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Date: Sun, 8 Mar 2015 23:37:54 -0400 From: Tejun Heo <tj@...nel.org> To: riel@...hat.com Cc: linux-kernel@...r.kernel.org Subject: Re: [PATCH v4 0/4] cpusets,isolcpus: exclude isolcpus from load balancing in cpusets On Tue, Mar 03, 2015 at 06:00:19PM -0500, riel@...hat.com wrote: > 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. > > This version fixes the UP compilation issue, in the same way done > for the other cpumasks. Can you please repost with Li Zefan <lizefan@...wei.com> and cgroups@...r.kernel.org cc'd? Thanks. -- tejun -- 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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