linux-kernel - Re: [memcg] 0f12156dff: will-it-scale.per_process

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Message-ID: <dbc9955d-6c28-1dd5-b842-ef39a762aa3b@kernel.dk>
Date:   Tue, 7 Sep 2021 09:46:48 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     kernel test robot <oliver.sang@...el.com>,
        Vasily Averin <vvs@...tuozzo.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrei Vagin <avagin@...il.com>,
        Borislav Petkov <bp@...en8.de>, Borislav Petkov <bp@...e.de>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Jeff Layton <jlayton@...nel.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Michal Hocko <mhocko@...nel.org>,
        Oleg Nesterov <oleg@...hat.com>, Roman Gushchin <guro@...com>,
        Serge Hallyn <serge@...lyn.com>, Tejun Heo <tj@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Yutian Yang <nglaive@...il.com>,
        Zefan Li <lizefan.x@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com, ying.huang@...el.com, feng.tang@...el.com,
        zhengjun.xing@...ux.intel.com
Subject: Re: [memcg] 0f12156dff: will-it-scale.per_process_ops -33.6%
 regression

On 9/7/21 9:07 AM, kernel test robot wrote:
> 
> 
> Greeting,
> 
> FYI, we noticed a -33.6% regression of will-it-scale.per_process_ops due to commit:
> 
> 
> commit: 0f12156dff2862ac54235fc72703f18770769042 ("memcg: enable accounting for file lock caches")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

Are we at all worried about these? There's been a number of them
reported, basically for all the accounting enablements that have been
done in this merge window.

When io_uring was switched to use accounted memory, we did a bunch of
work to ameliorate the inevitable slowdowns that happen if you do
repeated allocs and/or frees and have memcg accounting enabled.

-- 
Jens Axboe