| Date | Sat, 25 Jun 2022 21:17:38 -0700 | From | "Paul E. McKenney" <> | Subject | Re: [PATCH v2 8/8] rcu/kfree: Fix kfree_rcu_shrink_count() return value |
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On Wed, Jun 22, 2022 at 10:51:02PM +0000, Joel Fernandes (Google) wrote: > As per the comments in include/linux/shrinker.h, .count_objects callback > should return the number of freeable items, but if there are no objects > to free, SHRINK_EMPTY should be returned. The only time 0 is returned > should be when we are unable to determine the number of objects, or the > cache should be skipped for another reason.
Good catch!
Thanx, Paul
> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> > --- > kernel/rcu/tree.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c > index 711679d10cbb..935788e8d2d7 100644 > --- a/kernel/rcu/tree.c > +++ b/kernel/rcu/tree.c > @@ -3722,7 +3722,7 @@ kfree_rcu_shrink_count(struct shrinker *shrink, struct shrink_control *sc) > atomic_set(&krcp->backoff_page_cache_fill, 1); > } > > - return count; > + return count == 0 ? SHRINK_EMPTY : count; > } > > static unsigned long > -- > 2.37.0.rc0.104.g0611611a94-goog >
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