linux-kernel - Re: [PATCH v4] tracing: add 'accounted' entry into output of allocation tracepoints

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Date:   Sat, 21 May 2022 22:42:10 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc:     Vasily Averin <vvs@...nvz.org>,
        Andrew Morton <akpm@...ux-foundation.org>, kernel@...nvz.org,
        LKML <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, Linux MM <linux-mm@...ck.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Vlastimil Babka <vbabka@...e.cz>,
        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 v4] tracing: add 'accounted' entry into output of
 allocation tracepoints

On Sat, May 21, 2022 at 10:19 PM Hyeonggon Yoo <42.hyeyoo@...il.com> wrote:
>
[...]
>
> No strong opinion but just a concern that maybe later someone want add
> something similar like 'reclaimable=true/false', 'dma=true/false', ...
> and I would prefer more general solution. (especially if we'll not
> change tracepoints after release because of backward compatibility)
>

There is no contract for tracepoints to be stable and can be changed.

> > For my task it's not important to know SLAB flags, I just need to understand,
> > is current allocation accounted or not.
>
> SLAB_ACCOUNT, SLAB_RECLAIM_ACCOUNT, SLAB_DMA, ... etc are SLAB flags.
>
> 'if current allocation is accounted or not' depends on SLAB_ACCOUNT
> flag is set or not.
>

allocation can be accounted due to __GFP_ACCOUNT as well.