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authorMatthew Wilcox <mawilcox@microsoft.com>2018-06-07 17:08:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-07 17:34:37 -0700
commit7d27a04bb2b5bd665f147439d18ae236080eef32 (patch)
tree2798e10870a5932a694807b58215da370d1efb06 /mm/slub.c
parentd4fc5069a39405d67937b25c0dc9249a9b6c50f1 (diff)
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mm: move 'private' union within struct page
By moving page->private to the fourth word of struct page, we can put the SLUB counters in the same word as SLAB's s_mem and still do the cmpxchg_double trick. Now the SLUB counters no longer overlap with the mapcount or refcount so we can drop the call to page_mapcount_reset() and simplify set_page_slub_counters() to a single line. Link: http://lkml.kernel.org/r/20180518194519.3820-6-willy@infradead.org Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Christoph Lameter <cl@linux.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c20
1 files changed, 2 insertions, 18 deletions
diff --git a/mm/slub.c b/mm/slub.c
index 0170ea8a97fe..f5db87839ab4 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -356,21 +356,6 @@ static __always_inline void slab_unlock(struct page *page)
__bit_spin_unlock(PG_locked, &page->flags);
}
-static inline void set_page_slub_counters(struct page *page, unsigned long counters_new)
-{
- struct page tmp;
- tmp.counters = counters_new;
- /*
- * page->counters can cover frozen/inuse/objects as well
- * as page->_refcount. If we assign to ->counters directly
- * we run the risk of losing updates to page->_refcount, so
- * be careful and only assign to the fields we need.
- */
- page->frozen = tmp.frozen;
- page->inuse = tmp.inuse;
- page->objects = tmp.objects;
-}
-
/* Interrupts must be disabled (for the fallback code to work right) */
static inline bool __cmpxchg_double_slab(struct kmem_cache *s, struct page *page,
void *freelist_old, unsigned long counters_old,
@@ -392,7 +377,7 @@ static inline bool __cmpxchg_double_slab(struct kmem_cache *s, struct page *page
if (page->freelist == freelist_old &&
page->counters == counters_old) {
page->freelist = freelist_new;
- set_page_slub_counters(page, counters_new);
+ page->counters = counters_new;
slab_unlock(page);
return true;
}
@@ -431,7 +416,7 @@ static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page,
if (page->freelist == freelist_old &&
page->counters == counters_old) {
page->freelist = freelist_new;
- set_page_slub_counters(page, counters_new);
+ page->counters = counters_new;
slab_unlock(page);
local_irq_restore(flags);
return true;
@@ -1694,7 +1679,6 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
__ClearPageSlabPfmemalloc(page);
__ClearPageSlab(page);
- page_mapcount_reset(page);
page->mapping = NULL;
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += pages;