From 9301899be75b464ef097f0b5af7af6d9bd8f68a7 Mon Sep 17 00:00:00 2001
From: Balbir Singh <balbir@linux.vnet.ibm.com>
Date: Tue, 30 Oct 2007 00:26:32 +0100
Subject: [PATCH] sched: fix /proc/<PID>/stat stime/utime monotonicity, part 2
Extend Peter's patch to fix accounting issues, by keeping stime
monotonic too.
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Tested-by: Frans Pop <elendil@planet.nl>
---
fs/proc/array.c | 3 ++-
include/linux/sched.h | 2 +-
kernel/fork.c | 1 +
3 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/proc/array.c b/fs/proc/array.c
index d80baaabf835..eba339ecba27 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -374,7 +374,8 @@ static cputime_t task_stime(struct task_struct *p)
stime = nsec_to_clock_t(p->se.sum_exec_runtime) -
cputime_to_clock_t(task_utime(p));
- return clock_t_to_cputime(stime);
+ p->prev_stime = max(p->prev_stime, clock_t_to_cputime(stime));
+ return p->prev_stime;
}
#endif
diff --git a/include/linux/sched.h b/include/linux/sched.h
index b0b1fe6e0b17..155d7438f7ad 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1009,7 +1009,7 @@ struct task_struct {
unsigned int rt_priority;
cputime_t utime, stime, utimescaled, stimescaled;
cputime_t gtime;
- cputime_t prev_utime;
+ cputime_t prev_utime, prev_stime;
unsigned long nvcsw, nivcsw; /* context switch counts */
struct timespec start_time; /* monotonic time */
struct timespec real_start_time; /* boot based time */
diff --git a/kernel/fork.c b/kernel/fork.c
index a65bfc47177c..28a740151988 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1057,6 +1057,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->utimescaled = cputime_zero;
p->stimescaled = cputime_zero;
p->prev_utime = cputime_zero;
+ p->prev_stime = cputime_zero;
#ifdef CONFIG_TASK_XACCT
p->rchar = 0; /* I/O counter: bytes read */
--
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