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SubjectRe: [PATCH] sched: Add CONFIG_SCHED_CORE help text
On Tue, 25 May 2021, Peter Zijlstra wrote:

> Subject: sched: Add CONFIG_SCHED_CORE help text
> From: Peter Zijlstra <peterz@infradead.org>
> Date: Tue May 25 08:53:28 CEST 2021
>
> 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>

Thanks,
Acked-by: Hugh Dickins <hughd@google.com>
if necessary (but there's more than enough of me there already).

> ---
> kernel/Kconfig.preempt | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> --- 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.
> +

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