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slab: Replace synchronize_sched() with synchronize_rcu() 

Now that synchronize_rcu() waits for preempt-disable regions of code
as well as RCU read-side critical sections, synchronize_sched() can be
replaced by synchronize_rcu().  This commit therefore makes this change.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: <linux-mm@kvack.org>
This commit is contained in:
Paul E. McKenney 2018-11-06 19:24:33 -08:00
parent 36bd1a8e91
commit 6564a25e6c
2 changed files with 5 additions and 5 deletions
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4
mm/slab.c
View File

@ -962,10 +962,10 @@ static int setup_kmem_cache_node(struct kmem_cache *cachep,
* To protect lockless access to n->shared during irq disabled context.
* If n->shared isn't NULL in irq disabled context, accessing to it is
* guaranteed to be valid until irq is re-enabled, because it will be
* freed after synchronize_sched().
* freed after synchronize_rcu().
*/
if (old_shared && force_change)
synchronize_sched();
synchronize_rcu();
fail:
kfree(old_shared);

6
mm/slab_common.c
View File

@ -724,7 +724,7 @@ void slab_deactivate_memcg_cache_rcu_sched(struct kmem_cache *s,
css_get(&s->memcg_params.memcg->css);
s->memcg_params.deact_fn = deact_fn;
call_rcu_sched(&s->memcg_params.deact_rcu_head, kmemcg_deactivate_rcufn);
call_rcu(&s->memcg_params.deact_rcu_head, kmemcg_deactivate_rcufn);
}
void memcg_deactivate_kmem_caches(struct mem_cgroup *memcg)
@ -839,11 +839,11 @@ static void flush_memcg_workqueue(struct kmem_cache *s)
mutex_unlock(&slab_mutex);
/*
* SLUB deactivates the kmem_caches through call_rcu_sched. Make
* SLUB deactivates the kmem_caches through call_rcu. Make
* sure all registered rcu callbacks have been invoked.
*/
if (IS_ENABLED(CONFIG_SLUB))
rcu_barrier_sched();
rcu_barrier();
/*
* SLAB and SLUB create memcg kmem_caches through workqueue and SLUB