From 50927400709d1bbc391be1bc5a07f955f2586461 Mon Sep 17 00:00:00 2001 From: Arjan van de Ven Date: Sun, 9 May 2010 08:22:08 -0700 Subject: [PATCH] --- yaml --- r: 191424 b: refs/heads/master c: b1f724c3055fa75a31d272222213647547a2d3d4 h: refs/heads/master v: v3 --- [refs] | 2 +- trunk/kernel/time/tick-sched.c | 14 ++++++++++++++ 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/[refs] b/[refs] index a3a3240606bd..d192385ca500 100644 --- a/[refs] +++ b/[refs] @@ -1,2 +1,2 @@ --- -refs/heads/master: e7858f52a5cb868289a72264534a1f05f3340c6c +refs/heads/master: b1f724c3055fa75a31d272222213647547a2d3d4 diff --git a/trunk/kernel/time/tick-sched.c b/trunk/kernel/time/tick-sched.c index f25735a767af..358822ee32d5 100644 --- a/trunk/kernel/time/tick-sched.c +++ b/trunk/kernel/time/tick-sched.c @@ -179,6 +179,20 @@ static ktime_t tick_nohz_start_idle(struct tick_sched *ts) return now; } +/** + * get_cpu_idle_time_us - get the total idle time of a cpu + * @cpu: CPU number to query + * @last_update_time: variable to store update time in + * + * Return the cummulative idle time (since boot) for a given + * CPU, in microseconds. The idle time returned includes + * the iowait time (unlike what "top" and co report). + * + * This time is measured via accounting rather than sampling, + * and is as accurate as ktime_get() is. + * + * This function returns -1 if NOHZ is not enabled. + */ u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time) { struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);