linux-kernel - oom-kill && frozen()

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Message-ID: <20131112165643.GA31278@redhat.com>
Date:	Tue, 12 Nov 2013 17:56:43 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>, Tejun Heo <tj@...nel.org>,
	David Rientjes <rientjes@...gle.com>
Cc:	David Laight <David.Laight@...LAB.COM>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Ingo Molnar <mingo@...nel.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: oom-kill && frozen()

On 11/12, Oleg Nesterov wrote:
>
> I am also wondering if it makes any sense to turn PF_FROZEN into
> TASK_FROZEN, something like (incomplete, probably racy) patch below.
> Note that it actually adds the new state, not the the qualifier.

As for the current usage of PF_FROZEN... David, it seems that
oom_scan_process_thread()->__thaw_task() is dead? Probably this
was fine before, when __thaw_task() cleared the "need to freeze"
condition, iirc it was PF_FROZEN.

But today __thaw_task() can't help, no? the task will simply
schedule() in D state again.

Oleg.

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