linux-kernel - Re: [PATCH] sched: fix priority leakage in pick_next_highest_task

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Message-ID: <BANLkTimgmam0_yg+5a58T3R_NYM6RQLakQ@mail.gmail.com>
Date:	Tue, 17 May 2011 22:53:22 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH] sched: fix priority leakage in pick_next_highest_task_rt()

On Tue, May 17, 2011 at 10:28 AM, Yong Zhang <yong.zhang0@...il.com> wrote:
> On Mon, May 16, 2011 at 8:55 PM, Hillf Danton <dhillf@...il.com> wrote:
>> When picking the second highest RT task for a given runqueue, if no
>> task found after scanning the queue of priority == idx, the next idx
>> should also be checked even in case that next is already existing, or
>> the window of priority leakage could be opened.
>
> I don't see what kind of problem you patch will fix.
> And mind explaining how priority leakage could happen?
>
Hi Yong

If no task is found after scanning the list at array->queue + idx,
what should we operate on next?
And why is the list scanned?

thanks
           Hillf
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