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authorRavikiran G Thirumalai <kiran@scalex86.org>2007-10-16 23:26:09 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 08:42:47 -0700
commitc4f3b63fe15b4629aa1ec163c95ab30423d0f76a (patch)
tree432723f1c7ac2fcff0aa57377c31187140d69145 /Documentation/sysctl
parenta5f2ce3c6024a5bb895647b6bd88ecae5001020a (diff)
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softlockup: add a /proc tuning parameter
Control the trigger limit for softlockup warnings. This is useful for debugging softlockups, by lowering the softlockup_thresh to identify possible softlockups earlier. This patch: 1. Adds a sysctl softlockup_thresh with valid values of 1-60s (Higher value to disable false positives) 2. Changes the softlockup printk to print the cpu softlockup time [akpm@linux-foundation.org: Fix various warnings and add definition of "two"] Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org> Signed-off-by: Shai Fultheim <shai@scalex86.org> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/sysctl')
-rw-r--r--Documentation/sysctl/kernel.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 111fd28..8984a53 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -320,6 +320,14 @@ kernel. This value defaults to SHMMAX.
==============================================================
+softlockup_thresh:
+
+This value can be used to lower the softlockup tolerance
+threshold. The default threshold is 10s. If a cpu is locked up
+for 10s, the kernel complains. Valid values are 1-60s.
+
+==============================================================
+
tainted:
Non-zero if the kernel has been tainted. Numeric values, which