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Wed, 26 Aug 2026 06:29:26 -0700 (PDT) From: Costa Shulyupin To: Jonathan Corbet , Shuah Khan , Randy Dunlap , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v1] docs: sysctl: timer_migration is for hrtimer only Date: Wed, 26 Aug 2026 16:29:19 +0300 Message-ID: <20260826132921.294142-1-costa.shul@redhat.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Since commit b2cf7507e1864 ("timers: Always queue timers on the local CPU") __mod_timer() no longer depends on timers_migration_enabled. Only high-resolution timer migration from isolated to housekeeping CPUs depends on it. Update and clarify the documentation accordingly. Signed-off-by: Costa Shulyupin --- Documentation/admin-guide/sysctl/kernel.rst | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index b6328cd0f43e..fb38d654846d 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -1609,8 +1609,10 @@ If a value outside of this range is written to ``threads-max`` an timer_migration =============== -When set to a non-zero value, attempt to migrate timers away from idle cpus to -allow them to remain in low power states longer. +When set to a non-zero value, attempt to migrate high-resolution timers from +nohz isolated (nohz_full) to housekeeping CPUs. +See Documentation/admin-guide/cpu-isolation.rst +and Documentation/admin-guide/kernel-parameters.rst. Default is set (1). -- 2.55.0