2017-08-10 16:26 GMT+08:00 wang Yu [off-list ref]:

2017-08-10 16:19 GMT+08:00 Michal Hocko [off-list ref]:

quoted

[Please do not top-post]

On Thu 10-08-17 16:10:45, wang Yu wrote:

quoted

at first ,thanks for your reply.
but i also tested what you said, the problem is also.
force_empty only call try_to_free_pages, not all the pages remove
because mem_cgroup_reparent_charges moved

Right. An alternative would be dropping the page cache globaly via
/proc/sys/vm/drop_caches. Not an ideal solution but it should help.
--
Michal Hocko
SUSE Labs

thanks again, but /proc/sys/vm/drop_caches can't solve it
you can try as follow

#cat /proc/cgroups

memory 11 2 1

#mkdir a

#echo 0 > a/cgroup.procs

#sleep 1

#echo 0 > cgroup.procs

#echo 1 > a/memory.force_empty

#echo 3 > /proc/sys/vm/drop_caches

#rmdir  a

#cat /proc/cgroups

memory 11 3 1
the  num_cgroups not decrease

and i found that, after drop cache

after drop caches, memory.stat  shows not pages belong the group, but
memory.usage_in_bytes not zero, so maybe other pages
has wrong to belong this cgroup

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