From mboxrd@z Thu Jan 1 00:00:00 1970 From: Glauber Costa Subject: [PATCH 16/23] slab: provide kmalloc_no_account Date: Sun, 22 Apr 2012 20:53:33 -0300 Message-ID: <1335138820-26590-5-git-send-email-glommer@parallels.com> References: <1334959051-18203-1-git-send-email-glommer@parallels.com> Return-path: In-Reply-To: <1334959051-18203-1-git-send-email-glommer@parallels.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: cgroups@vger.kernel.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, devel@openvz.org, kamezawa.hiroyu@jp.fujitsu.com, Michal Hocko , Johannes Weiner , fweisbec@gmail.com, Greg Thelen , Suleiman Souhlal , Glauber Costa , Christoph Lameter , Pekka Enberg Some allocations need to be accounted to the root memcg regardless of their context. One trivial example, is the allocations we do during the memcg slab cache creation themselves. Strictly speaking, they could go to the parent, but it is way easier to bill them to the root cgroup. Only generic kmalloc allocations are allowed to be bypassed. The function is not exported, because drivers code should always be accounted. This code is mosly written by Suleiman Souhlal. Signed-off-by: Glauber Costa CC: Christoph Lameter CC: Pekka Enberg CC: Michal Hocko CC: Kamezawa Hiroyuki CC: Johannes Weiner CC: Suleiman Souhlal --- include/linux/slab_def.h | 1 + mm/slab.c | 23 +++++++++++++++++++++++ 2 files changed, 24 insertions(+), 0 deletions(-) diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h index 06e4a3e..54d25d7 100644 --- a/include/linux/slab_def.h +++ b/include/linux/slab_def.h @@ -114,6 +114,7 @@ extern struct cache_sizes malloc_sizes[]; void *kmem_cache_alloc(struct kmem_cache *, gfp_t); void *__kmalloc(size_t size, gfp_t flags); +void *kmalloc_no_account(size_t size, gfp_t flags); #ifdef CONFIG_TRACING extern void *kmem_cache_alloc_trace(size_t size, diff --git a/mm/slab.c b/mm/slab.c index c4ef684..13948c3 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3960,6 +3960,29 @@ void *__kmalloc(size_t size, gfp_t flags) } EXPORT_SYMBOL(__kmalloc); +static __always_inline void *__do_kmalloc_no_account(size_t size, gfp_t flags, + void *caller) +{ + struct kmem_cache *cachep; + void *ret; + + cachep = __find_general_cachep(size, flags); + if (unlikely(ZERO_OR_NULL_PTR(cachep))) + return cachep; + + ret = __cache_alloc(cachep, flags, caller); + trace_kmalloc((unsigned long)caller, ret, size, + cachep->buffer_size, flags); + + return ret; +} + +void *kmalloc_no_account(size_t size, gfp_t flags) +{ + return __do_kmalloc_no_account(size, flags, + __builtin_return_address(0)); +} + void *__kmalloc_track_caller(size_t size, gfp_t flags, unsigned long caller) { return __do_kmalloc(size, flags, (void *)caller); -- 1.7.7.6