If we get no user time allocated since the last account_system_vtime,
the system to user time ratio estimate can end up dividing by zero.
This was causing a problem noticed by Balbir Singh.
Signed-off-by: Michael Neuling <[EMAIL PROTECTED]>
---
Resent as the first version had whitespace corruption.
Paulus: can we send this up for 2.6.24?
arch/powerpc/kernel/time.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
Index: linux-2.6-ozlabs/arch/powerpc/kernel/time.c
===================================================================
--- linux-2.6-ozlabs.orig/arch/powerpc/kernel/time.c
+++ linux-2.6-ozlabs/arch/powerpc/kernel/time.c
@@ -241,8 +241,9 @@ void account_system_vtime(struct task_st
/* deltascaled includes both user and system time.
* Hence scale it based on the purr ratio to estimate
* the system time */
- deltascaled = deltascaled * get_paca()->system_time /
- (get_paca()->system_time + get_paca()->user_time);
+ if (get_paca()->user_time)
+ deltascaled = deltascaled * get_paca()->system_time /
+ (get_paca()->system_time + get_paca()->user_time);
delta += get_paca()->system_time;
get_paca()->system_time = 0;
}
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