The conversion of a cputime to micro seconds can be done without the detour via jiffies. This avoids unnecessary and costly calculations, e.g. on s390 a 64-bit division and a multiplication can be replaced with a simple shift.
Signed-off-by: Martin Schwidefsky <[email protected]> --- kernel/tsacct.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/kernel/tsacct.c b/kernel/tsacct.c index a1dd9a1..bf09be1 100644 --- a/kernel/tsacct.c +++ b/kernel/tsacct.c @@ -126,16 +126,13 @@ static void __acct_update_integrals(struct task_struct *tsk, { if (likely(tsk->mm)) { cputime_t time, dtime; - struct timeval value; unsigned long flags; u64 delta; local_irq_save(flags); time = stime + utime; dtime = time - tsk->acct_timexpd; - jiffies_to_timeval(cputime_to_jiffies(dtime), &value); - delta = value.tv_sec; - delta = delta * USEC_PER_SEC + value.tv_usec; + delta = cputime_to_usecs(dtime); if (delta == 0) goto out; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
