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Commitb0d40d2

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Frederic WeisbeckerIngo Molnar
Frederic Weisbecker
authored and
Ingo Molnar
committed
sched/isolation: Document isolcpus= boot parameter flags, mark it deprecated
Document the latest updates on the isolcpus= boot option. While at it,let's also fix the details about the preferred way to isolate a set ofCPUs from the scheduler general domains. Cpusets offer a much betterinterface to achieve that.Signed-off-by: Frederic Weisbecker <frederic@kernel.org>Acked-by: Thomas Gleixner <tglx@linutronix.de>Acked-by: Peter Zijlstra <peterz@infradead.org>Cc: Chris Metcalf <cmetcalf@mellanox.com>Cc: Christoph Lameter <cl@linux.com>Cc: Linus Torvalds <torvalds@linux-foundation.org>Cc: Luiz Capitulino <lcapitulino@redhat.com>Cc: Mike Galbraith <efault@gmx.de>Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>Cc: Rik van Riel <riel@redhat.com>Cc: Wanpeng Li <kernellwp@gmail.com>Link:http://lkml.kernel.org/r/1509419914-16179-1-git-send-email-frederic@kernel.org[ Clarified the text some more, marked the boot option deprecated. ]Signed-off-by: Ingo Molnar <mingo@kernel.org>
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‎Documentation/admin-guide/kernel-parameters.txt‎

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isapnp=[ISAPNP]
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Format: <RDP>,<reset>,<pci_scan>,<verbosity>
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isolcpus=[KNL,SMP] Isolate CPUs from the general scheduler.
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The argument is a cpu list, as described above.
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isolcpus=[KNL,SMP] Isolate a given set of CPUs from disturbance.
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[Deprecated - use cpusets instead]
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Format: [flag-list,]<cpu-list>
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Specify one or more CPUs to isolate from disturbances
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specified in the flag list (default: domain):
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nohz
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Disable the tick when a single task runs.
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domain
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Isolate from the general SMP balancing and scheduling
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algorithms. Note that performing domain isolation this way
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is irreversible: it's not possible to bring back a CPU to
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the domains once isolated through isolcpus. It's strongly
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advised to use cpusets instead to disable scheduler load
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balancing through the "cpuset.sched_load_balance" file.
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It offers a much more flexible interface where CPUs can
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move in and out of an isolated set anytime.
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You can move a process onto or off an "isolated" CPU via
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the CPU affinity syscalls or cpuset.
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<cpu number> begins at 0 and the maximum value is
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"number of CPUs in system - 1".
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The format of <cpu-list> is described above.
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This option can be used to specify one or more CPUs
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to isolate from the general SMP balancing and scheduling
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algorithms. You can move a process onto or off an
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"isolated" CPU via the CPU affinity syscalls or cpuset.
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<cpu number> begins at 0 and the maximum value is
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"number of CPUs in system - 1".
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This option is the preferred way to isolate CPUs. The
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alternative -- manually setting the CPU mask of all
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tasks in the system -- can cause problems and
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suboptimal load balancer performance.
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iucv=[HW,NET]
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