From: Li Zefan <lizefan@huawei.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Don Zickus <dzickus@redhat.com>, LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH 2/3] watchdog: Document watchdog_thresh sysctl
Date: Fri, 17 May 2013 10:31:20 +0800 [thread overview]
Message-ID: <51959678.6000802@huawei.com> (raw)
In-Reply-To: <51959668.9040106@huawei.com>
Signed-off-by: Li Zefan <lizefan@huawei.com>
---
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.
+
+==============================================================
--
1.8.0.2
next prev parent reply other threads:[~2013-05-17 2:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-17 2:31 [PATCH 1/3] watchdog: Disallow setting watchdog_thresh to -1 Li Zefan
2013-05-17 2:31 ` Li Zefan [this message]
2013-05-17 13:07 ` [PATCH 2/3] watchdog: Document watchdog_thresh sysctl Don Zickus
2013-05-28 13:32 ` [tip:perf/core] " tip-bot for Li Zefan
2013-05-17 2:31 ` [PATCH 3/3] watchdog: Remove softlockup_thresh from Documentation Li Zefan
2013-05-17 13:07 ` Don Zickus
2013-05-28 13:33 ` [tip:perf/core] " tip-bot for Li Zefan
2013-05-17 13:06 ` [PATCH 1/3] watchdog: Disallow setting watchdog_thresh to -1 Don Zickus
2013-05-28 13:30 ` [tip:perf/core] " tip-bot for Li Zefan
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