From 0e9d92f2d02d8c8320f0502307c688d07bdac2b3 Mon Sep 17 00:00:00 2001 From: Glauber Costa Date: Tue, 18 Dec 2012 14:22:42 -0800 Subject: [PATCH] memcg: skip memcg kmem allocations in specified code regions Create a mechanism that skip memcg allocations during certain pieces of our core code. It basically works in the same way as preempt_disable()/preempt_enable(): By marking a region under which all allocations will be accounted to the root memcg. We need this to prevent races in early cache creation, when we allocate data using caches that are not necessarily created already. Signed-off-by: Glauber Costa yCc: Christoph Lameter Cc: David Rientjes Cc: Frederic Weisbecker Cc: Greg Thelen Cc: Johannes Weiner Cc: JoonSoo Kim Cc: KAMEZAWA Hiroyuki Cc: Mel Gorman Cc: Michal Hocko Cc: Pekka Enberg Cc: Rik van Riel Cc: Suleiman Souhlal Cc: Tejun Heo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/sched.h | 1 + mm/memcontrol.c | 57 ++++++++++++++++++++++++++++++++++++++++--- 2 files changed, 55 insertions(+), 3 deletions(-) diff --git a/include/linux/sched.h b/include/linux/sched.h index 9914c662ed7b..f712465b05c5 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1597,6 +1597,7 @@ struct task_struct { unsigned long nr_pages; /* uncharged usage */ unsigned long memsw_nr_pages; /* uncharged mem+swap usage */ } memcg_batch; + unsigned int memcg_kmem_skip_account; #endif #ifdef CONFIG_HAVE_HW_BREAKPOINT atomic_t ptrace_bp_refcnt; diff --git a/mm/memcontrol.c b/mm/memcontrol.c index efd26620a60b..65302a083d2f 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3025,6 +3025,37 @@ void memcg_release_cache(struct kmem_cache *s) kfree(s->memcg_params); } +/* + * During the creation a new cache, we need to disable our accounting mechanism + * altogether. This is true even if we are not creating, but rather just + * enqueing new caches to be created. + * + * This is because that process will trigger allocations; some visible, like + * explicit kmallocs to auxiliary data structures, name strings and internal + * cache structures; some well concealed, like INIT_WORK() that can allocate + * objects during debug. + * + * If any allocation happens during memcg_kmem_get_cache, we will recurse back + * to it. This may not be a bounded recursion: since the first cache creation + * failed to complete (waiting on the allocation), we'll just try to create the + * cache again, failing at the same point. + * + * memcg_kmem_get_cache is prepared to abort after seeing a positive count of + * memcg_kmem_skip_account. So we enclose anything that might allocate memory + * inside the following two functions. + */ +static inline void memcg_stop_kmem_account(void) +{ + VM_BUG_ON(!current->mm); + current->memcg_kmem_skip_account++; +} + +static inline void memcg_resume_kmem_account(void) +{ + VM_BUG_ON(!current->mm); + current->memcg_kmem_skip_account--; +} + static char *memcg_cache_name(struct mem_cgroup *memcg, struct kmem_cache *s) { char *name; @@ -3084,7 +3115,6 @@ static struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg, goto out; new_cachep = kmem_cache_dup(memcg, cachep); - if (new_cachep == NULL) { new_cachep = cachep; goto out; @@ -3125,8 +3155,8 @@ static void memcg_create_cache_work_func(struct work_struct *w) * Enqueue the creation of a per-memcg kmem_cache. * Called with rcu_read_lock. */ -static void memcg_create_cache_enqueue(struct mem_cgroup *memcg, - struct kmem_cache *cachep) +static void __memcg_create_cache_enqueue(struct mem_cgroup *memcg, + struct kmem_cache *cachep) { struct create_work *cw; @@ -3147,6 +3177,24 @@ static void memcg_create_cache_enqueue(struct mem_cgroup *memcg, schedule_work(&cw->work); } +static void memcg_create_cache_enqueue(struct mem_cgroup *memcg, + struct kmem_cache *cachep) +{ + /* + * We need to stop accounting when we kmalloc, because if the + * corresponding kmalloc cache is not yet created, the first allocation + * in __memcg_create_cache_enqueue will recurse. + * + * However, it is better to enclose the whole function. Depending on + * the debugging options enabled, INIT_WORK(), for instance, can + * trigger an allocation. This too, will make us recurse. Because at + * this point we can't allow ourselves back into memcg_kmem_get_cache, + * the safest choice is to do it like this, wrapping the whole function. + */ + memcg_stop_kmem_account(); + __memcg_create_cache_enqueue(memcg, cachep); + memcg_resume_kmem_account(); +} /* * Return the kmem_cache we're supposed to use for a slab allocation. * We try to use the current memcg's version of the cache. @@ -3169,6 +3217,9 @@ struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep, VM_BUG_ON(!cachep->memcg_params); VM_BUG_ON(!cachep->memcg_params->is_root_cache); + if (!current->mm || current->memcg_kmem_skip_account) + return cachep; + rcu_read_lock(); memcg = mem_cgroup_from_task(rcu_dereference(current->mm->owner)); rcu_read_unlock(); -- GitLab