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authorMichael Neuling <mikey@neuling.org>2008-02-06 01:36:12 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-06 10:41:00 -0800
commit06b8e878a9bc9301201cffe186eba99c4185f20a (patch)
tree857434ed559cdb001177e81283be6f0b5693a781 /kernel/timer.c
parentd9afa43532adf8a31b93c4c7601fda3f423d8972 (diff)
downloadop-kernel-dev-06b8e878a9bc9301201cffe186eba99c4185f20a.zip
op-kernel-dev-06b8e878a9bc9301201cffe186eba99c4185f20a.tar.gz
taskstats scaled time cleanup
This moves the ability to scale cputime into generic code. This allows us to fix the issue in kernel/timer.c (noticed by Balbir) where we could only add an unscaled value to the scaled utime/stime. This adds a cputime_to_scaled function. As before, the POWERPC version does the scaling based on the last SPURR/PURR ratio calculated. The generic and s390 (only other arch to implement asm/cputime.h) versions are both NOPs. Also moves the SPURR and PURR snapshots closer. Signed-off-by: Michael Neuling <mikey@neuling.org> Cc: Jay Lan <jlan@engr.sgi.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/timer.c')
-rw-r--r--kernel/timer.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/kernel/timer.c b/kernel/timer.c
index 9fbb472..70b29b5 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -818,12 +818,14 @@ unsigned long next_timer_interrupt(void)
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
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, jiffies_to_cputime(1));
- account_user_time_scaled(p, jiffies_to_cputime(1));
+ account_user_time(p, one_jiffy);
+ account_user_time_scaled(p, cputime_to_scaled(one_jiffy));
} else {
- account_system_time(p, HARDIRQ_OFFSET, jiffies_to_cputime(1));
- account_system_time_scaled(p, jiffies_to_cputime(1));
+ account_system_time(p, HARDIRQ_OFFSET, one_jiffy);
+ account_system_time_scaled(p, cputime_to_scaled(one_jiffy));
}
}
#endif
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