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Date: Thu, 28 Feb 2013 08:18:37 +0100 From: Mike Galbraith <efault@....de> To: Michael Wang <wangyun@...ux.vnet.ibm.com> Cc: LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Paul Turner <pjt@...gle.com>, Alex Shi <alex.shi@...el.com>, Andrew Morton <akpm@...ux-foundation.org>, Ram Pai <linuxram@...ibm.com>, "Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>, Namhyung Kim <namhyung@...nel.org> Subject: Re: [RFC PATCH] sched: wakeup buddy On Thu, 2013-02-28 at 14:38 +0800, Michael Wang wrote: > + /* > + * current is the only task on rq and it is > + * going to sleep, current cpu will be a nice > + * candidate for p to run on. > + */ The sync hint only means it might be going to sleep soon, and even then, there can still be enough execution overlap to be a win to schedule cross core. Sched pipe numbers will always be much prettier if you do wakeup cpu affine, as it's ~100% scheduler and ~100% sync. You may lose a lot on other stuff if you interpret the hint as gospel truth. IMHO, sched pipe is a "how fat have I become" benchmark, not "how well do I perform". The scheduler performs well when it makes more work happen. Playing ping-pong with yourself is _exercise_, not a job :) -Mike -- 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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