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Date: Thu, 17 Nov 2011 02:59:13 +0100 From: Mike Galbraith <efault@....de> To: Suresh Siddha <suresh.b.siddha@...el.com> Cc: Peter Zijlstra <peterz@...radead.org>, linux-kernel <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com> Subject: Re: sched: Avoid SMT siblings in select_idle_sibling() if possible On Wed, 2011-11-16 at 10:37 -0800, Suresh Siddha wrote: > On Wed, 2011-11-16 at 01:24 -0800, Mike Galbraith wrote: > > At SIBLING, group = 0,4 = 0x5, 0x5 & 0xff = 1 = target. > > Mike, At the sibling level, domain span will be 0,4 which is 0x5. But > there are two individual groups. First group just contains cpu0 and the > second group contains cpu4. > > So if cpu0 is busy, we will check the next group to see if it is idle > (which is cpu4 in your example). So we will return cpu-4. Oh duh, right. > It should be ok. Isn't it? Nope, wasn't ok. I'll double check today though, and bend, spindle and/or mutilate as required. -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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