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sched: Add CONFIG_SCHED_CORE help text
Hugh noted that the SCHED_CORE Kconfig option could do with a help text. Requested-by: Hugh Dickins <hughd@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Acked-by: Hugh Dickins <hughd@google.com> Link: https://lkml.kernel.org/r/YKyhtwhEgvtUDOyl@hirez.programming.kicks-ass.net
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@ -104,4 +104,18 @@ config SCHED_CORE
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bool "Core Scheduling for SMT"
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default y
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depends on SCHED_SMT
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help
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This option permits Core Scheduling, a means of coordinated task
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selection across SMT siblings. When enabled -- see
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prctl(PR_SCHED_CORE) -- task selection ensures that all SMT siblings
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will execute a task from the same 'core group', forcing idle when no
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matching task is found.
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Use of this feature includes:
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- mitigation of some (not all) SMT side channels;
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- limiting SMT interference to improve determinism and/or performance.
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SCHED_CORE is default enabled when SCHED_SMT is enabled -- when
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unused there should be no impact on performance.
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