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authorIngo Molnar <mingo@elte.hu>2008-09-06 16:51:57 +0200
committerIngo Molnar <mingo@elte.hu>2008-09-06 16:51:57 +0200
commit7f79d852ed30a06eebf7497afe9334a726db3d40 (patch)
tree0057281f17501b635d3d88cda9a14203706f5dcc /kernel/sched.c
parentaef745fca016aea45adae5c98e8698904dd8ad51 (diff)
parent70bb08962ea9bd50797ae9f16b2493f5f7c65053 (diff)
Merge branch 'linus' into sched/devel
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index b112caaa400..8626ae50ce0 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4176,6 +4176,65 @@ void account_steal_time(struct task_struct *p, cputime_t steal)
}
/*
+ * Use precise platform statistics if available:
+ */
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+cputime_t task_utime(struct task_struct *p)
+{
+ return p->utime;
+}
+
+cputime_t task_stime(struct task_struct *p)
+{
+ return p->stime;
+}
+#else
+cputime_t task_utime(struct task_struct *p)
+{
+ clock_t utime = cputime_to_clock_t(p->utime),
+ total = utime + cputime_to_clock_t(p->stime);
+ u64 temp;
+
+ /*
+ * Use CFS's precise accounting:
+ */
+ temp = (u64)nsec_to_clock_t(p->se.sum_exec_runtime);
+
+ if (total) {
+ temp *= utime;
+ do_div(temp, total);
+ }
+ utime = (clock_t)temp;
+
+ p->prev_utime = max(p->prev_utime, clock_t_to_cputime(utime));
+ return p->prev_utime;
+}
+
+cputime_t task_stime(struct task_struct *p)
+{
+ clock_t stime;
+
+ /*
+ * Use CFS's precise accounting. (we subtract utime from
+ * the total, to make sure the total observed by userspace
+ * grows monotonically - apps rely on that):
+ */
+ stime = nsec_to_clock_t(p->se.sum_exec_runtime) -
+ cputime_to_clock_t(task_utime(p));
+
+ if (stime >= 0)
+ p->prev_stime = max(p->prev_stime, clock_t_to_cputime(stime));
+
+ return p->prev_stime;
+}
+#endif
+
+inline cputime_t task_gtime(struct task_struct *p)
+{
+ return p->gtime;
+}
+
+/*
* This function gets called by the timer code, with HZ frequency.
* We call it with interrupts disabled.
*