Remove "memcg/slab: reintroduce dead cache self-destruction" from mmotm
From: Vladimir Davydov
Date: Tue Jul 15 2014 - 11:19:23 EST
Could you drop the following patches please?
The patches implement self-destruction of kmem caches that belong to
dead memory cgroups (see https://lkml.org/lkml/2014/6/12/681). They were
needed for re-parenting kmem charges on memcg offline.
However, as Johannes explained, recent changes to the cgroup core made
re-parenting of memcg charges unnecessary, because now we can iterate
over offline css's on memory pressure and reclaim their charges, just as
we do with online css's (see https://lkml.org/lkml/2014/7/7/335). As a
result, it isn't strictly necessary to destroy dead kmem caches as soon
as the last object is freed, because we can add a per memcg slab
shrinker for them.
Since the implementation of kmem cache self-destruction is quite
intrusive to the slab core and, what is worse, degrades kfree
performance for dead caches noticeably (especially for SLAB, see
https://lkml.org/lkml/2014/6/25/520), I propose to drop it.
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