Messages in this thread Patch in this message | | | From | Vlastimil Babka <> | Subject | [PATCH v2 3/7] mm, slab: allocate off-slab freelists as reclaimable when appropriate | Date | Mon, 18 Jun 2018 11:18:04 +0200 |
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In SLAB, OFF_SLAB caches allocate management structures (currently just the freelist) from kmalloc caches when placement in a slab page together with objects would lead to suboptimal memory usage. For SLAB_RECLAIM_ACCOUNT caches, we can allocate the freelists from the newly introduced reclaimable kmalloc caches, because shrinking the OFF_SLAB cache will in general result to freeing of the freelists as well. This should improve accounting and anti-fragmentation a bit.
Signed-off-by: Vlastimil Babka <vbabka@suse.cz> --- mm/slab.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/mm/slab.c b/mm/slab.c index 9515798f37b2..99d779ba2b92 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -2140,8 +2140,13 @@ int __kmem_cache_create(struct kmem_cache *cachep, slab_flags_t flags) #endif if (OFF_SLAB(cachep)) { + /* + * If this cache is reclaimable, allocate also freelists from + * a reclaimable kmalloc cache. + */ cachep->freelist_cache = - kmalloc_slab(cachep->freelist_size, 0u); + kmalloc_slab(cachep->freelist_size, + cachep->allocflags & __GFP_RECLAIMABLE); } err = setup_cpu_cache(cachep, gfp); -- 2.17.1
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