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9f186f9e5f
Patch series "A few fixup patches for mm", v4. This series contains a few patches to avoid mapping random data if swap read fails and fix lost swap bits in unuse_pte. Also we free hwpoison and swapin error entry in madvise_free_pte_range and so on. More details can be found in the respective changelogs. This patch (of 5): There is a bug in unuse_pte(): when swap page happens to be unreadable, page filled with random data is mapped into user address space. In case of error, a special swap entry indicating swap read fails is set to the page table. So the swapcache page can be freed and the user won't end up with a permanently mounted swap because a sector is bad. And if the page is accessed later, the user process will be killed so that corrupted data is never consumed. On the other hand, if the page is never accessed, the user won't even notice it. Link: https://lkml.kernel.org/r/20220519125030.21486-1-linmiaohe@huawei.com Link: https://lkml.kernel.org/r/20220519125030.21486-2-linmiaohe@huawei.com Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: David Howells <dhowells@redhat.com> Cc: NeilBrown <neilb@suse.de> Cc: Alistair Popple <apopple@nvidia.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Peter Xu <peterx@redhat.com> Cc: Ralph Campbell <rcampbell@nvidia.com> Cc: Naoya Horiguchi <naoya.horiguchi@nec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
700 lines
21 KiB
C
700 lines
21 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SWAP_H
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#define _LINUX_SWAP_H
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#include <linux/spinlock.h>
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#include <linux/linkage.h>
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#include <linux/mmzone.h>
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#include <linux/list.h>
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#include <linux/memcontrol.h>
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#include <linux/sched.h>
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#include <linux/node.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/atomic.h>
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#include <linux/page-flags.h>
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#include <uapi/linux/mempolicy.h>
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#include <asm/page.h>
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struct notifier_block;
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struct bio;
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struct pagevec;
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#define SWAP_FLAG_PREFER 0x8000 /* set if swap priority specified */
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#define SWAP_FLAG_PRIO_MASK 0x7fff
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#define SWAP_FLAG_PRIO_SHIFT 0
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#define SWAP_FLAG_DISCARD 0x10000 /* enable discard for swap */
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#define SWAP_FLAG_DISCARD_ONCE 0x20000 /* discard swap area at swapon-time */
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#define SWAP_FLAG_DISCARD_PAGES 0x40000 /* discard page-clusters after use */
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#define SWAP_FLAGS_VALID (SWAP_FLAG_PRIO_MASK | SWAP_FLAG_PREFER | \
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SWAP_FLAG_DISCARD | SWAP_FLAG_DISCARD_ONCE | \
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SWAP_FLAG_DISCARD_PAGES)
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#define SWAP_BATCH 64
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static inline int current_is_kswapd(void)
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{
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return current->flags & PF_KSWAPD;
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}
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/*
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* MAX_SWAPFILES defines the maximum number of swaptypes: things which can
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* be swapped to. The swap type and the offset into that swap type are
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* encoded into pte's and into pgoff_t's in the swapcache. Using five bits
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* for the type means that the maximum number of swapcache pages is 27 bits
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* on 32-bit-pgoff_t architectures. And that assumes that the architecture packs
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* the type/offset into the pte as 5/27 as well.
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*/
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#define MAX_SWAPFILES_SHIFT 5
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/*
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* Use some of the swap files numbers for other purposes. This
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* is a convenient way to hook into the VM to trigger special
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* actions on faults.
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*/
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#define SWP_SWAPIN_ERROR_NUM 1
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#define SWP_SWAPIN_ERROR (MAX_SWAPFILES + SWP_HWPOISON_NUM + \
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SWP_MIGRATION_NUM + SWP_DEVICE_NUM + \
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SWP_PTE_MARKER_NUM)
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/*
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* PTE markers are used to persist information onto PTEs that are mapped with
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* file-backed memories. As its name "PTE" hints, it should only be applied to
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* the leaves of pgtables.
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*/
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#ifdef CONFIG_PTE_MARKER
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#define SWP_PTE_MARKER_NUM 1
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#define SWP_PTE_MARKER (MAX_SWAPFILES + SWP_HWPOISON_NUM + \
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SWP_MIGRATION_NUM + SWP_DEVICE_NUM)
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#else
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#define SWP_PTE_MARKER_NUM 0
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#endif
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/*
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* Unaddressable device memory support. See include/linux/hmm.h and
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* Documentation/vm/hmm.rst. Short description is we need struct pages for
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* device memory that is unaddressable (inaccessible) by CPU, so that we can
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* migrate part of a process memory to device memory.
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*
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* When a page is migrated from CPU to device, we set the CPU page table entry
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* to a special SWP_DEVICE_{READ|WRITE} entry.
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*
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* When a page is mapped by the device for exclusive access we set the CPU page
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* table entries to special SWP_DEVICE_EXCLUSIVE_* entries.
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*/
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#ifdef CONFIG_DEVICE_PRIVATE
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#define SWP_DEVICE_NUM 4
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#define SWP_DEVICE_WRITE (MAX_SWAPFILES+SWP_HWPOISON_NUM+SWP_MIGRATION_NUM)
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#define SWP_DEVICE_READ (MAX_SWAPFILES+SWP_HWPOISON_NUM+SWP_MIGRATION_NUM+1)
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#define SWP_DEVICE_EXCLUSIVE_WRITE (MAX_SWAPFILES+SWP_HWPOISON_NUM+SWP_MIGRATION_NUM+2)
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#define SWP_DEVICE_EXCLUSIVE_READ (MAX_SWAPFILES+SWP_HWPOISON_NUM+SWP_MIGRATION_NUM+3)
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#else
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#define SWP_DEVICE_NUM 0
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#endif
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/*
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* Page migration support.
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*
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* SWP_MIGRATION_READ_EXCLUSIVE is only applicable to anonymous pages and
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* indicates that the referenced (part of) an anonymous page is exclusive to
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* a single process. For SWP_MIGRATION_WRITE, that information is implicit:
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* (part of) an anonymous page that are mapped writable are exclusive to a
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* single process.
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*/
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#ifdef CONFIG_MIGRATION
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#define SWP_MIGRATION_NUM 3
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#define SWP_MIGRATION_READ (MAX_SWAPFILES + SWP_HWPOISON_NUM)
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#define SWP_MIGRATION_READ_EXCLUSIVE (MAX_SWAPFILES + SWP_HWPOISON_NUM + 1)
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#define SWP_MIGRATION_WRITE (MAX_SWAPFILES + SWP_HWPOISON_NUM + 2)
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#else
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#define SWP_MIGRATION_NUM 0
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#endif
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/*
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* Handling of hardware poisoned pages with memory corruption.
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*/
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#ifdef CONFIG_MEMORY_FAILURE
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#define SWP_HWPOISON_NUM 1
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#define SWP_HWPOISON MAX_SWAPFILES
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#else
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#define SWP_HWPOISON_NUM 0
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#endif
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#define MAX_SWAPFILES \
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((1 << MAX_SWAPFILES_SHIFT) - SWP_DEVICE_NUM - \
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SWP_MIGRATION_NUM - SWP_HWPOISON_NUM - \
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SWP_PTE_MARKER_NUM - SWP_SWAPIN_ERROR_NUM)
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/*
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* Magic header for a swap area. The first part of the union is
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* what the swap magic looks like for the old (limited to 128MB)
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* swap area format, the second part of the union adds - in the
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* old reserved area - some extra information. Note that the first
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* kilobyte is reserved for boot loader or disk label stuff...
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*
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* Having the magic at the end of the PAGE_SIZE makes detecting swap
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* areas somewhat tricky on machines that support multiple page sizes.
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* For 2.5 we'll probably want to move the magic to just beyond the
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* bootbits...
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*/
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union swap_header {
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struct {
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char reserved[PAGE_SIZE - 10];
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char magic[10]; /* SWAP-SPACE or SWAPSPACE2 */
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} magic;
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struct {
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char bootbits[1024]; /* Space for disklabel etc. */
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__u32 version;
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__u32 last_page;
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__u32 nr_badpages;
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unsigned char sws_uuid[16];
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unsigned char sws_volume[16];
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__u32 padding[117];
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__u32 badpages[1];
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} info;
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};
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/*
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* current->reclaim_state points to one of these when a task is running
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* memory reclaim
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*/
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struct reclaim_state {
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unsigned long reclaimed_slab;
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};
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#ifdef __KERNEL__
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struct address_space;
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struct sysinfo;
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struct writeback_control;
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struct zone;
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/*
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* A swap extent maps a range of a swapfile's PAGE_SIZE pages onto a range of
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* disk blocks. A rbtree of swap extents maps the entire swapfile (Where the
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* term `swapfile' refers to either a blockdevice or an IS_REG file). Apart
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* from setup, they're handled identically.
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*
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* We always assume that blocks are of size PAGE_SIZE.
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*/
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struct swap_extent {
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struct rb_node rb_node;
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pgoff_t start_page;
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pgoff_t nr_pages;
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sector_t start_block;
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};
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/*
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* Max bad pages in the new format..
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*/
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#define MAX_SWAP_BADPAGES \
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((offsetof(union swap_header, magic.magic) - \
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offsetof(union swap_header, info.badpages)) / sizeof(int))
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enum {
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SWP_USED = (1 << 0), /* is slot in swap_info[] used? */
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SWP_WRITEOK = (1 << 1), /* ok to write to this swap? */
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SWP_DISCARDABLE = (1 << 2), /* blkdev support discard */
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SWP_DISCARDING = (1 << 3), /* now discarding a free cluster */
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SWP_SOLIDSTATE = (1 << 4), /* blkdev seeks are cheap */
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SWP_CONTINUED = (1 << 5), /* swap_map has count continuation */
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SWP_BLKDEV = (1 << 6), /* its a block device */
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SWP_ACTIVATED = (1 << 7), /* set after swap_activate success */
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SWP_FS_OPS = (1 << 8), /* swapfile operations go through fs */
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SWP_AREA_DISCARD = (1 << 9), /* single-time swap area discards */
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SWP_PAGE_DISCARD = (1 << 10), /* freed swap page-cluster discards */
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SWP_STABLE_WRITES = (1 << 11), /* no overwrite PG_writeback pages */
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SWP_SYNCHRONOUS_IO = (1 << 12), /* synchronous IO is efficient */
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/* add others here before... */
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SWP_SCANNING = (1 << 14), /* refcount in scan_swap_map */
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};
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#define SWAP_CLUSTER_MAX 32UL
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#define COMPACT_CLUSTER_MAX SWAP_CLUSTER_MAX
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/* Bit flag in swap_map */
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#define SWAP_HAS_CACHE 0x40 /* Flag page is cached, in first swap_map */
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#define COUNT_CONTINUED 0x80 /* Flag swap_map continuation for full count */
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/* Special value in first swap_map */
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#define SWAP_MAP_MAX 0x3e /* Max count */
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#define SWAP_MAP_BAD 0x3f /* Note page is bad */
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#define SWAP_MAP_SHMEM 0xbf /* Owned by shmem/tmpfs */
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/* Special value in each swap_map continuation */
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#define SWAP_CONT_MAX 0x7f /* Max count */
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/*
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* We use this to track usage of a cluster. A cluster is a block of swap disk
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* space with SWAPFILE_CLUSTER pages long and naturally aligns in disk. All
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* free clusters are organized into a list. We fetch an entry from the list to
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* get a free cluster.
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*
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* The data field stores next cluster if the cluster is free or cluster usage
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* counter otherwise. The flags field determines if a cluster is free. This is
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* protected by swap_info_struct.lock.
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*/
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struct swap_cluster_info {
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spinlock_t lock; /*
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* Protect swap_cluster_info fields
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* and swap_info_struct->swap_map
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* elements correspond to the swap
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* cluster
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*/
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unsigned int data:24;
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unsigned int flags:8;
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};
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#define CLUSTER_FLAG_FREE 1 /* This cluster is free */
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#define CLUSTER_FLAG_NEXT_NULL 2 /* This cluster has no next cluster */
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#define CLUSTER_FLAG_HUGE 4 /* This cluster is backing a transparent huge page */
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/*
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* We assign a cluster to each CPU, so each CPU can allocate swap entry from
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* its own cluster and swapout sequentially. The purpose is to optimize swapout
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* throughput.
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*/
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struct percpu_cluster {
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struct swap_cluster_info index; /* Current cluster index */
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unsigned int next; /* Likely next allocation offset */
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};
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struct swap_cluster_list {
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struct swap_cluster_info head;
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struct swap_cluster_info tail;
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};
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/*
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* The in-memory structure used to track swap areas.
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*/
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struct swap_info_struct {
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struct percpu_ref users; /* indicate and keep swap device valid. */
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unsigned long flags; /* SWP_USED etc: see above */
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signed short prio; /* swap priority of this type */
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struct plist_node list; /* entry in swap_active_head */
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signed char type; /* strange name for an index */
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unsigned int max; /* extent of the swap_map */
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unsigned char *swap_map; /* vmalloc'ed array of usage counts */
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struct swap_cluster_info *cluster_info; /* cluster info. Only for SSD */
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struct swap_cluster_list free_clusters; /* free clusters list */
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unsigned int lowest_bit; /* index of first free in swap_map */
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unsigned int highest_bit; /* index of last free in swap_map */
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unsigned int pages; /* total of usable pages of swap */
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unsigned int inuse_pages; /* number of those currently in use */
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unsigned int cluster_next; /* likely index for next allocation */
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unsigned int cluster_nr; /* countdown to next cluster search */
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unsigned int __percpu *cluster_next_cpu; /*percpu index for next allocation */
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struct percpu_cluster __percpu *percpu_cluster; /* per cpu's swap location */
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struct rb_root swap_extent_root;/* root of the swap extent rbtree */
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struct block_device *bdev; /* swap device or bdev of swap file */
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struct file *swap_file; /* seldom referenced */
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unsigned int old_block_size; /* seldom referenced */
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struct completion comp; /* seldom referenced */
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#ifdef CONFIG_FRONTSWAP
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unsigned long *frontswap_map; /* frontswap in-use, one bit per page */
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atomic_t frontswap_pages; /* frontswap pages in-use counter */
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#endif
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spinlock_t lock; /*
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* protect map scan related fields like
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* swap_map, lowest_bit, highest_bit,
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* inuse_pages, cluster_next,
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* cluster_nr, lowest_alloc,
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* highest_alloc, free/discard cluster
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* list. other fields are only changed
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* at swapon/swapoff, so are protected
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* by swap_lock. changing flags need
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* hold this lock and swap_lock. If
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* both locks need hold, hold swap_lock
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* first.
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*/
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spinlock_t cont_lock; /*
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* protect swap count continuation page
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* list.
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*/
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struct work_struct discard_work; /* discard worker */
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struct swap_cluster_list discard_clusters; /* discard clusters list */
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struct plist_node avail_lists[]; /*
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* entries in swap_avail_heads, one
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* entry per node.
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* Must be last as the number of the
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* array is nr_node_ids, which is not
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* a fixed value so have to allocate
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* dynamically.
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* And it has to be an array so that
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* plist_for_each_* can work.
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*/
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};
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#ifdef CONFIG_64BIT
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#define SWAP_RA_ORDER_CEILING 5
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#else
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/* Avoid stack overflow, because we need to save part of page table */
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#define SWAP_RA_ORDER_CEILING 3
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#define SWAP_RA_PTE_CACHE_SIZE (1 << SWAP_RA_ORDER_CEILING)
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#endif
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struct vma_swap_readahead {
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unsigned short win;
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unsigned short offset;
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unsigned short nr_pte;
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#ifdef CONFIG_64BIT
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pte_t *ptes;
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#else
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pte_t ptes[SWAP_RA_PTE_CACHE_SIZE];
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#endif
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};
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static inline swp_entry_t folio_swap_entry(struct folio *folio)
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{
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swp_entry_t entry = { .val = page_private(&folio->page) };
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return entry;
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}
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/* linux/mm/workingset.c */
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void workingset_age_nonresident(struct lruvec *lruvec, unsigned long nr_pages);
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void *workingset_eviction(struct folio *folio, struct mem_cgroup *target_memcg);
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void workingset_refault(struct folio *folio, void *shadow);
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void workingset_activation(struct folio *folio);
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/* Only track the nodes of mappings with shadow entries */
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void workingset_update_node(struct xa_node *node);
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extern struct list_lru shadow_nodes;
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#define mapping_set_update(xas, mapping) do { \
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if (!dax_mapping(mapping) && !shmem_mapping(mapping)) { \
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xas_set_update(xas, workingset_update_node); \
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xas_set_lru(xas, &shadow_nodes); \
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} \
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} while (0)
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/* linux/mm/page_alloc.c */
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extern unsigned long totalreserve_pages;
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/* Definition of global_zone_page_state not available yet */
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#define nr_free_pages() global_zone_page_state(NR_FREE_PAGES)
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/* linux/mm/swap.c */
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extern void lru_note_cost(struct lruvec *lruvec, bool file,
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unsigned int nr_pages);
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extern void lru_note_cost_folio(struct folio *);
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extern void folio_add_lru(struct folio *);
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extern void lru_cache_add(struct page *);
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void mark_page_accessed(struct page *);
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void folio_mark_accessed(struct folio *);
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extern atomic_t lru_disable_count;
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static inline bool lru_cache_disabled(void)
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{
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return atomic_read(&lru_disable_count);
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}
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static inline void lru_cache_enable(void)
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{
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atomic_dec(&lru_disable_count);
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}
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extern void lru_cache_disable(void);
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extern void lru_add_drain(void);
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extern void lru_add_drain_cpu(int cpu);
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extern void lru_add_drain_cpu_zone(struct zone *zone);
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extern void lru_add_drain_all(void);
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extern void deactivate_page(struct page *page);
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extern void mark_page_lazyfree(struct page *page);
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extern void swap_setup(void);
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extern void lru_cache_add_inactive_or_unevictable(struct page *page,
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struct vm_area_struct *vma);
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/* linux/mm/vmscan.c */
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extern unsigned long zone_reclaimable_pages(struct zone *zone);
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extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
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gfp_t gfp_mask, nodemask_t *mask);
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extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
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unsigned long nr_pages,
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gfp_t gfp_mask,
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bool may_swap);
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extern unsigned long mem_cgroup_shrink_node(struct mem_cgroup *mem,
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gfp_t gfp_mask, bool noswap,
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pg_data_t *pgdat,
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unsigned long *nr_scanned);
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extern unsigned long shrink_all_memory(unsigned long nr_pages);
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extern int vm_swappiness;
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long remove_mapping(struct address_space *mapping, struct folio *folio);
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extern unsigned long reclaim_pages(struct list_head *page_list);
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#ifdef CONFIG_NUMA
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extern int node_reclaim_mode;
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extern int sysctl_min_unmapped_ratio;
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extern int sysctl_min_slab_ratio;
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#else
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#define node_reclaim_mode 0
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#endif
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static inline bool node_reclaim_enabled(void)
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{
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/* Is any node_reclaim_mode bit set? */
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return node_reclaim_mode & (RECLAIM_ZONE|RECLAIM_WRITE|RECLAIM_UNMAP);
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}
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extern void check_move_unevictable_pages(struct pagevec *pvec);
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extern void kswapd_run(int nid);
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extern void kswapd_stop(int nid);
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#ifdef CONFIG_SWAP
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int add_swap_extent(struct swap_info_struct *sis, unsigned long start_page,
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unsigned long nr_pages, sector_t start_block);
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int generic_swapfile_activate(struct swap_info_struct *, struct file *,
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sector_t *);
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static inline unsigned long total_swapcache_pages(void)
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{
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return global_node_page_state(NR_SWAPCACHE);
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}
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extern void free_page_and_swap_cache(struct page *);
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extern void free_pages_and_swap_cache(struct page **, int);
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/* linux/mm/swapfile.c */
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extern atomic_long_t nr_swap_pages;
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extern long total_swap_pages;
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extern atomic_t nr_rotate_swap;
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extern bool has_usable_swap(void);
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/* Swap 50% full? Release swapcache more aggressively.. */
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static inline bool vm_swap_full(void)
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{
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return atomic_long_read(&nr_swap_pages) * 2 < total_swap_pages;
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}
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static inline long get_nr_swap_pages(void)
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{
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return atomic_long_read(&nr_swap_pages);
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}
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extern void si_swapinfo(struct sysinfo *);
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swp_entry_t folio_alloc_swap(struct folio *folio);
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extern void put_swap_page(struct page *page, swp_entry_t entry);
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extern swp_entry_t get_swap_page_of_type(int);
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extern int get_swap_pages(int n, swp_entry_t swp_entries[], int entry_size);
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extern int add_swap_count_continuation(swp_entry_t, gfp_t);
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extern void swap_shmem_alloc(swp_entry_t);
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extern int swap_duplicate(swp_entry_t);
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extern int swapcache_prepare(swp_entry_t);
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extern void swap_free(swp_entry_t);
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extern void swapcache_free_entries(swp_entry_t *entries, int n);
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extern int free_swap_and_cache(swp_entry_t);
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int swap_type_of(dev_t device, sector_t offset);
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int find_first_swap(dev_t *device);
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extern unsigned int count_swap_pages(int, int);
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extern sector_t swapdev_block(int, pgoff_t);
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extern int __swap_count(swp_entry_t entry);
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extern int __swp_swapcount(swp_entry_t entry);
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extern int swp_swapcount(swp_entry_t entry);
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extern struct swap_info_struct *page_swap_info(struct page *);
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extern struct swap_info_struct *swp_swap_info(swp_entry_t entry);
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extern int try_to_free_swap(struct page *);
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struct backing_dev_info;
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extern int init_swap_address_space(unsigned int type, unsigned long nr_pages);
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extern void exit_swap_address_space(unsigned int type);
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extern struct swap_info_struct *get_swap_device(swp_entry_t entry);
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sector_t swap_page_sector(struct page *page);
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static inline void put_swap_device(struct swap_info_struct *si)
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{
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percpu_ref_put(&si->users);
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}
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#else /* CONFIG_SWAP */
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static inline struct swap_info_struct *swp_swap_info(swp_entry_t entry)
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{
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return NULL;
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}
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static inline struct swap_info_struct *get_swap_device(swp_entry_t entry)
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{
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return NULL;
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}
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static inline void put_swap_device(struct swap_info_struct *si)
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{
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}
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#define get_nr_swap_pages() 0L
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#define total_swap_pages 0L
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#define total_swapcache_pages() 0UL
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#define vm_swap_full() 0
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#define si_swapinfo(val) \
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do { (val)->freeswap = (val)->totalswap = 0; } while (0)
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/* only sparc can not include linux/pagemap.h in this file
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* so leave put_page and release_pages undeclared... */
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#define free_page_and_swap_cache(page) \
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put_page(page)
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#define free_pages_and_swap_cache(pages, nr) \
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release_pages((pages), (nr));
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/* used to sanity check ptes in zap_pte_range when CONFIG_SWAP=0 */
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#define free_swap_and_cache(e) is_pfn_swap_entry(e)
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static inline int add_swap_count_continuation(swp_entry_t swp, gfp_t gfp_mask)
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{
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return 0;
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}
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static inline void swap_shmem_alloc(swp_entry_t swp)
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{
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}
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static inline int swap_duplicate(swp_entry_t swp)
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{
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return 0;
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}
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static inline void swap_free(swp_entry_t swp)
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{
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}
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static inline void put_swap_page(struct page *page, swp_entry_t swp)
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{
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}
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static inline int __swap_count(swp_entry_t entry)
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{
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return 0;
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}
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|
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static inline int __swp_swapcount(swp_entry_t entry)
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|
{
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return 0;
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}
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|
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static inline int swp_swapcount(swp_entry_t entry)
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{
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return 0;
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}
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static inline int try_to_free_swap(struct page *page)
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{
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return 0;
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}
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static inline swp_entry_t folio_alloc_swap(struct folio *folio)
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|
{
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swp_entry_t entry;
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entry.val = 0;
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return entry;
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}
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static inline int add_swap_extent(struct swap_info_struct *sis,
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unsigned long start_page,
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unsigned long nr_pages, sector_t start_block)
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|
{
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return -EINVAL;
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}
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#endif /* CONFIG_SWAP */
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|
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#ifdef CONFIG_THP_SWAP
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extern int split_swap_cluster(swp_entry_t entry);
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#else
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static inline int split_swap_cluster(swp_entry_t entry)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_MEMCG
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static inline int mem_cgroup_swappiness(struct mem_cgroup *memcg)
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|
{
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/* Cgroup2 doesn't have per-cgroup swappiness */
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if (cgroup_subsys_on_dfl(memory_cgrp_subsys))
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return vm_swappiness;
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/* root ? */
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if (mem_cgroup_disabled() || mem_cgroup_is_root(memcg))
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return vm_swappiness;
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return memcg->swappiness;
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}
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#else
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static inline int mem_cgroup_swappiness(struct mem_cgroup *mem)
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{
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return vm_swappiness;
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}
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#endif
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|
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#ifdef CONFIG_ZSWAP
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extern u64 zswap_pool_total_size;
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|
extern atomic_t zswap_stored_pages;
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#endif
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|
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#if defined(CONFIG_SWAP) && defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP)
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|
extern void __cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask);
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static inline void cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask)
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|
{
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|
if (mem_cgroup_disabled())
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|
return;
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|
__cgroup_throttle_swaprate(page, gfp_mask);
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}
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#else
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static inline void cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask)
|
|
{
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|
}
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|
#endif
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|
static inline void folio_throttle_swaprate(struct folio *folio, gfp_t gfp)
|
|
{
|
|
cgroup_throttle_swaprate(&folio->page, gfp);
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|
}
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|
|
#ifdef CONFIG_MEMCG_SWAP
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|
void mem_cgroup_swapout(struct folio *folio, swp_entry_t entry);
|
|
int __mem_cgroup_try_charge_swap(struct folio *folio, swp_entry_t entry);
|
|
static inline int mem_cgroup_try_charge_swap(struct folio *folio,
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|
swp_entry_t entry)
|
|
{
|
|
if (mem_cgroup_disabled())
|
|
return 0;
|
|
return __mem_cgroup_try_charge_swap(folio, entry);
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|
}
|
|
|
|
extern void __mem_cgroup_uncharge_swap(swp_entry_t entry, unsigned int nr_pages);
|
|
static inline void mem_cgroup_uncharge_swap(swp_entry_t entry, unsigned int nr_pages)
|
|
{
|
|
if (mem_cgroup_disabled())
|
|
return;
|
|
__mem_cgroup_uncharge_swap(entry, nr_pages);
|
|
}
|
|
|
|
extern long mem_cgroup_get_nr_swap_pages(struct mem_cgroup *memcg);
|
|
extern bool mem_cgroup_swap_full(struct page *page);
|
|
#else
|
|
static inline void mem_cgroup_swapout(struct folio *folio, swp_entry_t entry)
|
|
{
|
|
}
|
|
|
|
static inline int mem_cgroup_try_charge_swap(struct folio *folio,
|
|
swp_entry_t entry)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void mem_cgroup_uncharge_swap(swp_entry_t entry,
|
|
unsigned int nr_pages)
|
|
{
|
|
}
|
|
|
|
static inline long mem_cgroup_get_nr_swap_pages(struct mem_cgroup *memcg)
|
|
{
|
|
return get_nr_swap_pages();
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|
}
|
|
|
|
static inline bool mem_cgroup_swap_full(struct page *page)
|
|
{
|
|
return vm_swap_full();
|
|
}
|
|
#endif
|
|
|
|
#endif /* __KERNEL__*/
|
|
#endif /* _LINUX_SWAP_H */
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