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

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Date:   Fri, 2 Sep 2022 16:05:55 -0400
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Jens Axboe <axboe@...nel.dk>
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,
        masahiroy@...nel.org, nathan@...nel.org, changbin.du@...el.com,
        ytcoode@...il.com, vincent.guittot@...aro.org,
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        bsegall@...gle.com, bristot@...hat.com, vschneid@...hat.com,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>, 42.hyeyoo@...il.com,
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        Muchun Song <songmuchun@...edance.com>, arnd@...db.de,
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        kernel-team@...roid.com, Linux-MM <linux-mm@...ck.org>,
        iommu@...ts.linux.dev, kasan-dev@...glegroups.com,
        io-uring@...r.kernel.org, linux-arch@...r.kernel.org,
        xen-devel@...ts.xenproject.org, linux-bcache@...r.kernel.org,
        linux-modules@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 00/30] Code tagging framework and applications

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.