On Tue 12-02-13 12:37:41, Johannes Weiner wrote:
> On Tue, Feb 12, 2013 at 06:12:16PM +0100, Michal Hocko wrote:
[...]
> > diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> > index 727ec39..31bb9b0 100644
> > --- a/mm/memcontrol.c
> > +++ b/mm/memcontrol.c
> > @@ -144,8 +144,13 @@ struct mem_cgroup_stat_cpu {
> > };
> >
> > struct mem_cgroup_reclaim_iter {
> > - /* last scanned hierarchy member with elevated css ref count */
> > + /*
> > + * last scanned hierarchy member. Valid only if last_dead_count
> > + * matches memcg->dead_count of the hierarchy root group.
> > + */
> > struct mem_cgroup *last_visited;
> > + unsigned int last_dead_count;
>
> Since we read and write this without a lock, I would feel more
> comfortable if this were a full word, i.e. unsigned long. That
> guarantees we don't see any partial states.
OK. Changed. Although I though that int is read/modified atomically as
well if it is aligned to its size.
--
Michal Hocko
SUSE Labs
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
