linux-kernel - Re: [PATCH v1 0/5] mm: improve performance of accounted kernel memory allocations

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Date:   Wed, 4 Oct 2023 12:02:25 -0700
From:   Roman Gushchin <roman.gushchin@...ux.dev>
To:     Michal Koutný <mkoutny@...e.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Dennis Zhou <dennis@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Rientjes <rientjes@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH v1 0/5] mm: improve performance of accounted kernel
 memory allocations

On Wed, Oct 04, 2023 at 08:32:39PM +0200, Michal Koutný wrote:
> On Fri, Sep 29, 2023 at 11:00:50AM -0700, Roman Gushchin <roman.gushchin@...ux.dev> wrote:
> > This patchset improves the performance of accounted kernel memory allocations
> > by ~30% as measured by a micro-benchmark [1]. The benchmark is very
> > straightforward: 1M of 64 bytes-large kmalloc() allocations.
> 
> Nice.

Thanks!

> Have you tried how these +34% compose with -34% reported way back [1]
> when file lock accounting was added (because your benchmark and lock1
> sound quite similar)?

No, I haven't. I'm kindly waiting for an automatic report here :)
But if someone can run these tests manually, I'll appreciate it a lot.

> (BTW Is that your motivation (too)?)

Not really, it was on my todo list for a long time and I just got some spare
cycles to figure out missing parts (mostly around targeted/remote charging).

Also plan to try similar approach to speed up generic memcg charging.

Thanks!