From 7b419f47facd286c6723daca6ad69ec355473f78 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Tue, 25 May 2021 08:53:28 +0200 Subject: 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 Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Randy Dunlap Acked-by: Hugh Dickins Link: https://lkml.kernel.org/r/YKyhtwhEgvtUDOyl@hirez.programming.kicks-ass.net --- kernel/Kconfig.preempt | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'kernel/Kconfig.preempt') diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt index ea1e3331c0ba..bd7c4147b9a8 100644 --- a/kernel/Kconfig.preempt +++ b/kernel/Kconfig.preempt @@ -104,4 +104,18 @@ config SCHED_CORE bool "Core Scheduling for SMT" default y depends on SCHED_SMT + help + This option permits Core Scheduling, a means of coordinated task + selection across SMT siblings. When enabled -- see + prctl(PR_SCHED_CORE) -- task selection ensures that all SMT siblings + will execute a task from the same 'core group', forcing idle when no + matching task is found. + + Use of this feature includes: + - mitigation of some (not all) SMT side channels; + - limiting SMT interference to improve determinism and/or performance. + + SCHED_CORE is default enabled when SCHED_SMT is enabled -- when + unused there should be no impact on performance. + -- cgit v1.2.3