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Message-ID: <20190605024454.1393507-5-guro@fb.com>
Date: Tue, 4 Jun 2019 19:44:48 -0700
From: Roman Gushchin <guro@...com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
<kernel-team@...com>, Johannes Weiner <hannes@...xchg.org>,
Shakeel Butt <shakeelb@...gle.com>,
Vladimir Davydov <vdavydov.dev@...il.com>,
Waiman Long <longman@...hat.com>, Roman Gushchin <guro@...com>
Subject: [PATCH v6 04/10] mm: generalize postponed non-root kmem_cache deactivation
Currently SLUB uses a work scheduled after an RCU grace period
to deactivate a non-root kmem_cache. This mechanism can be reused
for kmem_caches release, but requires generalization for SLAB
case.
Introduce kmemcg_cache_deactivate() function, which calls
allocator-specific __kmem_cache_deactivate() and schedules
execution of __kmem_cache_deactivate_after_rcu() with all
necessary locks in a worker context after an rcu grace period.
Here is the new calling scheme:
kmemcg_cache_deactivate()
__kmemcg_cache_deactivate() SLAB/SLUB-specific
kmemcg_rcufn() rcu
kmemcg_workfn() work
__kmemcg_cache_deactivate_after_rcu() SLAB/SLUB-specific
instead of:
__kmemcg_cache_deactivate() SLAB/SLUB-specific
slab_deactivate_memcg_cache_rcu_sched() SLUB-only
kmemcg_rcufn() rcu
kmemcg_workfn() work
kmemcg_cache_deact_after_rcu() SLUB-only
For consistency, all allocator-specific functions start with "__".
Signed-off-by: Roman Gushchin <guro@...com>
---
mm/slab.c | 4 ++++
mm/slab.h | 3 +--
mm/slab_common.c | 27 ++++++++-------------------
mm/slub.c | 8 +-------
4 files changed, 14 insertions(+), 28 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index a4091f8b3655..4b865393ebb4 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2252,6 +2252,10 @@ void __kmemcg_cache_deactivate(struct kmem_cache *cachep)
{
__kmem_cache_shrink(cachep);
}
+
+void __kmemcg_cache_deactivate_after_rcu(struct kmem_cache *s)
+{
+}
#endif
int __kmem_cache_shutdown(struct kmem_cache *cachep)
diff --git a/mm/slab.h b/mm/slab.h
index 8ff90f42548a..d35d85794247 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -172,6 +172,7 @@ int __kmem_cache_shutdown(struct kmem_cache *);
void __kmem_cache_release(struct kmem_cache *);
int __kmem_cache_shrink(struct kmem_cache *);
void __kmemcg_cache_deactivate(struct kmem_cache *s);
+void __kmemcg_cache_deactivate_after_rcu(struct kmem_cache *s);
void slab_kmem_cache_release(struct kmem_cache *);
struct seq_file;
@@ -291,8 +292,6 @@ static __always_inline void memcg_uncharge_slab(struct page *page, int order,
extern void slab_init_memcg_params(struct kmem_cache *);
extern void memcg_link_cache(struct kmem_cache *s, struct mem_cgroup *memcg);
-extern void slab_deactivate_memcg_cache_rcu_sched(struct kmem_cache *s,
- void (*work_fn)(struct kmem_cache *));
#else /* CONFIG_MEMCG_KMEM */
diff --git a/mm/slab_common.c b/mm/slab_common.c
index d019ee66bdc4..09b26673b63f 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -709,7 +709,7 @@ static void kmemcg_workfn(struct work_struct *work)
put_online_mems();
put_online_cpus();
- /* done, put the ref from slab_deactivate_memcg_cache_rcu_sched() */
+ /* done, put the ref from kmemcg_cache_deactivate() */
css_put(&s->memcg_params.memcg->css);
}
@@ -727,31 +727,21 @@ static void kmemcg_rcufn(struct rcu_head *head)
queue_work(memcg_kmem_cache_wq, &s->memcg_params.work);
}
-/**
- * slab_deactivate_memcg_cache_rcu_sched - schedule deactivation after a
- * sched RCU grace period
- * @s: target kmem_cache
- * @work_fn: deactivation function to call
- *
- * Schedule @work_fn to be invoked with online cpus, mems and slab_mutex
- * held after a sched RCU grace period. The slab is guaranteed to stay
- * alive until @work_fn is finished. This is to be used from
- * __kmemcg_cache_deactivate().
- */
-void slab_deactivate_memcg_cache_rcu_sched(struct kmem_cache *s,
- void (*work_fn)(struct kmem_cache *))
+static void kmemcg_cache_deactivate(struct kmem_cache *s)
{
if (WARN_ON_ONCE(is_root_cache(s)) ||
WARN_ON_ONCE(s->memcg_params.work_fn))
return;
+ __kmemcg_cache_deactivate(s);
+
if (s->memcg_params.root_cache->memcg_params.dying)
return;
/* pin memcg so that @s doesn't get destroyed in the middle */
css_get(&s->memcg_params.memcg->css);
- s->memcg_params.work_fn = work_fn;
+ s->memcg_params.work_fn = __kmemcg_cache_deactivate_after_rcu;
call_rcu(&s->memcg_params.rcu_head, kmemcg_rcufn);
}
@@ -774,7 +764,7 @@ void memcg_deactivate_kmem_caches(struct mem_cgroup *memcg)
if (!c)
continue;
- __kmemcg_cache_deactivate(c);
+ kmemcg_cache_deactivate(c);
arr->entries[idx] = NULL;
}
mutex_unlock(&slab_mutex);
@@ -867,11 +857,10 @@ static void flush_memcg_workqueue(struct kmem_cache *s)
mutex_unlock(&slab_mutex);
/*
- * SLUB deactivates the kmem_caches through call_rcu. Make
+ * SLAB and SLUB deactivate the kmem_caches through call_rcu. Make
* sure all registered rcu callbacks have been invoked.
*/
- if (IS_ENABLED(CONFIG_SLUB))
- rcu_barrier();
+ rcu_barrier();
/*
* SLAB and SLUB create memcg kmem_caches through workqueue and SLUB
diff --git a/mm/slub.c b/mm/slub.c
index 9cb2eef62a37..ae3b1e49ecec 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4022,7 +4022,7 @@ int __kmem_cache_shrink(struct kmem_cache *s)
}
#ifdef CONFIG_MEMCG
-static void kmemcg_cache_deact_after_rcu(struct kmem_cache *s)
+void __kmemcg_cache_deactivate_after_rcu(struct kmem_cache *s)
{
/*
* Called with all the locks held after a sched RCU grace period.
@@ -4048,12 +4048,6 @@ void __kmemcg_cache_deactivate(struct kmem_cache *s)
*/
slub_set_cpu_partial(s, 0);
s->min_partial = 0;
-
- /*
- * s->cpu_partial is checked locklessly (see put_cpu_partial), so
- * we have to make sure the change is visible before shrinking.
- */
- slab_deactivate_memcg_cache_rcu_sched(s, kmemcg_cache_deact_after_rcu);
}
#endif /* CONFIG_MEMCG */
--
2.20.1
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