 0;
|
|
}
|
|
|
|
static void *slob_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
|
|
{
|
|
void *b;
|
|
|
|
flags &= gfp_allowed_mask;
|
|
|
|
might_alloc(flags);
|
|
|
|
if (c->size < PAGE_SIZE) {
|
|
b = slob_alloc(c->size, flags, c->align, node, 0);
|
|
trace_kmem_cache_alloc_node(_RET_IP_, b, c->object_size,
|
|
SLOB_UNITS(c->size) * SLOB_UNIT,
|
|
flags, node);
|
|
} else {
|
|
b = slob_new_pages(flags, get_order(c->size), node);
|
|
trace_kmem_cache_alloc_node(_RET_IP_, b, c->object_size,
|
|
PAGE_SIZE << get_order(c->size),
|
|
flags, node);
|
|
}
|
|
|
|
if (b && c->ctor) {
|
|
WARN_ON_ONCE(flags & __GFP_ZERO);
|
|
c->ctor(b);
|
|
}
|
|
|
|
kmemleak_alloc_recursive(b, c->size, 1, c->flags, flags);
|
|
return b;
|
|
}
|
|
|
|
void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
|
|
{
|
|
return slob_alloc_node(cachep, flags, NUMA_NO_NODE);
|
|
}
|
|
EXPORT_SYMBOL(kmem_cache_alloc);
|
|
|
|
#ifdef CONFIG_NUMA
|
|
void *__kmalloc_node(size_t size, gfp_t gfp, int node)
|
|
{
|
|
return __do_kmalloc_node(size, gfp, node, _RET_IP_);
|
|
}
|
|
EXPORT_SYMBOL(__kmalloc_node);
|
|
|
|
void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t gfp, int node)
|
|
{
|
|
return slob_alloc_node(cachep, gfp, node);
|
|
}
|
|
EXPORT_SYMBOL(kmem_cache_alloc_node);
|
|
#endif
|
|
|
|
static void __kmem_cache_free(void *b, int size)
|
|
{
|
|
if (size < PAGE_SIZE)
|
|
slob_free(b, size);
|
|
else
|
|
slob_free_pages(b, get_order(size));
|
|
}
|
|
|
|
static void kmem_rcu_free(struct rcu_head *head)
|
|
{
|
|
struct slob_rcu *slob_rcu = (struct slob_rcu *)head;
|
|
void *b = (void *)slob_rcu - (slob_rcu->size - sizeof(struct slob_rcu));
|
|
|
|
__kmem_cache_free(b, slob_rcu->size);
|
|
}
|
|
|
|
void kmem_cache_free(struct kmem_cache *c, void *b)
|
|
{
|
|
kmemleak_free_recursive(b, c->flags);
|
|
if (unlikely(c->flags & SLAB_TYPESAFE_BY_RCU)) {
|
|
struct slob_rcu *slob_rcu;
|
|
slob_rcu = b + (c->size - sizeof(struct slob_rcu));
|
|
slob_rcu->size = c->size;
|
|
call_rcu(&slob_rcu->head, kmem_rcu_free);
|
|
} else {
|
|
__kmem_cache_free(b, c->size);
|
|
}
|
|
|
|
trace_kmem_cache_free(_RET_IP_, b, c->name);
|
|
}
|
|
EXPORT_SYMBOL(kmem_cache_free);
|
|
|
|
void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p)
|
|
{
|
|
__kmem_cache_free_bulk(s, size, p);
|
|
}
|
|
EXPORT_SYMBOL(kmem_cache_free_bulk);
|
|
|
|
int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
|
|
void **p)
|
|
{
|
|
return __kmem_cache_alloc_bulk(s, flags, size, p);
|
|
}
|
|
EXPORT_SYMBOL(kmem_cache_alloc_bulk);
|
|
|
|
int __kmem_cache_shutdown(struct kmem_cache *c)
|
|
{
|
|
/* No way to check for remaining objects */
|
|
return 0;
|
|
}
|
|
|
|
void __kmem_cache_release(struct kmem_cache *c)
|
|
{
|
|
}
|
|
|
|
int __kmem_cache_shrink(struct kmem_cache *d)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
struct kmem_cache kmem_cache_boot = {
|
|
.name = "kmem_cache",
|
|
.size = sizeof(struct kmem_cache),
|
|
.flags = SLAB_PANIC,
|
|
.align = ARCH_KMALLOC_MINALIGN,
|
|
};
|
|
|
|
void __init kmem_cache_init(void)
|
|
{
|
|
kmem_cache = &kmem_cache_boot;
|
|
slab_state = UP;
|
|
}
|
|
|
|
void __init kmem_cache_init_late(void)
|
|
{
|
|
slab_state = FULL;
|
|
}
|