Patch "sched: Do not account bogus utime" has been added to the 3.9-stable tree

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This is a note to let you know that I've just added the patch titled

    sched: Do not account bogus utime

to the 3.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     sched-do-not-account-bogus-utime.patch
and it can be found in the queue-3.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 772c808a252594692972773f6ee41c289b8e0b2a Mon Sep 17 00:00:00 2001
From: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Date: Tue, 30 Apr 2013 11:35:05 +0200
Subject: sched: Do not account bogus utime

From: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>

commit 772c808a252594692972773f6ee41c289b8e0b2a upstream.

Due to rounding in scale_stime(), for big numbers, scaled stime
values will grow in chunks. Since rtime grow in jiffies and we
calculate utime like below:

	prev->stime = max(prev->stime, stime);
	prev->utime = max(prev->utime, rtime - prev->stime);

we could erroneously account stime values as utime. To prevent
that only update prev->{u,s}time values when they are smaller
than current rtime.

Signed-off-by: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: rostedt@xxxxxxxxxxx
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave@xxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1367314507-9728-2-git-send-email-sgruszka@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 kernel/sched/cputime.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -591,6 +591,14 @@ static void cputime_adjust(struct task_c
 	 */
 	rtime = nsecs_to_cputime(curr->sum_exec_runtime);
 
+	/*
+	 * Update userspace visible utime/stime values only if actual execution
+	 * time is bigger than already exported. Note that can happen, that we
+	 * provided bigger values due to scaling inaccuracy on big numbers.
+	 */
+	if (prev->stime + prev->utime >= rtime)
+		goto out;
+
 	if (!rtime) {
 		stime = 0;
 	} else if (!total) {
@@ -608,6 +616,7 @@ static void cputime_adjust(struct task_c
 	prev->stime = max(prev->stime, stime);
 	prev->utime = max(prev->utime, rtime - prev->stime);
 
+out:
 	*ut = prev->utime;
 	*st = prev->stime;
 }


Patches currently in stable-queue which might be from sgruszka@xxxxxxxxxx are

queue-3.9/sched-do-not-account-bogus-utime.patch
queue-3.9/revert-math64-new-div64_u64_rem-helper.patch
queue-3.9/sched-lower-chances-of-cputime-scaling-overflow.patch
queue-3.9/sched-avoid-prev-stime-underflow.patch
queue-3.9/sched-avoid-cputime-scaling-overflow.patch
queue-3.9/math64-new-div64_u64_rem-helper.patch
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