Commit 73293c2f authored by Joonsoo Kim's avatar Joonsoo Kim Committed by Pekka Enberg

slab: correct pfmemalloc check

We checked pfmemalloc by slab unit, not page unit. You can see this
in is_slab_pfmemalloc(). So other pages don't need to be set/cleared
pfmemalloc.

And, therefore we should check pfmemalloc in page flag of first page,
but current implementation don't do that. virt_to_head_page(obj) just
return 'struct page' of that object, not one of first page, since the SLAB
don't use __GFP_COMP when CONFIG_MMU. To get 'struct page' of first page,
we first get a slab and try to get it via virt_to_head_page(slab->s_mem).
Acked-by: default avatarAndi Kleen <ak@linux.intel.com>
Signed-off-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: default avatarPekka Enberg <penberg@iki.fi>
parent 6e466452
...@@ -930,7 +930,8 @@ static void *__ac_put_obj(struct kmem_cache *cachep, struct array_cache *ac, ...@@ -930,7 +930,8 @@ static void *__ac_put_obj(struct kmem_cache *cachep, struct array_cache *ac,
{ {
if (unlikely(pfmemalloc_active)) { if (unlikely(pfmemalloc_active)) {
/* Some pfmemalloc slabs exist, check if this is one */ /* Some pfmemalloc slabs exist, check if this is one */
struct page *page = virt_to_head_page(objp); struct slab *slabp = virt_to_slab(objp);
struct page *page = virt_to_head_page(slabp->s_mem);
if (PageSlabPfmemalloc(page)) if (PageSlabPfmemalloc(page))
set_obj_pfmemalloc(&objp); set_obj_pfmemalloc(&objp);
} }
...@@ -1776,7 +1777,7 @@ static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid) ...@@ -1776,7 +1777,7 @@ static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid)
__SetPageSlab(page + i); __SetPageSlab(page + i);
if (page->pfmemalloc) if (page->pfmemalloc)
SetPageSlabPfmemalloc(page + i); SetPageSlabPfmemalloc(page);
} }
memcg_bind_pages(cachep, cachep->gfporder); memcg_bind_pages(cachep, cachep->gfporder);
...@@ -1809,9 +1810,10 @@ static void kmem_freepages(struct kmem_cache *cachep, void *addr) ...@@ -1809,9 +1810,10 @@ static void kmem_freepages(struct kmem_cache *cachep, void *addr)
else else
sub_zone_page_state(page_zone(page), sub_zone_page_state(page_zone(page),
NR_SLAB_UNRECLAIMABLE, nr_freed); NR_SLAB_UNRECLAIMABLE, nr_freed);
__ClearPageSlabPfmemalloc(page);
while (i--) { while (i--) {
BUG_ON(!PageSlab(page)); BUG_ON(!PageSlab(page));
__ClearPageSlabPfmemalloc(page);
__ClearPageSlab(page); __ClearPageSlab(page);
page++; page++;
} }
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment