Commit-ID: d99ca3b977fc5a93141304f571475c2af9e6c1c5
Gitweb: http://git.kernel.org/tip/d99ca3b977fc5a93141304f571475c2af9e6c1c5
Author: Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx>
AuthorDate: Wed, 2 Dec 2009 17:26:47 +0900
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Wed, 2 Dec 2009 17:32:39 +0100
sched, cputime: Cleanups related to task_times()
- Remove if({u,s}t)s because no one call it with NULL now.
- Use cputime_{add,sub}().
- Add ifndef-endif for prev_{u,s}time since they are used
only when !VIRT_CPU_ACCOUNTING.
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Spencer Candland <spencer@xxxxxxxxxxxx>
Cc: Americo Wang <xiyou.wangcong@xxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxx>
Cc: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
LKML-Reference: <4B1624C7.7040302@xxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
include/linux/sched.h | 2 ++
kernel/fork.c | 2 ++
kernel/sched.c | 16 ++++++----------
3 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 0395b0f..dff85e5 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1331,7 +1331,9 @@ struct task_struct {
cputime_t utime, stime, utimescaled, stimescaled;
cputime_t gtime;
+#ifndef CONFIG_VIRT_CPU_ACCOUNTING
cputime_t prev_utime, prev_stime;
+#endif
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 166b8c4..ad7cb6d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1066,8 +1066,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->gtime = cputime_zero;
p->utimescaled = cputime_zero;
p->stimescaled = cputime_zero;
+#ifndef CONFIG_VIRT_CPU_ACCOUNTING
p->prev_utime = cputime_zero;
p->prev_stime = cputime_zero;
+#endif
p->default_timer_slack_ns = current->timer_slack_ns;
diff --git a/kernel/sched.c b/kernel/sched.c
index 4883fee..17e2c1d 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5184,10 +5184,8 @@ void account_idle_ticks(unsigned long ticks)
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
{
- if (ut)
- *ut = p->utime;
- if (st)
- *st = p->stime;
+ *ut = p->utime;
+ *st = p->stime;
}
#else
@@ -5197,7 +5195,7 @@ void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
{
- cputime_t rtime, utime = p->utime, total = utime + p->stime;
+ cputime_t rtime, utime = p->utime, total = cputime_add(utime, p->stime);
/*
* Use CFS's precise accounting:
@@ -5217,12 +5215,10 @@ void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
* Compare with previous values, to keep monotonicity:
*/
p->prev_utime = max(p->prev_utime, utime);
- p->prev_stime = max(p->prev_stime, rtime - p->prev_utime);
+ p->prev_stime = max(p->prev_stime, cputime_sub(rtime, p->prev_utime));
- if (ut)
- *ut = p->prev_utime;
- if (st)
- *st = p->prev_stime;
+ *ut = p->prev_utime;
+ *st = p->prev_stime;
}
#endif
--
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