On Wed, May 14, 2008 at 11:41:18AM +0300, Sakari Ailus wrote:
> I have three UML instances running on a host. First, they all were
> unresponsive simultaneously using all CPU time they could get. After a
> while they became responsive again. I could log in through SSH. The
> funny thing is that the date command showed correct date and time (as
> far as I remember, can't test it now as they are hung again) while the
> time in bash prompt was constant showing the time around the initial
> hang, which is the same on all three instances.
I reproduced and debugged a similar problem, resulting in the patch
below. See if it makes any difference for you...
Jeff
--
Work email - jdike at linux dot intel dot com
Index: 2.6/stable/arch/um/os-Linux/time.c
===================================================================
--- 2.6.orig/stable/arch/um/os-Linux/time.c 2008-05-14 14:55:56.000000000
-0400
+++ 2.6/stable/arch/um/os-Linux/time.c 2008-05-14 15:30:48.000000000 -0400
@@ -66,12 +66,21 @@ long long disable_timer(void)
return timeval_to_ns(&time.it_value);
}
+static long long last_time;
+
long long os_nsecs(void)
{
struct timeval tv;
+ long long ret;
gettimeofday(&tv, NULL);
- return timeval_to_ns(&tv);
+ ret = timeval_to_ns(&tv);
+
+ if((last_time != 0) && (last_time > ret))
+ ret = last_time;
+
+ last_time = ret;
+ return ret;
}
#ifdef UML_CONFIG_NO_HZ
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