linux-kernel - [PATCH v4 RESEND 0/4] cpusets,isolcpus: exclude isolcpus from load balancing in cpusets

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Message-Id: <1425917530-1771-1-git-send-email-riel@redhat.com>
Date:	Mon,  9 Mar 2015 12:12:06 -0400
From:	riel@...hat.com
To:	tj@...nel.org
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	lizefan@...wei.com
Subject: [PATCH v4 RESEND 0/4] cpusets,isolcpus: exclude isolcpus from load balancing in cpusets

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.

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