Attachment 149961 Details for Bug 206366 – RHEL5 fix for this issue

[patch] RHEL5 fix for this issue

softlockup.patch (text/plain), 2.28 KB, created by Prarit Bhargava on 2007-03-13 17:54:28 UTC

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Creator: Prarit Bhargava

Created: 2007-03-13 17:54:28 UTC

Size: 2.28 KB

patch

obsolete

>There are some debug situations when soft lockup warnings are expected in the
>kernel.  For example when doing an alt-sysrq-t on a large number of processes
>the dump to console can take a long time and spinlocks may be held over that
>period.
>
>This patch introduces touch_all_softlockup_watchdogs in order to touch all
>cpu's touch_timestamp so that the soft lockup warning message is avoided.
>
>diff -urNp -X linux-2.6.18.ia64/Documentation/dontdiff linux-2.6.18.ia64.orig/include/linux/sched.h linux-2.6.18.ia64/include/linux/sched.h
>--- linux-2.6.18.ia64.orig/include/linux/sched.h	2007-03-12 05:47:49.000000000 -0400
>+++ linux-2.6.18.ia64/include/linux/sched.h	2007-03-12 14:35:11.000000000 -0400
>@@ -216,6 +216,7 @@ extern void scheduler_tick(void);
> extern void softlockup_tick(void);
> extern void spawn_softlockup_task(void);
> extern void touch_softlockup_watchdog(void);
>+extern void touch_all_softlockup_watchdogs(void);
> #else
> static inline void softlockup_tick(void)
> {
>diff -urNp -X linux-2.6.18.ia64/Documentation/dontdiff linux-2.6.18.ia64.orig/kernel/sched.c linux-2.6.18.ia64/kernel/sched.c
>--- linux-2.6.18.ia64.orig/kernel/sched.c	2007-03-12 05:47:49.000000000 -0400
>+++ linux-2.6.18.ia64/kernel/sched.c	2007-03-13 11:20:32.000000000 -0400
>@@ -4802,6 +4802,9 @@ void show_state(void)
> 		touch_nmi_watchdog();
> 		show_task(p);
> 	} while_each_thread(g, p);
>+#if defined(CONFIG_DETECT_SOFTLOCKUP)
>+	touch_all_softlockup_watchdogs();
>+#endif
> 
> 	read_unlock(&tasklist_lock);
> 	debug_show_all_locks();
>diff -urNp -X linux-2.6.18.ia64/Documentation/dontdiff linux-2.6.18.ia64.orig/kernel/softlockup.c linux-2.6.18.ia64/kernel/softlockup.c
>--- linux-2.6.18.ia64.orig/kernel/softlockup.c	2007-03-12 05:47:49.000000000 -0400
>+++ linux-2.6.18.ia64/kernel/softlockup.c	2007-03-13 13:51:26.000000000 -0400
>@@ -8,6 +8,7 @@
>  */
> #include <linux/mm.h>
> #include <linux/cpu.h>
>+#include <linux/cpumask.h>
> #include <linux/init.h>
> #include <linux/delay.h>
> #include <linux/kthread.h>
>@@ -40,6 +41,14 @@ void touch_softlockup_watchdog(void)
> }
> EXPORT_SYMBOL(touch_softlockup_watchdog);
> 
>+void touch_all_softlockup_watchdogs(void)
>+{
>+	int cpu;
>+
>+	for_each_possible_cpu(cpu)
>+		per_cpu(touch_timestamp, cpu) = jiffies;
>+}
>+
> /*
>  * This callback runs from the timer interrupt, and checks
>  * whether the watchdog thread has hung or not:

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