linux-kernel - Re: [PATCH v3] tracing: add 'accounted' entry into output of allocation tracepoints

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Date:   Wed, 18 May 2022 18:45:04 +0300
From:   Vasily Averin <vvs@...nvz.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Muchun Song <songmuchun@...edance.com>
Cc:     kernel@...nvz.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        David Rientjes <rientjes@...gle.com>,
        Pekka Enberg <penberg@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH v3] tracing: add 'accounted' entry into output of
 allocation tracepoints

On 5/18/22 09:24, 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 "allocated" entry into trace output,

not "allocated" but "accounted"

> and set it to 'true' for calls used __GFP_ACCOUNT flag and
> for allocations from caches marked with SLAB_ACCOUNT.
> 
> Signed-off-by: Vasily Averin <vvs@...nvz.org>