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Wed, 11 Nov 2026 03:44:29 -0800 (PST) Received: from localhost.localdomain ([2a00:6d43:105:c401:e307:1a37:2e76:ce91]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4ba08e354b0sm43238545e9.1.2026.11.11.03.44.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Nov 2026 03:44:28 -0800 (PST) From: Marco Crivellari To: linux-kernel@vger.kernel.org Cc: Frederic Weisbecker , Ingo Molnar , Marco Crivellari , Michal Hocko , Aaron Tomlin , Marcelo Tosatti , Anna-Maria Behnsen , Thomas Gleixner , Jonathan Corbet , Shuah Khan , Randy Dunlap Subject: [PATCH v2 4/4] Documentation: no_hz: Add tick stop in polling idle Date: Wed, 11 Nov 2026 12:43:50 +0100 Message-ID: <20261111114406.346953-5-marco.crivellari@suse.com> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261111114406.346953-1-marco.crivellari@suse.com> References: <20261111114406.346953-1-marco.crivellari@suse.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On nohz_full CPUs the scheduling-clock tick is stopped while polling. Update the documentation accordingly. Cc: Anna-Maria Behnsen Cc: Thomas Gleixner Cc: Jonathan Corbet Cc: Shuah Khan Cc: Randy Dunlap Signed-off-by: Marco Crivellari --- Documentation/timers/no_hz.rst | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/timers/no_hz.rst b/Documentation/timers/no_hz.rst index 4006cab64079..86cea04d2a49 100644 --- a/Documentation/timers/no_hz.rst +++ b/Documentation/timers/no_hz.rst @@ -246,6 +246,8 @@ Known Issues be even worse than that of dyntick-idle. Furthermore, this parameter effectively disables Turbo Mode on Intel CPUs, which can significantly reduce maximum performance. + Note also that on nohz_full CPUs the scheduling-clock tick + is stopped while polling, as in the other idle states. * Adaptive-ticks slows user/kernel transitions slightly. This is not expected to be a problem for computationally intensive -- 2.56.0