With a reliable steal time mechanism, we can tell if we're
out of the cpu for very long, differentiating from the case
that we simply got a real softlockup.
In the case we were out of cpu, the watchdog is fed, making
bogus softlockups disappear.
Signed-off-by: Glauber Costa <glom...@redhat.com>
---
arch/x86/kernel/kvmclock.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index a1f4852..1c496c8 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -104,6 +104,9 @@ cputime_t kvm_get_steal_time(void)
delta = this_steal_info - *last_steal_info;
+ if (delta > 1000UL)
+ touch_softlockup_watchdog();
+
*last_steal_info = this_steal_info;
put_cpu_var(steal_info);
--
1.6.2.2
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