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softlockup: add a /proc tuning parameter

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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>
This commit is contained in:
Ravikiran G Thirumalai
2007-10-16 23:26:09 -07:00
committed by Linus Torvalds
parent a5f2ce3c60
commit c4f3b63fe1
4 changed files with 40 additions and 9 deletions
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33
kernel/sysctl.c
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@@ -80,6 +80,19 @@ extern int maps_protect;
extern int sysctl_stat_interval;
extern int audit_argv_kb;
/* Constants used for minimum and maximum */
#ifdef CONFIG_DETECT_SOFTLOCKUP
static int one = 1;
static int sixty = 60;
#endif
#ifdef CONFIG_MMU
static int two = 2;
#endif
static int zero;
static int one_hundred = 100;
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static int maxolduid = 65535;
static int minolduid;
@@ -711,6 +724,19 @@ static ctl_table kern_table[] = {
.proc_handler = &proc_dointvec,
},
#endif
#ifdef CONFIG_DETECT_SOFTLOCKUP
{
.ctl_name = CTL_UNNUMBERED,
.procname = "softlockup_thresh",
.data = &softlockup_thresh,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &one,
.extra2 = &sixty,
},
#endif
#ifdef CONFIG_COMPAT
{
.ctl_name = KERN_COMPAT_LOG,
@@ -757,13 +783,6 @@ static ctl_table kern_table[] = {
{ .ctl_name = 0 }
};
/* Constants for minimum and maximum testing in vm_table.
We use these as one-element integer vectors. */
static int zero;
static int two = 2;
static int one_hundred = 100;
static ctl_table vm_table[] = {
{
.ctl_name = VM_OVERCOMMIT_MEMORY,