On Thu 06-12-12 19:39:41, Ying Han wrote:
[...]

Michal,

I got some trouble while running this patch with my test. The test
creates hundreds of memcgs which each runs some workload to generate
global pressure. At the last, it removes all the memcgs by rmdir. Then
the cmd "ls /dev/cgroup/memory/" hangs afterwards.

I studied a bit of the patch, but not spending too much time on it
yet. Looks like that the v2 has something different from your last
post, where you replaces the mem_cgroup_get() with css_get() on the
iter->last_visited. Didn't follow why we made that change, but after
restoring the behavior a bit seems passed my test.

Hmm, strange. css reference counting should be stronger than mem_cgroup
one because it pins css thus cgroup which in turn keeps memcg alive.

Here is the patch I applied on top of this one:

[...]
-- 
Michal Hocko
SUSE Labs

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