On 08/21/2012 12:22 PM, Michal Hocko wrote: > On Thu 09-08-12 17:01:18, Glauber Costa wrote: >> Because the ultimate goal of the kmem tracking in memcg is to track slab >> pages as well, we can't guarantee that we'll always be able to point a >> page to a particular process, and migrate the charges along with it - >> since in the common case, a page will contain data belonging to multiple >> processes. >> >> Because of that, when we destroy a memcg, we only make sure the >> destruction will succeed by discounting the kmem charges from the user >> charges when we try to empty the cgroup. > > This changes the semantic of memory.force_empty file because the usage > should be 0 on success but it will show kmem usage in fact now. I guess > it is inevitable with u+k accounting so you should be explicit about > that and also update the documentation. aaand, it's done.
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