On 07/25/2012 07:23 PM, Christoph Lameter wrote:

On Fri, 20 Jul 2012, Glauber Costa wrote:

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This is the same btw in SLAB which keeps objects in per cpu caches and
keeps empty slab pages on special queues.

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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.

Doesn't the SLAB have a time-based reaper for that?

Yes but it will take a couple of minutes to drain the caches.

You might have seen in my last submission that included this in the slab
as well.