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Message-ID: <9a4a9afe-bbe1-4cb3-713b-f1e4e6d2a049@suse.cz>
Date:   Wed, 15 Jun 2022 11:41:48 +0200
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Subject: Re: [PATCH mm v6] mm/tracing: add 'accounted' entry into output of
 allocation tracepoints
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To:     Vasily Averin <vvs@openvz.org>
Cc:     kernel@openvz.org, linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        Shakeel Butt <shakeelb@google.com>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        =?UTF-8?Q?Michal_Koutn=c3=bd?= <mkoutny@suse.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ingo Molnar <mingo@redhat.com>, Michal Hocko <mhocko@suse.com>,
        Muchun Song <songmuchun@bytedance.com>,
        Hyeonggon Yoo <42.hyeyoo@gmail.com>,
        Matthew Wilcox <willy@infradead.org>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        David Rientjes <rientjes@google.com>,
        Pekka Enberg <penberg@kernel.org>,
        Christoph Lameter <cl@linux.com>, cgroups@vger.kernel.org
References: <c1676616-1405-5bcb-af02-c1e9cc83dace@openvz.org>
 <c418ed25-65fe-f623-fbf8-1676528859ed@openvz.org>
From:   Vlastimil Babka <vbabka@suse.cz>
In-Reply-To: <c418ed25-65fe-f623-fbf8-1676528859ed@openvz.org>
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Precedence: bulk

On 6/3/22 05:21, 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 boolean "accounted" entry into trace output,
> and set it to 'true' for calls used __GFP_ACCOUNT flag and
> for allocations from caches marked with SLAB_ACCOUNT.
> Set it to 'false' if accounting is disabled in configs.
> 
> Signed-off-by: Vasily Averin <vvs@openvz.org>
> Acked-by: Shakeel Butt <shakeelb@google.com>
> Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
> Acked-by: Muchun Song <songmuchun@bytedance.com>
> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>

Thanks, added to slab/for-5.20/tracing

> 
> ---
> v6:
>  1) subject changed from "tracing:" to "mm/tracing:"
>  2) set flag to 'false' if accounting is disabled in configs

Looks like you forgot the kmem_alloc_node variant, fixed up locally:

--- a/include/trace/events/kmem.h
+++ b/include/trace/events/kmem.h
@@ -94,8 +94,9 @@ DECLARE_EVENT_CLASS(kmem_alloc_node,
                __entry->bytes_alloc    = bytes_alloc;
                __entry->gfp_flags      = (__force unsigned long)gfp_flags;
                __entry->node           = node;
-               __entry->accounted      = (gfp_flags & __GFP_ACCOUNT) ||
-                                         (s && s->flags & SLAB_ACCOUNT);
+               __entry->accounted      = IS_ENABLED(CONFIG_MEMCG_KMEM) ?
+                                         ((gfp_flags & __GFP_ACCOUNT) ||
+                                         (s && s->flags & SLAB_ACCOUNT)) : false;
        ),
 
        TP_printk("call_site=%pS ptr=%p bytes_req=%zu bytes_alloc=%zu gfp_flags=%s node=%d accounted=%s",