Messages in this thread | | | Date | Thu, 19 Jul 2018 09:35:30 +0100 | From | Mel Gorman <> | Subject | Re: [PATCH v3 3/7] mm, slab: allocate off-slab freelists as reclaimable when appropriate |
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On Wed, Jul 18, 2018 at 03:36:16PM +0200, Vlastimil Babka wrote: > 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>
I'm not quite convinced by this one. The freelist cache is tied to the lifetime of the slab and not the objects. A single freelist can be reclaimed eventually but for caches with many objects per slab, it could take a lot of shrinking random objects to reclaim one freelist. Functionally the patch appears to be fine.
-- Mel Gorman SUSE Labs
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