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

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Message-ID: <20220519123255.543b8db6@gandalf.local.home>
Date:   Thu, 19 May 2022 12:32:55 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Vasily Averin <vvs@...nvz.org>
Cc:     YoPOhRctb8wwbmY5@...bon, 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>, 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 Thu, 19 May 2022 19:29:36 +0300
Vasily Averin <vvs@...nvz.org> wrote:

> Frankly speaking I vote for performance with both hands.
> However I'm still would like to avoid new sparse warnings.
> Christoph Hellwig just recently taught me, "never add '__force' before
> thinking hard about them", but in this case I would need to use it three times.
> 
> I found that bitwise typecasts can be avoided by using translation unions. 
> 
> What do you think about following trick?

It's really up to you memory management folks. Although I may need to
update libtraceevent to handle the union case. That may be a bit tricky.

-- Steve