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taskstats scaled time cleanup

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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>
This commit is contained in:
Michael Neuling 2008-02-06 01:36:12 -08:00 • committed by Linus Torvalds
parent d9afa43532
commit 06b8e878a9
6 changed files with 28 additions and 12 deletions
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10
kernel/timer.c
View file

@ -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