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| author | Peter Zijlstra <peterz@infradead.org> | 2021-05-25 08:53:28 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-06-01 16:00:10 +0200 |
| commit | 7b419f47facd286c6723daca6ad69ec355473f78 (patch) | |
| tree | b179914710d03ba238938387c61cf756b175e2cb /kernel/Kconfig.preempt | |
| parent | a8ea6fc9b089156d9230bfeef964dd9be101a4a9 (diff) | |
| download | lwn-7b419f47facd286c6723daca6ad69ec355473f78.tar.gz lwn-7b419f47facd286c6723daca6ad69ec355473f78.zip | |
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
Diffstat (limited to 'kernel/Kconfig.preempt')
| -rw-r--r-- | kernel/Kconfig.preempt | 14 |
1 files changed, 14 insertions, 0 deletions
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. + |