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[PATCH] fix scaled & unscaled cputime accounting

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The utimescaled / stimescaled fields in the task structure and the
global cpustat should be set on all architectures. On s390 the calls
to account_user_time_scaled and account_system_time_scaled never have
been added. In addition system time that is accounted as guest time
to the user time of a process is accounted to the scaled system time
instead of the scaled user time.
To fix the bugs and to prevent future forgetfulness this patch merges
account_system_time_scaled into account_system_time and
account_user_time_scaled into account_user_time.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: Michael Neuling <mikey@neuling.org>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2008-12-31 15:11:37 +01:00
parent 6a94cb7306
commit 457533a7d3
7 changed files with 37 additions and 56 deletions
Download patch file Download diff file Expand all files Collapse all files

12
kernel/timer.c
View file

@ -1023,13 +1023,11 @@ void account_process_tick(struct task_struct *p, int user_tick)
{
cputime_t one_jiffy = jiffies_to_cputime(1);
if (user_tick) {
account_user_time(p, one_jiffy);
account_user_time_scaled(p, cputime_to_scaled(one_jiffy));
} else {
account_system_time(p, HARDIRQ_OFFSET, one_jiffy);
account_system_time_scaled(p, cputime_to_scaled(one_jiffy));
}
if (user_tick)
account_user_time(p, one_jiffy, cputime_to_scaled(one_jiffy));
else
account_system_time(p, HARDIRQ_OFFSET, one_jiffy,
cputime_to_scaled(one_jiffy));
}
#endif