From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Sat, 13 Jul 2013 15:24:20 +0000 (+0200)
Subject: vtime: Always scale generic vtime accounting results
X-Git-Tag: firefly_0821_release~176^2~5281^2~3^2~4
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b854fafa4e06c50a92e00b39d75ee62083d986d6;p=firefly-linux-kernel-4.4.55.git

vtime: Always scale generic vtime accounting results

The cputime accounting in full dynticks can be a subtle
mixup of CPUs using tick based accounting and others using
generic vtime.

As long as the tick can have a share on producing these stats, we
want to scale the result against CFS precise accounting as the tick
can miss some task hiding between the periodic interrupt.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Kevin Hilman <khilman@linaro.org>
---

diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 0831b06aab97..e9e742ed7280 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -553,12 +553,6 @@ static void cputime_adjust(struct task_cputime *curr,
 {
 	cputime_t rtime, stime, utime, total;
 
-	if (vtime_accounting_enabled()) {
-		*ut = curr->utime;
-		*st = curr->stime;
-		return;
-	}
-
 	stime = curr->stime;
 	total = stime + curr->utime;