mirror of
https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
mm: Use owner_priv bit for PageSwapCache, valid when PageSwapBacked
A page is not added to the swap cache without being swap backed, so PageSwapBacked mappings can use PG_owner_priv_1 for PageSwapCache. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Acked-by: Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Bob Peterson <rpeterso@redhat.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Andrew Lutomirski <luto@kernel.org> Cc: Andreas Gruenbacher <agruenba@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
7c0f6ba682
commit
6326fec112
|
@ -87,7 +87,6 @@ enum pageflags {
|
|||
PG_private_2, /* If pagecache, has fs aux data */
|
||||
PG_writeback, /* Page is under writeback */
|
||||
PG_head, /* A head page */
|
||||
PG_swapcache, /* Swap page: swp_entry_t in private */
|
||||
PG_mappedtodisk, /* Has blocks allocated on-disk */
|
||||
PG_reclaim, /* To be reclaimed asap */
|
||||
PG_swapbacked, /* Page is backed by RAM/swap */
|
||||
|
@ -110,6 +109,9 @@ enum pageflags {
|
|||
/* Filesystems */
|
||||
PG_checked = PG_owner_priv_1,
|
||||
|
||||
/* SwapBacked */
|
||||
PG_swapcache = PG_owner_priv_1, /* Swap page: swp_entry_t in private */
|
||||
|
||||
/* Two page bits are conscripted by FS-Cache to maintain local caching
|
||||
* state. These bits are set on pages belonging to the netfs's inodes
|
||||
* when those inodes are being locally cached.
|
||||
|
@ -314,7 +316,13 @@ PAGEFLAG_FALSE(HighMem)
|
|||
#endif
|
||||
|
||||
#ifdef CONFIG_SWAP
|
||||
PAGEFLAG(SwapCache, swapcache, PF_NO_COMPOUND)
|
||||
static __always_inline int PageSwapCache(struct page *page)
|
||||
{
|
||||
return PageSwapBacked(page) && test_bit(PG_swapcache, &page->flags);
|
||||
|
||||
}
|
||||
SETPAGEFLAG(SwapCache, swapcache, PF_NO_COMPOUND)
|
||||
CLEARPAGEFLAG(SwapCache, swapcache, PF_NO_COMPOUND)
|
||||
#else
|
||||
PAGEFLAG_FALSE(SwapCache)
|
||||
#endif
|
||||
|
@ -705,7 +713,7 @@ static inline void ClearPageSlabPfmemalloc(struct page *page)
|
|||
(1UL << PG_lru | 1UL << PG_locked | \
|
||||
1UL << PG_private | 1UL << PG_private_2 | \
|
||||
1UL << PG_writeback | 1UL << PG_reserved | \
|
||||
1UL << PG_slab | 1UL << PG_swapcache | 1UL << PG_active | \
|
||||
1UL << PG_slab | 1UL << PG_active | \
|
||||
1UL << PG_unevictable | __PG_MLOCKED)
|
||||
|
||||
/*
|
||||
|
|
|
@ -95,7 +95,6 @@
|
|||
{1UL << PG_private_2, "private_2" }, \
|
||||
{1UL << PG_writeback, "writeback" }, \
|
||||
{1UL << PG_head, "head" }, \
|
||||
{1UL << PG_swapcache, "swapcache" }, \
|
||||
{1UL << PG_mappedtodisk, "mappedtodisk" }, \
|
||||
{1UL << PG_reclaim, "reclaim" }, \
|
||||
{1UL << PG_swapbacked, "swapbacked" }, \
|
||||
|
|
|
@ -764,12 +764,11 @@ static int me_huge_page(struct page *p, unsigned long pfn)
|
|||
*/
|
||||
|
||||
#define dirty (1UL << PG_dirty)
|
||||
#define sc (1UL << PG_swapcache)
|
||||
#define sc ((1UL << PG_swapcache) | (1UL << PG_swapbacked))
|
||||
#define unevict (1UL << PG_unevictable)
|
||||
#define mlock (1UL << PG_mlocked)
|
||||
#define writeback (1UL << PG_writeback)
|
||||
#define lru (1UL << PG_lru)
|
||||
#define swapbacked (1UL << PG_swapbacked)
|
||||
#define head (1UL << PG_head)
|
||||
#define slab (1UL << PG_slab)
|
||||
#define reserved (1UL << PG_reserved)
|
||||
|
@ -819,7 +818,6 @@ static struct page_state {
|
|||
#undef mlock
|
||||
#undef writeback
|
||||
#undef lru
|
||||
#undef swapbacked
|
||||
#undef head
|
||||
#undef slab
|
||||
#undef reserved
|
||||
|
|
|
@ -466,14 +466,16 @@ int migrate_page_move_mapping(struct address_space *mapping,
|
|||
*/
|
||||
newpage->index = page->index;
|
||||
newpage->mapping = page->mapping;
|
||||
if (PageSwapBacked(page))
|
||||
__SetPageSwapBacked(newpage);
|
||||
|
||||
get_page(newpage); /* add cache reference */
|
||||
if (PageSwapBacked(page)) {
|
||||
__SetPageSwapBacked(newpage);
|
||||
if (PageSwapCache(page)) {
|
||||
SetPageSwapCache(newpage);
|
||||
set_page_private(newpage, page_private(page));
|
||||
}
|
||||
} else {
|
||||
VM_BUG_ON_PAGE(PageSwapCache(page), page);
|
||||
}
|
||||
|
||||
/* Move dirty while page refs frozen and newpage not yet exposed */
|
||||
dirty = PageDirty(page);
|
||||
|
|
Loading…
Reference in a new issue