From: Oleg Nesterov <oleg@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>
Cc: Kautuk Consul <consul.kautuk@gmail.com>,
Ingo Molnar <mingo@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.cz>,
David Rientjes <rientjes@google.com>,
Ionut Alexa <ionut.m.alexa@gmail.com>,
Guillaume Morin <guillaume@morinfr.org>,
linux-kernel@vger.kernel.org, Kirill Tkhai <tkhai@yandex.ru>
Subject: task_numa_fault() && TASK_DEAD
Date: Wed, 3 Sep 2014 18:08:19 +0200 [thread overview]
Message-ID: <20140903160819.GA7682@redhat.com> (raw)
In-Reply-To: <20140902164714.GA17033@redhat.com>
On 09/02, Oleg Nesterov wrote:
>
> The usage of TASK_DEAD in task_numa_fault() is wrong in any case.
Rik, I can't understand why task_numa_fault() needs this check at all,
but "if (p->state == TASK_DEAD)" looks certainly wrong. You could replace
this check with BUG_ON(p->state == TASK_DEAD). Perhaps you meant PF_EXITING?
And a stupid (really, I don't understand this code) question:
/* for example, ksmd faulting in a user's mm */
if (!p->mm)
return;
OK, but perhaps it make sense to pass "mm" as another argument and do
/* ksmd faulting in a user's mm, or debugger, or kthread use_mm() caller */
if (p->mm != mm)
return;
?
Oleg.
next prev parent reply other threads:[~2014-09-03 16:11 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-25 10:54 [PATCH 1/1] do_exit(): Solve possibility of BUG() due to race with try_to_wake_up() Kautuk Consul
2014-08-25 15:57 ` Oleg Nesterov
2014-08-26 4:45 ` Kautuk Consul
2014-08-26 15:03 ` Oleg Nesterov
2014-09-01 15:39 ` Peter Zijlstra
2014-09-01 17:58 ` Oleg Nesterov
2014-09-01 19:09 ` Peter Zijlstra
2014-09-02 15:52 ` Oleg Nesterov
2014-09-02 16:47 ` Oleg Nesterov
2014-09-02 17:39 ` Peter Zijlstra
2014-09-03 13:36 ` Oleg Nesterov
2014-09-03 14:44 ` Peter Zijlstra
2014-09-03 15:18 ` Oleg Nesterov
2014-09-04 7:15 ` Peter Zijlstra
2014-09-04 17:03 ` Paul E. McKenney
2014-09-04 5:04 ` Ingo Molnar
2014-09-04 6:32 ` Peter Zijlstra
2014-09-03 16:08 ` Oleg Nesterov [this message]
2014-09-03 16:33 ` task_numa_fault() && TASK_DEAD Rik van Riel
2014-09-04 7:11 ` Peter Zijlstra
2014-09-04 10:39 ` Oleg Nesterov
2014-09-04 19:14 ` Hugh Dickins
2014-09-05 11:35 ` Oleg Nesterov
2014-09-03 9:04 ` [PATCH 1/1] do_exit(): Solve possibility of BUG() due to race with try_to_wake_up() Kirill Tkhai
2014-09-03 9:45 ` Peter Zijlstra
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