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Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.1 Subject: Re: [PATCH] tracing: add ACCOUNT flag for allocations from marked slab caches Content-Language: en-US To: Shakeel Butt , Vasily Averin Cc: Roman Gushchin , Andrew Morton , Joonsoo Kim , David Rientjes , Pekka Enberg , Christoph Lameter , kernel@openvz.org, Linux MM , LKML , Michal Hocko , Hyeonggon Yoo <42.hyeyoo@gmail.com> References: <1fd21e25-b095-e055-fc2e-abda640a0575@openvz.org> From: Vlastimil Babka In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 796C940044 X-Stat-Signature: jhozenjpenuip8jhn95u9cp9qigdtomm X-Rspam-User: Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=C4uCBBXf; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=6x2VDOQW; spf=pass (imf12.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none X-HE-Tag: 1652737336-701237 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 5/16/22 21:10, Shakeel Butt wrote: > On Mon, May 16, 2022 at 11:53 AM Vasily Averin wrote: >> >> Slab caches marked with SLAB_ACCOUNT force accounting for every >> allocation from this cache even if __GFP_ACCOUNT flag is not passed. >> Unfortunately, at the moment this flag is not visible in ftrace output, >> and this makes it difficult to analyze the accounted allocations. >> >> This patch adds the __GFP_ACCOUNT flag for allocations from slab caches >> marked with SLAB_ACCOUNT to the ftrace output. >> >> Signed-off-by: Vasily Averin >> --- >> mm/slab.c | 3 +++ >> mm/slub.c | 3 +++ >> 2 files changed, 6 insertions(+) >> >> diff --git a/mm/slab.c b/mm/slab.c >> index 0edb474edef1..4c3da8dfcbdb 100644 >> --- a/mm/slab.c >> +++ b/mm/slab.c >> @@ -3492,6 +3492,9 @@ void *__kmem_cache_alloc_lru(struct kmem_cache *cachep, struct list_lru *lru, > > What about kmem_cache_alloc_node()? > >> { >> void *ret = slab_alloc(cachep, lru, flags, cachep->object_size, _RET_IP_); >> >> + if (cachep->flags & SLAB_ACCOUNT) > > Should this 'if' be unlikely() or should we trace cachep->flags > explicitly to avoid this branch altogether? Hm I think ideally the tracepoint accepts cachep instead of current cachep->*size parameters and does the necessary extraction and modification in its fast_assign. > >> + flags |= __GFP_ACCOUNT; >> + >> trace_kmem_cache_alloc(_RET_IP_, ret, >> cachep->object_size, cachep->size, flags); >> >> diff --git a/mm/slub.c b/mm/slub.c >> index ed5c2c03a47a..670bbfef9e49 100644 >> --- a/mm/slub.c >> +++ b/mm/slub.c >> @@ -3231,6 +3231,9 @@ void *__kmem_cache_alloc_lru(struct kmem_cache *s, struct list_lru *lru, >> { >> void *ret = slab_alloc(s, lru, gfpflags, _RET_IP_, s->object_size); >> >> + if (s->flags & SLAB_ACCOUNT) >> + gfpflags |= __GFP_ACCOUNT; >> + >> trace_kmem_cache_alloc(_RET_IP_, ret, s->object_size, >> s->size, gfpflags); >> >> -- >> 2.25.1 >>