From: Michal Hocko <mhocko@suse.com>
To: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Suren Baghdasaryan <surenb@google.com>,
mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de,
esyr@redhat.com, christian@kellner.me, areber@redhat.com,
shakeelb@google.com, cyphar@cyphar.com, oleg@redhat.com,
adobriyan@gmail.com, akpm@linux-foundation.org,
ebiederm@xmission.com, gladkov.alexey@gmail.com,
walken@google.com, daniel.m.jordan@oracle.com, avagin@gmail.com,
bernd.edlinger@hotmail.de, john.johansen@canonical.com,
laoar.shao@gmail.com, timmurray@google.com, minchan@kernel.org,
kernel-team@android.com, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 1/1] mm, oom_adj: don't loop through tasks in __set_oom_adj when not necessary
Date: Thu, 20 Aug 2020 13:14:45 +0200 [thread overview]
Message-ID: <20200820111445.GF5033@dhcp22.suse.cz> (raw)
In-Reply-To: <20200820103248.vkzrndewvy5vlncz@wittgenstein>
On Thu 20-08-20 12:32:48, Christian Brauner wrote:
> On Thu, Aug 20, 2020 at 11:09:01AM +0200, Michal Hocko wrote:
> > On Thu 20-08-20 10:46:54, Christian Brauner wrote:
[...]
> > > > which includes processes with multiple threads (sharing mm and signals).
> > > > However for such processes the loop is unnecessary because their signal
> > > > structure is shared as well.
>
> and it seems you want to exclude threads, i.e. only update mm that is
> shared not among threads in the same thread-group.
> But struct signal and struct sighand_struct are different things, i.e.
> they can be shared or not independent of each other. A non-shared
> signal_struct where oom_score_adj{_min} live is only implied by
> !CLONE_THREAD. So shouldn't this be:
>
> if (!(clone_flags & CLONE_THREAD)) rather than CLONE_SIGHAND?
You are right as I have already replied to Oleg.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2020-08-20 11:14 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-20 0:20 Suren Baghdasaryan
2020-08-20 5:56 ` Michal Hocko
2020-08-20 8:46 ` Christian Brauner
2020-08-20 9:09 ` Michal Hocko
2020-08-20 10:32 ` Christian Brauner
2020-08-20 11:14 ` Michal Hocko [this message]
2020-08-20 10:55 ` Oleg Nesterov
2020-08-20 11:13 ` Michal Hocko
2020-08-20 11:29 ` Michal Hocko
2020-08-20 11:41 ` Oleg Nesterov
2020-08-20 11:47 ` Christian Brauner
2020-08-20 11:30 ` Christian Brauner
2020-08-20 11:42 ` Michal Hocko
2020-08-20 12:41 ` Michal Hocko
2020-08-20 13:43 ` Christian Brauner
2020-08-20 12:34 ` Eric W. Biederman
2020-08-20 12:42 ` Michal Hocko
2020-08-20 12:45 ` Eric W. Biederman
2020-08-20 12:54 ` Eric W. Biederman
2020-08-20 13:26 ` Michal Hocko
2020-08-20 13:34 ` Christian Brauner
[not found] ` <dcb62b67-5ad6-f63a-a909-e2fa70b240fc@i-love.sakura.ne.jp>
2020-08-20 14:00 ` Christian Brauner
2020-08-20 14:15 ` Michal Hocko
[not found] ` <42d5645e-0364-c8cd-01dc-93a9aaff5b09@i-love.sakura.ne.jp>
2020-08-20 14:34 ` Michal Hocko
[not found] ` <637ab0e7-e686-0c94-753b-b97d24bb8232@i-love.sakura.ne.jp>
2020-08-20 14:49 ` Eric W. Biederman
2020-08-20 15:06 ` Christian Brauner
2020-08-20 15:56 ` Suren Baghdasaryan
2020-08-20 16:26 ` Michal Hocko
2020-08-20 16:29 ` Christian Brauner
2020-08-20 16:47 ` Suren Baghdasaryan
2020-08-21 4:39 ` Eric W. Biederman
2020-08-21 7:17 ` Michal Hocko
2020-08-21 11:15 ` Oleg Nesterov
2020-08-21 15:28 ` Suren Baghdasaryan
2020-08-21 16:06 ` Suren Baghdasaryan
2020-08-21 16:37 ` Oleg Nesterov
2020-08-21 17:22 ` Suren Baghdasaryan
2020-08-21 16:33 ` Oleg Nesterov
2020-08-21 17:59 ` Oleg Nesterov
2020-08-21 18:53 ` Suren Baghdasaryan
2020-08-24 20:03 ` Suren Baghdasaryan
2020-08-20 13:41 ` Eric W. Biederman
2020-08-20 14:04 ` Oleg Nesterov
2020-08-20 14:36 ` Oleg Nesterov
2020-08-20 15:06 ` Eric W. Biederman
2020-08-20 14:43 ` Eric W. Biederman
2020-08-20 14:12 ` Michal Hocko
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