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Thu, 05 Mar 2026 04:33:52 -0800 (PST) Date: Thu, 5 Mar 2026 13:33:50 +0100 From: Petr Mladek To: mrungta@google.com Cc: Jonathan Corbet , Jinchao Wang , Yunhui Cui , Stephane Eranian , Ian Rogers , Li Huafei , Feng Tang , Max Kellermann , Douglas Anderson , Andrew Morton , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Subject: Re: [PATCH 2/4] doc: watchdog: Clarify hardlockup detection timing Message-ID: References: <20260212-hardlockup-watchdog-fixes-v1-0-745f1dce04c3@google.com> <20260212-hardlockup-watchdog-fixes-v1-2-745f1dce04c3@google.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260212-hardlockup-watchdog-fixes-v1-2-745f1dce04c3@google.com> On Thu 2026-02-12 14:12:11, Mayank Rungta via B4 Relay wrote: > From: Mayank Rungta > > The current documentation implies that a hardlockup is strictly defined > as looping for "more than 10 seconds." However, the detection mechanism > is periodic (based on `watchdog_thresh`), meaning detection time varies > significantly depending on when the lockup occurs relative to the NMI > perf event. > > Update the definition to remove the strict "more than 10 seconds" > constraint in the introduction and defer details to the Implementation > section. > > Additionally, add a "Detection Overhead" section illustrating the > Best Case (~6s) and Worst Case (~20s) detection scenarios to provide > administrators with a clearer understanding of the watchdog's > latency. > > Signed-off-by: Mayank Rungta Great addition: Reviewed-by: Petr Mladek Best Regards, Petr