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From: Shakeel Butt <shakeelb@google.com>
To: Vasily Averin <vvs@virtuozzo.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Michal Hocko <mhocko@kernel.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	kernel@openvz.org, Cgroups <cgroups@vger.kernel.org>
Subject: Re: [PATCH] ipc: remove memcg accounting for sops objects in do_semtimedop()
Date: Sun, 12 Sep 2021 09:05:41 -0700	[thread overview]
Message-ID: <CALvZod5vBkoJ5PpXTW7CCMD9UjMkqK2sQuxK_LXn+W8ddDP5Nw@mail.gmail.com> (raw)
In-Reply-To: <90e254df-0dfe-f080-011e-b7c53ee7fd20@virtuozzo.com>

On Sat, Sep 11, 2021 at 12:40 AM Vasily Averin <vvs@virtuozzo.com> wrote:
>
> Linus proposes to revert an accounting for sops objects in
> do_semtimedop() because it's really just a temporary buffer
> for a single semtimedop() system call.
>
> This object can consume up to 2 pages, syscall is sleeping one,
> size and duration can be controlled by user, and this allocation
> can be repeated by many thread at the same time.
>
> However Shakeel Butt pointed that there are much more popular objects
> with the same life time and similar memory consumption, the accounting
> of which was decided to be rejected for performance reasons.
>
> In addition, any usual task consumes much more accounted memory,
> so 2 pages of this temporal buffer can be safely ignored.
>
> Link: https://patchwork.kernel.org/project/linux-fsdevel/patch/20171005222144.123797-1-shakeelb@google.com/
>
> Fixes: 18319498fdd4 ("memcg: enable accounting of ipc resources")
> Signed-off-by: Vasily Averin <vvs@virtuozzo.com>

Thanks Vasily.

Acked-by: Shakeel Butt <shakeelb@google.com>

WARNING: multiple messages have this Message-ID (diff)
From: Shakeel Butt <shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
To: Vasily Averin <vvs-5HdwGun5lf+gSpxsJD1C4w@public.gmane.org>
Cc: Andrew Morton
	<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	Linus Torvalds
	<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
	kernel-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org,
	Cgroups <cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH] ipc: remove memcg accounting for sops objects in do_semtimedop()
Date: Sun, 12 Sep 2021 09:05:41 -0700	[thread overview]
Message-ID: <CALvZod5vBkoJ5PpXTW7CCMD9UjMkqK2sQuxK_LXn+W8ddDP5Nw@mail.gmail.com> (raw)
In-Reply-To: <90e254df-0dfe-f080-011e-b7c53ee7fd20-5HdwGun5lf+gSpxsJD1C4w@public.gmane.org>

On Sat, Sep 11, 2021 at 12:40 AM Vasily Averin <vvs-5HdwGun5lf+gSpxsJD1C4w@public.gmane.org> wrote:
>
> Linus proposes to revert an accounting for sops objects in
> do_semtimedop() because it's really just a temporary buffer
> for a single semtimedop() system call.
>
> This object can consume up to 2 pages, syscall is sleeping one,
> size and duration can be controlled by user, and this allocation
> can be repeated by many thread at the same time.
>
> However Shakeel Butt pointed that there are much more popular objects
> with the same life time and similar memory consumption, the accounting
> of which was decided to be rejected for performance reasons.
>
> In addition, any usual task consumes much more accounted memory,
> so 2 pages of this temporal buffer can be safely ignored.
>
> Link: https://patchwork.kernel.org/project/linux-fsdevel/patch/20171005222144.123797-1-shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org/
>
> Fixes: 18319498fdd4 ("memcg: enable accounting of ipc resources")
> Signed-off-by: Vasily Averin <vvs-5HdwGun5lf+gSpxsJD1C4w@public.gmane.org>

Thanks Vasily.

Acked-by: Shakeel Butt <shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>

  reply	other threads:[~2021-09-12 16:05 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-11  7:40 [PATCH] ipc: remove memcg accounting for sops objects in do_semtimedop() Vasily Averin
2021-09-11  7:40 ` Vasily Averin
2021-09-12 16:05 ` Shakeel Butt [this message]
2021-09-12 16:05   ` Shakeel Butt
2021-09-13  8:37 ` Michal Hocko
2021-09-13  8:37   ` Michal Hocko
2021-09-14  4:32   ` Shakeel Butt
2021-09-14  4:32     ` Shakeel Butt
2021-09-14  7:13     ` Michal Hocko
2021-09-14  7:13       ` Michal Hocko
2021-09-14 14:23       ` Michal Koutný
2021-09-14 14:23         ` Michal Koutný
2021-09-14 14:32         ` Michal Hocko

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