Commit 7b419f47 authored by Peter Zijlstra's avatar Peter Zijlstra
Browse files

sched: Add CONFIG_SCHED_CORE help text 



Hugh noted that the SCHED_CORE Kconfig option could do with a help
text.

Requested-by: default avatarHugh Dickins <hughd@google.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarRandy Dunlap <rdunlap@infradead.org>
Acked-by: default avatarHugh Dickins <hughd@google.com>
Link: https://lkml.kernel.org/r/YKyhtwhEgvtUDOyl@hirez.programming.kicks-ass.net
parent a8ea6fc9

kernel/Kconfig.preempt

+14 −0
Original line number Diff line number Diff line
@@ -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.