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

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Message-ID: <002ab1f2-078e-2bce-83a0-257a573b1f95@kernel.dk>
Date:   Fri, 2 Sep 2022 14:23:34 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Kent Overstreet <kent.overstreet@...ux.dev>
Cc:     Roman Gushchin <roman.gushchin@...ux.dev>,
        Yosry Ahmed <yosryahmed@...gle.com>,
        Michal Hocko <mhocko@...e.com>, Mel Gorman <mgorman@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Johannes Weiner <hannes@...xchg.org>, dave@...olabs.net,
        Matthew Wilcox <willy@...radead.org>, liam.howlett@...cle.com,
        void@...ifault.com, juri.lelli@...hat.com, ldufour@...ux.ibm.com,
        Peter Xu <peterx@...hat.com>,
        David Hildenbrand <david@...hat.com>, mcgrof@...nel.org,
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        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 00/30] Code tagging framework and applications

On 9/2/22 2:05 PM, Kent Overstreet wrote:
> On Fri, Sep 02, 2022 at 01:53:53PM -0600, Jens Axboe wrote:
>> I've complained about memcg accounting before, the slowness of it is why
>> io_uring works around it by caching. Anything we account we try NOT do
>> in the fast path because of it, the slowdown is considerable.
> 
> I'm with you on that, it definitely raises an eyebrow.
> 
>> You care about efficiency now? I thought that was relegated to
>> irrelevant 10M IOPS cases.
> 
> I always did, it's just not the only thing I care about.

It's not the only thing anyone cares about.

-- 
Jens Axboe