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    SubjectRe: [PATCH v4 24/25] memcg/slub: shrink dead caches
    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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