linux-kernel - Re: [PATCH v5] tracing: add 'accounted' entry into output of allocation tracepoints

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Message-ID: <c1676616-1405-5bcb-af02-c1e9cc83dace@openvz.org>
Date:   Tue, 31 May 2022 19:58:18 +0300
From:   Vasily Averin <vvs@...nvz.org>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc:     Vlastimil Babka <vbabka@...e.cz>, kernel@...nvz.org,
        linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Matthew Wilcox <willy@...radead.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>,
        Muchun Song <songmuchun@...edance.com>
Subject: Re: [PATCH v5] tracing: add 'accounted' entry into output of
 allocation tracepoints

On 5/31/22 14:46, Hyeonggon Yoo wrote:
> On Mon, May 30, 2022 at 10:47:26AM +0300, Vasily Averin wrote:
> Looks good to me.
> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@...il.com>
> 
> a small comment:
>>  
>>  	TP_fast_assign(
>> @@ -33,42 +35,46 @@ DECLARE_EVENT_CLASS(kmem_alloc,
>>  		__entry->bytes_req	= bytes_req;
>>  		__entry->bytes_alloc	= bytes_alloc;
>>  		__entry->gfp_flags	= (__force unsigned long)gfp_flags;
>> +		__entry->accounted	= (gfp_flags & __GFP_ACCOUNT) ||
>> +					  (s && s->flags & SLAB_ACCOUNT);
>>  	),
>>  
> 
> It doesn't make sense for SLOB to print accounted=true because SLOB does
> not support object accounting.

Thank you very much for this comment.
SLAB_ACCOUNT is not defined for SLOB, but __GFP_ACCOUNT really can incorrectly 
set this field to true.
I'll think how to handle this correctly.

Thank you,
	Vasily Averin