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Date: Mon, 17 Jun 2013 08:33:28 +0800 From: Alex Shi <alex.shi@...el.com> To: Lei Wen <adrian.wenl@...il.com> CC: mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de, akpm@...ux-foundation.org, bp@...en8.de, pjt@...gle.com, namhyung@...nel.org, efault@....de, morten.rasmussen@....com, vincent.guittot@...aro.org, preeti@...ux.vnet.ibm.com, viresh.kumar@...aro.org, linux-kernel@...r.kernel.org, mgorman@...e.de, riel@...hat.com, wangyun@...ux.vnet.ibm.com, Jason Low <jason.low2@...com>, Changlong Xie <changlongx.xie@...el.com>, sgruszka@...hat.com, fweisbec@...il.com Subject: Re: [patch v8 3/9] sched: set initial value of runnable avg for new forked task On 06/15/2013 08:09 PM, Lei Wen wrote: >>>>> >>> > and make forking balancing imbalance since incorrect load_avg_contrib. >>>>> >>> > >>>>> >>> > Further more, Morten Rasmussen notice some tasks were not launched at >>>>> >>> > once after created. So Paul and Peter suggest giving a start value for >>>>> >>> > new task runnable avg time same as sched_slice(). >>> >> I am confused at this comment, how set slice to runnable avg would change >>> >> the behavior of "some tasks were not launched at once after created"? >> > >> > I also don't know the details on Morten's machine. but just guess, there >> > are much tasks on in the run queue. the minimum load avg make the new >> > task wait its time... > Is there some possibility that since task structure is allocated without being > set to 0, and it cause the imbalance between runqueues. Then the new forked > is migrated to other cpus, so that it cause its execution being delayed? Is there sth weird happens? The task should be running a while before migration. and periodic load balance also need some time to happen. So generally, it has no such worries. -- Thanks Alex -- 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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