Re: [PATCH] memcg: deprecate memory.force_empty knob

[Michal Hocko]

On Mon 19-05-14 17:50:18, Michal Hocko wrote:
> On Mon 19-05-14 16:02:48, Michal Hocko wrote:
> > On Fri 16-05-14 15:00:16, Greg Thelen wrote:
> [...]
> > > -- First, demonstrate that just rmdir, without memory.force_empty,
> > >    temporarily hides reparented child memory stats.
> > > 
> > > $ /test
> > > p/memory.stat:rss 0
> > > p/memory.stat:total_rss 69632
> > > p/c/memory.stat:rss 69632
> > > p/c/memory.stat:total_rss 69632
> > > For a small time the p/c memory has not been reparented to p.
> > > p/memory.stat:rss 0
> > > p/memory.stat:total_rss 0
> > 
> > OK, this is a bug. Our iterators skip the children because css_tryget
> > fails on it but css_offline still not done.

Recent cgroup changes distinguish css_tryget and css_tryget_online
(http://marc.info/?l=linux-kernel&m=140025648704805). So we will only
need to use css_tryget rather than the _online variant in
__mem_cgroup_iter_next. I guess this is what Johannes was talking about.

-- 
Michal Hocko
SUSE Labs
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/