linux-kernel - Re: [RFC PATCH 00/30] Code tagging framework and applications

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Date:   Thu, 8 Sep 2022 09:47:55 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Kent Overstreet <kent.overstreet@...ux.dev>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Mel Gorman <mgorman@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Davidlohr Bueso <dave@...olabs.net>,
        Matthew Wilcox <willy@...radead.org>,
        "Liam R. Howlett" <liam.howlett@...cle.com>,
        David Vernet <void@...ifault.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Peter Xu <peterx@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Jens Axboe <axboe@...nel.dk>, mcgrof@...nel.org,
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        ytcoode@...il.com, Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Benjamin Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
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        jbaron@...mai.com, David Rientjes <rientjes@...gle.com>,
        Minchan Kim <minchan@...gle.com>,
        Kalesh Singh <kaleshsingh@...gle.com>,
        kernel-team <kernel-team@...roid.com>,
        linux-mm <linux-mm@...ck.org>, iommu@...ts.linux.dev,
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        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 00/30] Code tagging framework and applications

On Thu 08-09-22 03:29:50, Kent Overstreet wrote:
> On Thu, Sep 08, 2022 at 09:12:45AM +0200, Michal Hocko wrote:
> > Then you have probably missed a huge part of my emails. Please
> > re-read. If those arguments are not clear, feel free to ask for
> > clarification. Reducing the whole my reasoning and objections to the
> > sentence above and calling that vapid and lazy is not only unfair but
> > also disrespectful.
> 
> What, where you complained about slab's page allocations showing up in the
> profile instead of slab, and I pointed out to you that actually each and every
> slab call is instrumented, and you're just seeing some double counting (that we
> will no doubt fix?)
> 
> Or when you complained about allocation sites where it should actually be the
> caller that should be instrumented, and I pointed out that it'd be quite easy to
> simply change that code to use _kmalloc() and slab_tag_add() directly, if it
> becomes an issue.
> 
> Of course, if we got that far, we'd have this code to thank for telling us where
> to look!
> 
> Did I miss anything?

Feel free to reponse to specific arguments as I wrote them. I won't
repeat them again. Sure we can discuss how important/relevant those
are. And that _can_ be a productive discussion.

-- 
Michal Hocko
SUSE Labs