| Date | Fri, 6 Jul 2012 10:16:36 -0500 (CDT) | From | Christoph Lameter <> | Subject | Re: [PATCH v4 24/25] memcg/slub: shrink dead caches |
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On Mon, 18 Jun 2012, Glauber Costa wrote:
> In the slub allocator, when the last object of a page goes away, we > don't necessarily free it - there is not necessarily a test for empty > page in any slab_free path.
This is the same btw in SLAB which keeps objects in per cpu caches and keeps empty slab pages on special queues.
> This patch marks all memcg caches as dead. kmem_cache_shrink is called > for the ones who are not yet dead - this will force internal cache > reorganization, and then all references to empty pages will be removed.
You need to call this also for slab to drain the caches and free the pages on the empty list.
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