On Mon 16-06-14 09:57:41, Tejun Heo wrote: > Hello, Michal. > > On Mon, Jun 16, 2014 at 02:59:15PM +0200, Michal Hocko wrote: > > > There sure is a question of how fast userland will move to the new > > > interface. > > > > Yeah, I was mostly thinking about those who would need to to bigger > > changes. AFAIR threads will no longer be distributable between groups. > > Thread-level granularity should go away no matter what, but this is > completely irrelevant to memcg which can't do per-thread anyway. Yes, I wasn't afraid about memcg. It was a setup which requires more controllers that I was worried about. > For whatever reason, a user is stuck with thread-level granularity for > controllers which work that way, the user can use the old hierarchies > for them for the time being. So he can mount memcg with new cgroup API and others with old? > > > is used but I don't think there's any chance of removing the knob. > > > There's a reason why we're introducing a new version of the whole > > > cgroup interface which can co-exist with the existing one after all. > > > If you wanna version memcg interface separately, maybe that'd work but > > > it sounds like a lot of extra hassle for not much gain. > > > > No, I didn't mean to version the interface. I just wanted to have > > gradual transition for potential soft_limit users. > > > > Maybe I am misunderstanding something but I thought that new version of > > API will contain all knobs which are not marked .flags = CFTYPE_INSANE > > while the old API will contain all of them. > > Nope, some changes don't fit that model. CFTYPE_ON_ON_DFL is the > opposite. OK, I wasn't aware of this. On which branch I find this? > Knobs marked with the flag only appear on the default > hierarchy (cgroup core internally calls it the default hierarchy as > this is the tree all the controllers are attached to by default). I am not sure I understand. So they are visible only in the hierarchy mounted with the new cgroup API (sane or how is it called)? -- Michal Hocko SUSE Labs -- 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>