linux-kernel - Re: [PATCH 0/2] coredump: make SIGNAL_GROUP

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Message-ID: <20150930164026.GA9505@redhat.com>
Date:	Wed, 30 Sep 2015 18:40:26 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	akpm@...ux-foundation.org, rientjes@...gle.com, kwalker@...hat.com,
	mhocko@...nel.org, skozina@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] coredump: make SIGNAL_GROUP_COREDUMP more friendly
	to oom-killer

On 10/01, Tetsuo Handa wrote:
>
> Oleg Nesterov wrote:
> > This patch just makes the SIGNAL_GROUP_COREDUMP check in task_will_free_mem()
> > a bit more correct wrt CLONE_VM tasks, nothing more.
>
> OK. Then, that's out of what I can understand. But I wish for
> some description to PATCH 2/2 about why to change from
> "do { } while_each_thread()" to "for_each_thread() { }"

while_each_thread() is deprecated, see 0c740d0afc

> because they seem to traverse differently.

Not really. And in this particular case (start from group leader)
even the order is the same, although this doesn't matter. Well,
except for_each_thread(p, t) can find no threads, but this is fine
too; this means that they all (including the leader) have exited.

Oleg.

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