On Mon, May 13, 2013 at 09:46:12AM +0200, Michal Hocko wrote:
> Soft reclaim has been done only for the global reclaim (both background
> and direct). Since "memcg: integrate soft reclaim tighter with zone
> shrinking code" there is no reason for this limitation anymore as the
> soft limit reclaim doesn't use any special code paths and it is a
> part of the zone shrinking code which is used by both global and
> targeted reclaims.
...
> Signed-off-by: Michal Hocko <mho...@suse.cz>
Reviewed-by: Tejun Heo <t...@kernel.org>
Some nitpicks follow.
> /*
> - * A group is eligible for the soft limit reclaim if it is
> - * a) is over its soft limit
> + * A group is eligible for the soft limit reclaim under the given root
> + * hierarchy if
> + * a) it is over its soft limit
> * b) any parent up the hierarchy is over its soft limit
This was added before but in general I think the use of parent for
ancestor is a bit confusing. Not a big deal but no reason to continue
it.
> /*
> - * If any parent up the hierarchy is over its soft limit then we
> - * have to obey and reclaim from this group as well.
> + * If any parent up to the root in the hierarchy is over its soft limit
> + * then we have to obey and reclaim from this group as well.
Prolly using terms ancestors and subtree would make the explanation
clearer?
> static bool mem_cgroup_should_soft_reclaim(struct scan_control *sc)
> {
> - return global_reclaim(sc);
> + return true;
Kinda silly after this change, maybe just modify shrink_zone() like
the following?
if (IS_ENABLED(CONFIG_MEMCG)) {
__shrink_zone(zone, sc, true);
if (sc->nr_scanned == nr_scanned)
__shrink_zone(zone, sc, false);
} else {
__shrink_zone(zone, sc, false);
}
> @@ -1974,7 +1974,7 @@ __shrink_zone(struct zone *zone, struct scan_control
> *sc, bool soft_reclaim)
> struct lruvec *lruvec;
>
> if (soft_reclaim &&
> -
> !mem_cgroup_soft_reclaim_eligible(memcg)) {
> +
> !mem_cgroup_soft_reclaim_eligible(memcg, root)) {
Weird indentation which breaks line and goes over 80 col, why not do
the following?
if (soft_reclaim &&
!mem_cgroup_soft_reclaim_eligible(memcg, root)) {
memcg = mem_cgroup_iter(root, memcg, &reclaim);
continue;
}
Thanks.
--
tejun
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