From: Peter Zijlstra <peterz@infradead.org>
To: Hillf Danton <dhillf@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
Steven Rostedt <rostedt@goodmis.org>,
Mike Galbraith <efault@gmx.de>,
Yong Zhang <yong.zhang0@gmail.com>
Subject: Re: [PATCH] sched: remove starvation in check_preempt_equal_prio()
Date: Tue, 24 May 2011 15:47:16 +0200 [thread overview]
Message-ID: <1306244836.2497.60.camel@laptop> (raw)
In-Reply-To: <BANLkTinrHfVT43Evto3GqN8venDrLXoMbg@mail.gmail.com>
On Tue, 2011-05-24 at 21:34 +0800, Hillf Danton wrote:
> If there are pushable tasks and they are high enough in priority, in which
> case task p is covered, the current could keep holding its CPU.
-ENOPARSE..
> Even if current task has to release its CPU, requeuing task p could result in
> starvation of tasks that are of same priority and have been waiting on RQ for
> a couple of hours:/
Starvation of the same priority tasks is a perfectly valid situation for
SCHED_FIFO, also, your changelog fails to mention what you propose to do
about it.
next prev parent reply other threads:[~2011-05-24 13:44 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-24 13:34 [PATCH] sched: remove starvation in check_preempt_equal_prio() Hillf Danton
2011-05-24 13:45 ` Steven Rostedt
2011-05-24 14:11 ` Hillf Danton
2011-05-24 14:22 ` Steven Rostedt
2011-05-24 13:47 ` Peter Zijlstra [this message]
2011-05-24 14:01 ` Hillf Danton
2011-05-24 14:24 ` Steven Rostedt
2011-05-24 14:33 ` Hillf Danton
2011-05-24 14:46 ` Steven Rostedt
2011-05-24 15:04 ` Hillf Danton
2011-05-25 14:00 ` Hillf Danton
2011-05-25 14:13 ` Steven Rostedt
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