On Sun, 9 Dec 2007, Parag Warudkar wrote:
> On Dec 8, 2007 6:12 PM, Parag Warudkar <[email protected]> wrote:
> > No problems after disabling CONFIG_HIGHRES_TIMERS , CONFIG_CPU_IDLE
> > and CONFIG_NO_HZ.
> >
> > I will try enabling them one by one - HRT, NOHZ and CPU_IDLE last -
> > that way we can at least tell what is required to be hit with this
> > problem.
>
> Looks like CPU_IDLE=y is necessary for the problem to show up.
> With CPU_IDLE=n HRT+NO_HZ+TICK_ONESHOT does not give soft lockup problems.
> (Actually with HIGH_RES_TIMERS=NO_HZ=TICK_ONESHOT=y I do see short
> freezes on ssh - when I cannot type anything for may be a second even
> under 100% idle. But Soft Lock up doesnt show up in dmesg with this
> configuration.)
Can you please apply the patch below ? It prints out the internal
state of the clockevents/timer system when the softlockup is detected.
Thanks,
tglx
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 11df812..82f1a05 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -118,6 +118,7 @@ void softlockup_tick(void)
show_regs(regs);
else
dump_stack();
+ sysrq_timer_list_show();
spin_unlock(&print_lock);
}
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