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Message-ID: <tip-08825c90af6e4bb902b3a51abb0ae6530199f682@git.kernel.org> Date: Tue, 28 May 2013 06:32:13 -0700 From: tip-bot for Li Zefan <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org, tglx@...utronix.de, dzickus@...hat.com, lizefan@...wei.com Subject: [tip:perf/core] watchdog: Document watchdog_thresh sysctl Commit-ID: 08825c90af6e4bb902b3a51abb0ae6530199f682 Gitweb: http://git.kernel.org/tip/08825c90af6e4bb902b3a51abb0ae6530199f682 Author: Li Zefan <lizefan@...wei.com> AuthorDate: Fri, 17 May 2013 10:31:20 +0800 Committer: Ingo Molnar <mingo@...nel.org> CommitDate: Tue, 28 May 2013 11:28:19 +0200 watchdog: Document watchdog_thresh sysctl Signed-off-by: Li Zefan <lizefan@...wei.com> Acked-by: Don Zickus <dzickus@...hat.com> Link: http://lkml.kernel.org/r/51959678.6000802@huawei.com Signed-off-by: Ingo Molnar <mingo@...nel.org> --- Documentation/sysctl/kernel.txt | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index ccd4258..e8fabd6 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -76,6 +76,7 @@ show up in /proc/sys/kernel: - tainted - threads-max - unknown_nmi_panic +- watchdog_thresh - version ============================================================== @@ -648,3 +649,16 @@ that time, kernel debugging information is displayed on console. NMI switch that most IA32 servers have fires unknown NMI up, for example. If a system hangs up, try pressing the NMI switch. + +============================================================== + +watchdog_thresh: + +This value can be used to control the frequency of hrtimer and NMI +events and the soft and hard lockup thresholds. The default threshold +is 10 seconds. + +The softlockup threshold is (2 * watchdog_thresh). Setting this +tunable to zero will disable lockup detection altogether. + +============================================================== -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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