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    Subject[tip: sched/core] sched: Add CONFIG_SCHED_CORE help text
    The following commit has been merged into the sched/core branch of tip:

    Commit-ID: 7b419f47facd286c6723daca6ad69ec355473f78
    Gitweb: https://git.kernel.org/tip/7b419f47facd286c6723daca6ad69ec355473f78
    Author: Peter Zijlstra <peterz@infradead.org>
    AuthorDate: Tue, 25 May 2021 08:53:28 +02:00
    Committer: Peter Zijlstra <peterz@infradead.org>
    CommitterDate: Tue, 01 Jun 2021 16:00:10 +02:00

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

    diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
    index ea1e333..bd7c414 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.
    +

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