@@ -16,6 +16,7 @@
#include <linux/overflow.h>
#include <linux/types.h>
#include <linux/workqueue.h>
+#include <linux/percpu-refcount.h>
/*
@@ -152,7 +153,6 @@ int kmem_cache_shrink(struct kmem_cache *);
void memcg_create_kmem_cache(struct mem_cgroup *, struct kmem_cache *);
void memcg_deactivate_kmem_caches(struct mem_cgroup *);
-void memcg_destroy_kmem_caches(struct mem_cgroup *);
/*
* Please use this macro to create slab caches. Simply specify the
@@ -641,6 +641,7 @@ struct memcg_cache_params {
struct mem_cgroup *memcg;
struct list_head children_node;
struct list_head kmem_caches_node;
+ struct percpu_ref refcnt;
void (*work_fn)(struct kmem_cache *);
union {
@@ -2591,12 +2591,13 @@ static void memcg_schedule_kmem_cache_create(struct mem_cgroup *memcg,
{
struct memcg_kmem_cache_create_work *cw;
+ if (!css_tryget_online(&memcg->css))
+ return;
+
cw = kmalloc(sizeof(*cw), GFP_NOWAIT | __GFP_NOWARN);
if (!cw)
return;
- css_get(&memcg->css);
-
cw->memcg = memcg;
cw->cachep = cachep;
INIT_WORK(&cw->work, memcg_kmem_cache_create_func);
@@ -2631,6 +2632,7 @@ struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep)
{
struct mem_cgroup *memcg;
struct kmem_cache *memcg_cachep;
+ struct memcg_cache_array *arr;
int kmemcg_id;
VM_BUG_ON(!is_root_cache(cachep));
@@ -2638,14 +2640,29 @@ struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep)
if (memcg_kmem_bypass())
return cachep;
- memcg = get_mem_cgroup_from_current();
+ rcu_read_lock();
+
+ if (unlikely(current->active_memcg))
+ memcg = current->active_memcg;
+ else
+ memcg = mem_cgroup_from_task(current);
+
+ if (!memcg || memcg == root_mem_cgroup)
+ goto out_unlock;
+
kmemcg_id = READ_ONCE(memcg->kmemcg_id);
if (kmemcg_id < 0)
- goto out;
+ goto out_unlock;
+
+ arr = rcu_dereference(cachep->memcg_params.memcg_caches);
- memcg_cachep = cache_from_memcg_idx(cachep, kmemcg_id);
- if (likely(memcg_cachep))
- return memcg_cachep;
+ /*
+ * Make sure we will access the up-to-date value. The code updating
+ * memcg_caches issues a write barrier to match this (see
+ * memcg_create_kmem_cache()).
+ */
+ smp_rmb();
+ memcg_cachep = READ_ONCE(arr->entries[kmemcg_id]);
/*
* If we are in a safe context (can wait, and not in interrupt
@@ -2658,10 +2675,20 @@ struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep)
* memcg_create_kmem_cache, this means no further allocation
* could happen with the slab_mutex held. So it's better to
* defer everything.
+ *
+ * If the memcg is dying or memcg_cache is about to be released,
+ * don't bother creating new kmem_caches. Because memcg_cachep
+ * is ZEROed as the fist step of kmem offlining, we don't need
+ * percpu_ref_tryget_live() here. css_tryget_online() check in
+ * memcg_schedule_kmem_cache_create() will prevent us from
+ * creation of a new kmem_cache.
*/
- memcg_schedule_kmem_cache_create(memcg, cachep);
-out:
- css_put(&memcg->css);
+ if (unlikely(!memcg_cachep))
+ memcg_schedule_kmem_cache_create(memcg, cachep);
+ else if (percpu_ref_tryget(&memcg_cachep->memcg_params.refcnt))
+ cachep = memcg_cachep;
+out_unlock:
+ rcu_read_unlock();
return cachep;
}
@@ -2672,7 +2699,7 @@ struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep)
void memcg_kmem_put_cache(struct kmem_cache *cachep)
{
if (!is_root_cache(cachep))
- css_put(&cachep->memcg_params.memcg->css);
+ percpu_ref_put(&cachep->memcg_params.refcnt);
}
/**
@@ -3219,7 +3246,7 @@ static void memcg_free_kmem(struct mem_cgroup *memcg)
memcg_offline_kmem(memcg);
if (memcg->kmem_state == KMEM_ALLOCATED) {
- memcg_destroy_kmem_caches(memcg);
+ WARN_ON(!list_empty(&memcg->kmem_caches));
static_branch_dec(&memcg_kmem_enabled_key);
WARN_ON(page_counter_read(&memcg->kmem));
}
@@ -248,32 +248,6 @@ static inline const char *cache_name(struct kmem_cache *s)
return s->name;
}
-/*
- * Note, we protect with RCU only the memcg_caches array, not per-memcg caches.
- * That said the caller must assure the memcg's cache won't go away by either
- * taking a css reference to the owner cgroup, or holding the slab_mutex.
- */
-static inline struct kmem_cache *
-cache_from_memcg_idx(struct kmem_cache *s, int idx)
-{
- struct kmem_cache *cachep;
- struct memcg_cache_array *arr;
-
- rcu_read_lock();
- arr = rcu_dereference(s->memcg_params.memcg_caches);
-
- /*
- * Make sure we will access the up-to-date value. The code updating
- * memcg_caches issues a write barrier to match this (see
- * memcg_create_kmem_cache()).
- */
- smp_rmb();
- cachep = READ_ONCE(arr->entries[idx]);
- rcu_read_unlock();
-
- return cachep;
-}
-
static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
{
if (is_root_cache(s))
@@ -285,14 +259,25 @@ static __always_inline int memcg_charge_slab(struct page *page,
gfp_t gfp, int order,
struct kmem_cache *s)
{
+ int ret;
+
if (is_root_cache(s))
return 0;
- return memcg_kmem_charge_memcg(page, gfp, order, s->memcg_params.memcg);
+
+ ret = memcg_kmem_charge_memcg(page, gfp, order, s->memcg_params.memcg);
+ if (ret)
+ return ret;
+
+ percpu_ref_get_many(&s->memcg_params.refcnt, 1 << order);
+
+ return 0;
}
static __always_inline void memcg_uncharge_slab(struct page *page, int order,
struct kmem_cache *s)
{
+ if (!is_root_cache(s))
+ percpu_ref_put_many(&s->memcg_params.refcnt, 1 << order);
memcg_kmem_uncharge(page, order);
}
@@ -324,12 +309,6 @@ static inline const char *cache_name(struct kmem_cache *s)
return s->name;
}
-static inline struct kmem_cache *
-cache_from_memcg_idx(struct kmem_cache *s, int idx)
-{
- return NULL;
-}
-
static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
{
return s;
@@ -132,6 +132,8 @@ int __kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t nr,
LIST_HEAD(slab_root_caches);
static DEFINE_SPINLOCK(memcg_kmem_wq_lock);
+static void kmemcg_cache_shutdown(struct percpu_ref *percpu_ref);
+
void slab_init_memcg_params(struct kmem_cache *s)
{
s->memcg_params.root_cache = NULL;
@@ -146,6 +148,12 @@ static int init_memcg_params(struct kmem_cache *s,
struct memcg_cache_array *arr;
if (root_cache) {
+ int ret = percpu_ref_init(&s->memcg_params.refcnt,
+ kmemcg_cache_shutdown,
+ 0, GFP_KERNEL);
+ if (ret)
+ return ret;
+
s->memcg_params.root_cache = root_cache;
INIT_LIST_HEAD(&s->memcg_params.children_node);
INIT_LIST_HEAD(&s->memcg_params.kmem_caches_node);
@@ -171,6 +179,8 @@ static void destroy_memcg_params(struct kmem_cache *s)
{
if (is_root_cache(s))
kvfree(rcu_access_pointer(s->memcg_params.memcg_caches));
+ else
+ percpu_ref_exit(&s->memcg_params.refcnt);
}
static void free_memcg_params(struct rcu_head *rcu)
@@ -226,6 +236,7 @@ void memcg_link_cache(struct kmem_cache *s, struct mem_cgroup *memcg)
if (is_root_cache(s)) {
list_add(&s->root_caches_node, &slab_root_caches);
} else {
+ css_get(&memcg->css);
s->memcg_params.memcg = memcg;
list_add(&s->memcg_params.children_node,
&s->memcg_params.root_cache->memcg_params.children);
@@ -241,6 +252,7 @@ static void memcg_unlink_cache(struct kmem_cache *s)
} else {
list_del(&s->memcg_params.children_node);
list_del(&s->memcg_params.kmem_caches_node);
+ css_put(&s->memcg_params.memcg->css);
}
}
#else
@@ -686,7 +698,7 @@ void memcg_create_kmem_cache(struct mem_cgroup *memcg,
}
/*
- * Since readers won't lock (see cache_from_memcg_idx()), we need a
+ * Since readers won't lock (see memcg_kmem_get_cache()), we need a
* barrier here to ensure nobody will see the kmem_cache partially
* initialized.
*/
@@ -711,14 +723,12 @@ static void kmemcg_workfn(struct work_struct *work)
mutex_lock(&slab_mutex);
s->memcg_params.work_fn(s);
+ s->memcg_params.work_fn = NULL;
mutex_unlock(&slab_mutex);
put_online_mems();
put_online_cpus();
-
- /* done, put the ref from kmemcg_cache_deactivate() */
- css_put(&s->memcg_params.memcg->css);
}
static void kmemcg_rcufn(struct rcu_head *head)
@@ -735,10 +745,39 @@ static void kmemcg_rcufn(struct rcu_head *head)
queue_work(memcg_kmem_cache_wq, &s->memcg_params.work);
}
+static void kmemcg_cache_shutdown_fn(struct kmem_cache *s)
+{
+ WARN_ON(shutdown_cache(s));
+}
+
+static void kmemcg_cache_shutdown(struct percpu_ref *percpu_ref)
+{
+ struct kmem_cache *s = container_of(percpu_ref, struct kmem_cache,
+ memcg_params.refcnt);
+ unsigned long flags;
+
+ spin_lock_irqsave(&memcg_kmem_wq_lock, flags);
+ if (s->memcg_params.root_cache->memcg_params.dying)
+ goto unlock;
+
+ WARN_ON(s->memcg_params.work_fn);
+ s->memcg_params.work_fn = kmemcg_cache_shutdown_fn;
+ INIT_WORK(&s->memcg_params.work, kmemcg_workfn);
+ queue_work(memcg_kmem_cache_wq, &s->memcg_params.work);
+
+unlock:
+ spin_unlock_irqrestore(&memcg_kmem_wq_lock, flags);
+}
+
+static void kmemcg_cache_deactivate_after_rcu(struct kmem_cache *s)
+{
+ __kmemcg_cache_deactivate_after_rcu(s);
+ percpu_ref_kill(&s->memcg_params.refcnt);
+}
+
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))
+ if (WARN_ON_ONCE(is_root_cache(s)))
return;
__kmemcg_cache_deactivate(s);
@@ -747,10 +786,8 @@ static void kmemcg_cache_deactivate(struct kmem_cache *s)
if (s->memcg_params.root_cache->memcg_params.dying)
goto unlock;
- /* pin memcg so that @s doesn't get destroyed in the middle */
- css_get(&s->memcg_params.memcg->css);
-
- s->memcg_params.work_fn = __kmemcg_cache_deactivate_after_rcu;
+ WARN_ON_ONCE(s->memcg_params.work_fn);
+ s->memcg_params.work_fn = kmemcg_cache_deactivate_after_rcu;
call_rcu(&s->memcg_params.rcu_head, kmemcg_rcufn);
unlock:
spin_unlock_irq(&memcg_kmem_wq_lock);
@@ -784,28 +821,6 @@ void memcg_deactivate_kmem_caches(struct mem_cgroup *memcg)
put_online_cpus();
}
-void memcg_destroy_kmem_caches(struct mem_cgroup *memcg)
-{
- struct kmem_cache *s, *s2;
-
- get_online_cpus();
- get_online_mems();
-
- mutex_lock(&slab_mutex);
- list_for_each_entry_safe(s, s2, &memcg->kmem_caches,
- memcg_params.kmem_caches_node) {
- /*
- * The cgroup is about to be freed and therefore has no charges
- * left. Hence, all its caches must be empty by now.
- */
- BUG_ON(shutdown_cache(s));
- }
- mutex_unlock(&slab_mutex);
-
- put_online_mems();
- put_online_cpus();
-}
-
static int shutdown_memcg_caches(struct kmem_cache *s)
{
struct memcg_cache_array *arr;
Currently each charged slab page holds a reference to the cgroup to which it's charged. Kmem_caches are held by the memcg and are released all together with the memory cgroup. It means that none of kmem_caches are released unless at least one reference to the memcg exists, which is very far from optimal. Let's rework it in a way that allows releasing individual kmem_caches as soon as the cgroup is offline, the kmem_cache is empty and there are no pending allocations. To make it possible, let's introduce a new percpu refcounter for non-root kmem caches. The counter is initialized to the percpu mode, and is switched to the atomic mode during kmem_cache deactivation. The counter is bumped for every charged page and also for every running allocation. So the kmem_cache can't be released unless all allocations complete. To shutdown non-active empty kmem_caches, let's reuse the work queue, previously used for the kmem_cache deactivation. Once the reference counter reaches 0, let's schedule an asynchronous kmem_cache release. * I used the following simple approach to test the performance (stolen from another patchset by T. Harding): time find / -name fname-no-exist echo 2 > /proc/sys/vm/drop_caches repeat 10 times Results: orig patched real 0m1.455s real 0m1.355s user 0m0.206s user 0m0.219s sys 0m0.855s sys 0m0.807s real 0m1.487s real 0m1.699s user 0m0.221s user 0m0.256s sys 0m0.806s sys 0m0.948s real 0m1.515s real 0m1.505s user 0m0.183s user 0m0.215s sys 0m0.876s sys 0m0.858s real 0m1.291s real 0m1.380s user 0m0.193s user 0m0.198s sys 0m0.843s sys 0m0.786s real 0m1.364s real 0m1.374s user 0m0.180s user 0m0.182s sys 0m0.868s sys 0m0.806s real 0m1.352s real 0m1.312s user 0m0.201s user 0m0.212s sys 0m0.820s sys 0m0.761s real 0m1.302s real 0m1.349s user 0m0.205s user 0m0.203s sys 0m0.803s sys 0m0.792s real 0m1.334s real 0m1.301s user 0m0.194s user 0m0.201s sys 0m0.806s sys 0m0.779s real 0m1.426s real 0m1.434s user 0m0.216s user 0m0.181s sys 0m0.824s sys 0m0.864s real 0m1.350s real 0m1.295s user 0m0.200s user 0m0.190s sys 0m0.842s sys 0m0.811s So it looks like the difference is not noticeable in this test. Signed-off-by: Roman Gushchin <guro@fb.com> --- include/linux/slab.h | 3 +- mm/memcontrol.c | 51 +++++++++++++++++++++------- mm/slab.h | 45 +++++++------------------ mm/slab_common.c | 79 ++++++++++++++++++++++++++------------------ 4 files changed, 100 insertions(+), 78 deletions(-)