From 73a2bcb0edb9ffb0b007b3546b430e2c6e415eee Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Mon, 29 Oct 2007 21:18:11 +0100 Subject: sched: keep utime/stime monotonic keep utime/stime monotonic. cpustats use utime/stime as a ratio against sum_exec_runtime, as a consequence it can happen - when the ratio changes faster than time accumulates - that either can be appear to go backwards. Signed-off-by: Peter Zijlstra Signed-off-by: Ingo Molnar --- fs/proc/array.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'fs/proc/array.c') diff --git a/fs/proc/array.c b/fs/proc/array.c index 63c95afb561f..d80baaabf835 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -358,7 +358,8 @@ static cputime_t task_utime(struct task_struct *p) } utime = (clock_t)temp; - return clock_t_to_cputime(utime); + p->prev_utime = max(p->prev_utime, clock_t_to_cputime(utime)); + return p->prev_utime; } static cputime_t task_stime(struct task_struct *p) -- cgit v1.2.3-59-g8ed1b