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Date: Sat, 28 Feb 2015 11:21:42 +0800 From: Zefan Li <lizefan@...wei.com> To: <riel@...hat.com> CC: <linux-kernel@...r.kernel.org>, Peter Zijlstra <peterz@...radead.org>, Clark Williams <williams@...hat.com>, Ingo Molnar <mingo@...hat.com>, "Luiz Capitulino" <lcapitulino@...hat.com>, Mike Galbraith <umgwanakikbuti@...il.com>, <cgroups@...r.kernel.org> Subject: Re: [PATCH 1/2] cpusets,isolcpus: exclude isolcpus from load balancing in cpusets On 2015/2/26 0:38, riel@...hat.com wrote: > From: Rik van Riel <riel@...hat.com> > > Ensure that cpus specified with the isolcpus= boot commandline > option stay outside of the load balancing in the kernel scheduler. > > Operations like load balancing can introduce unwanted latencies, > which is exactly what the isolcpus= commandline is there to prevent. > > Previously, simply creating a new cpuset, without even touching the > cpuset.cpus field inside the new cpuset, would undo the effects of > isolcpus=, by creating a scheduler domain spanning the whole system, > and setting up load balancing inside that domain. The cpuset root > cpuset.cpus file is read-only, so there was not even a way to undo > that effect. > > This does not impact the majority of cpusets users, since isolcpus= > is a fairly specialized feature used for realtime purposes. > > Cc: Peter Zijlstra <peterz@...radead.org> > Cc: Clark Williams <williams@...hat.com> > Cc: Li Zefan <lizefan@...wei.com> > Cc: Ingo Molnar <mingo@...hat.com> > Cc: Luiz Capitulino <lcapitulino@...hat.com> > Cc: Mike Galbraith <umgwanakikbuti@...il.com> > Cc: cgroups@...r.kernel.org > Signed-off-by: Rik van Riel <riel@...hat.com> > Tested-by: David Rientjes <rientjes@...gle.com> Acked-by: Zefan Li <lizefan@...wei.com> -- 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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