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, 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>