2017-08-10 16:26 GMT+08:00 wang Yu <yuwang668899@xxxxxxxxx>: > 2017-08-10 16:19 GMT+08:00 Michal Hocko <mhocko@xxxxxxxxxx>: >> [Please do not top-post] >> >> On Thu 10-08-17 16:10:45, wang Yu wrote: >>> 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
