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Message-ID: <BANLkTin6RruD=M5=HVZ6UeqovUZwibS+pQ@mail.gmail.com> Date: Wed, 18 May 2011 10:07:21 +0800 From: Yong Zhang <yong.zhang0@...il.com> To: Hillf Danton <dhillf@...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 10:53 PM, Hillf Danton <dhillf@...il.com> wrote: > 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? Hmmm, I get your point. Reviewed-by: Yong Zhang <yong.zhang0@...il.com> Thanks, Yong -- Only stand for myself -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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