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authorVlastimil Babka <vbabka@suse.cz>2019-10-06 17:58:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-10-07 15:47:20 -0700
commit6a486c0ad4dcdee3946842c64884d2978bfe2602 (patch)
tree7bdc3b0ed7cc789f8bccc260da91523b9e82dd00 /mm/slab_common.c
parent1bc63fb1272be0773e925f78c0fbd06c89701d55 (diff)
mm, sl[ou]b: improve memory accounting
Patch series "guarantee natural alignment for kmalloc()", v2. This patch (of 2): SLOB currently doesn't account its pages at all, so in /proc/meminfo the Slab field shows zero. Modifying a counter on page allocation and freeing should be acceptable even for the small system scenarios SLOB is intended for. Since reclaimable caches are not separated in SLOB, account everything as unreclaimable. SLUB currently doesn't account kmalloc() and kmalloc_node() allocations larger than order-1 page, that are passed directly to the page allocator. As they also don't appear in /proc/slabinfo, it might look like a memory leak. For consistency, account them as well. (SLAB doesn't actually use page allocator directly, so no change there). Ideally SLOB and SLUB would be handled in separate patches, but due to the shared kmalloc_order() function and different kfree() implementations, it's easier to patch both at once to prevent inconsistencies. Link: http://lkml.kernel.org/r/20190826111627.7505-2-vbabka@suse.cz Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Ming Lei <ming.lei@redhat.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: "Darrick J . Wong" <darrick.wong@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slab_common.c')
-rw-r--r--mm/slab_common.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 6491c3a41805..0a94cf858aa4 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1287,12 +1287,16 @@ void __init create_kmalloc_caches(slab_flags_t flags)
*/
void *kmalloc_order(size_t size, gfp_t flags, unsigned int order)
{
- void *ret;
+ void *ret = NULL;
struct page *page;
flags |= __GFP_COMP;
page = alloc_pages(flags, order);
- ret = page ? page_address(page) : NULL;
+ if (likely(page)) {
+ ret = page_address(page);
+ mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE,
+ 1 << order);
+ }
ret = kasan_kmalloc_large(ret, size, flags);
/* As ret might get tagged, call kmemleak hook after KASAN. */
kmemleak_alloc(ret, size, 1, flags);