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 <glommer@xxxxxxxxxx>
---
arch/x86/kernel/kvmclock.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index a1f4852..d217475 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -91,6 +91,7 @@ cputime_t kvm_get_steal_time(void)
{
u64 delta = 0;
u64 *last_steal_info, this_steal_info;
+ int touch_wd;
struct pvclock_vcpu_time_info *src;
src = &get_cpu_var(hv_clock);
@@ -104,6 +105,10 @@ cputime_t kvm_get_steal_time(void)
delta = this_steal_info - *last_steal_info;
+ touch_wd = softlockup_thresh * 1000UL;
+ if ((touch_wd > 0) && (delta > touch_wd))
+ touch_softlockup_watchdog();
+
*last_steal_info = this_steal_info;
put_cpu_var(steal_info);
--
1.6.2.2
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