* + memcg-mark-caches-that-belong-to-offline-memcgs-as-dead.patch added to -mm tree
@ 2014-06-17 21:44 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2014-06-17 21:44 UTC (permalink / raw)
To: mm-commits, rientjes, penberg, mhocko, iamjoonsoo.kim, hannes,
cl, vdavydov
The patch titled
Subject: memcg: mark caches that belong to offline memcgs as dead
has been added to the -mm tree. Its filename is
memcg-mark-caches-that-belong-to-offline-memcgs-as-dead.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/memcg-mark-caches-that-belong-to-offline-memcgs-as-dead.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/memcg-mark-caches-that-belong-to-offline-memcgs-as-dead.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Vladimir Davydov <vdavydov@parallels.com>
Subject: memcg: mark caches that belong to offline memcgs as dead
This will be used by the next patches.
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/slab.h | 2 ++
mm/memcontrol.c | 3 +++
mm/slab.h | 25 +++++++++++++++++++++++++
3 files changed, 30 insertions(+)
diff -puN include/linux/slab.h~memcg-mark-caches-that-belong-to-offline-memcgs-as-dead include/linux/slab.h
--- a/include/linux/slab.h~memcg-mark-caches-that-belong-to-offline-memcgs-as-dead
+++ a/include/linux/slab.h
@@ -527,6 +527,7 @@ static __always_inline void *kmalloc_nod
* @list: list_head for the list of all caches in this memcg
* @root_cache: pointer to the global, root cache, this cache was derived from
* @refcnt: reference counter
+ * @dead: set to true when owner memcg is turned offline
* @unregister_work: worker to destroy the cache
*/
struct memcg_cache_params {
@@ -541,6 +542,7 @@ struct memcg_cache_params {
struct list_head list;
struct kmem_cache *root_cache;
atomic_long_t refcnt;
+ bool dead;
struct work_struct unregister_work;
};
};
diff -puN mm/memcontrol.c~memcg-mark-caches-that-belong-to-offline-memcgs-as-dead mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-mark-caches-that-belong-to-offline-memcgs-as-dead
+++ a/mm/memcontrol.c
@@ -3256,7 +3256,10 @@ static void memcg_unregister_all_caches(
mutex_lock(&memcg_slab_mutex);
list_for_each_entry_safe(params, tmp, &memcg->memcg_slab_caches, list) {
cachep = memcg_params_to_cache(params);
+
+ memcg_cache_mark_dead(cachep);
kmem_cache_shrink(cachep);
+
if (atomic_long_dec_and_test(&cachep->memcg_params->refcnt))
memcg_unregister_cache(cachep);
}
diff -puN mm/slab.h~memcg-mark-caches-that-belong-to-offline-memcgs-as-dead mm/slab.h
--- a/mm/slab.h~memcg-mark-caches-that-belong-to-offline-memcgs-as-dead
+++ a/mm/slab.h
@@ -121,6 +121,26 @@ static inline bool is_root_cache(struct
return !s->memcg_params || s->memcg_params->is_root_cache;
}
+static inline bool memcg_cache_dead(struct kmem_cache *s)
+{
+ if (is_root_cache(s))
+ return false;
+
+ /*
+ * Since this function can be called without holding any locks, it
+ * needs a barrier here to guarantee the read won't be reordered.
+ */
+ smp_rmb();
+ return s->memcg_params->dead;
+}
+
+static inline void memcg_cache_mark_dead(struct kmem_cache *s)
+{
+ BUG_ON(is_root_cache(s));
+ s->memcg_params->dead = true;
+ smp_wmb(); /* matches rmb in memcg_cache_dead() */
+}
+
static inline bool slab_equal_or_root(struct kmem_cache *s,
struct kmem_cache *p)
{
@@ -203,6 +223,11 @@ static inline bool is_root_cache(struct
return true;
}
+static inline bool memcg_cache_dead(struct kmem_cache *s)
+{
+ return false;
+}
+
static inline bool slab_equal_or_root(struct kmem_cache *s,
struct kmem_cache *p)
{
_
Patches currently in -mm which might be from vdavydov@parallels.com are
slab-fix-oops-when-reading-proc-slab_allocators.patch
memcg-cleanup-memcg_cache_params-refcnt-usage.patch
memcg-destroy-kmem-caches-when-last-slab-is-freed.patch
memcg-mark-caches-that-belong-to-offline-memcgs-as-dead.patch
slub-dont-fail-kmem_cache_shrink-if-slab-placement-optimization-fails.patch
slub-make-slab_free-non-preemptable.patch
memcg-wait-for-kfrees-to-finish-before-destroying-cache.patch
slub-make-dead-memcg-caches-discard-free-slabs-immediately.patch
slab-do-not-keep-free-objects-slabs-on-dead-memcg-caches.patch
linux-next.patch
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2014-06-17 21:44 + memcg-mark-caches-that-belong-to-offline-memcgs-as-dead.patch added to -mm tree akpm
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