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sched_setaffinity.2: Mention the use of the 'isolcpus' kernel boot option 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2015-06-25 11:53:00 +02:00
parent b0ce4533dc
commit d726280aaf
1 changed files with 18 additions and 0 deletions
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18
man2/sched_setaffinity.2
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@ -204,6 +204,24 @@ will set the attribute for the main thread of the thread group.
instead of
.BR sched_setaffinity ().)
The
.I isolcpus
boot option can be used to isolate one or more CPUs at boot time,
so that no processes are scheduled onto those CPUs.
Following the use of this boot option,
the only way to schedule processes onto the isolated CPUs is via
.BR sched_setaffinity ()
or the
.BR cpuset (7)
mechanism.
For further information, see the kernel source file
.IR Documentation/kernel-parameters.txt .
As noted in that file,
.I isolcpus
is the preferred mechanism of isolating CPUs
(versus the alternative of manually setting the CPU affinity
of all processes on the system).
A child created via
.BR fork (2)
inherits its parent's CPU affinity mask.