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49 lines
1.6 KiB
Diff
49 lines
1.6 KiB
Diff
>From 6f9df3bc6571d6545c552151f408d69265e15f92 Mon Sep 17 00:00:00 2001
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From: Arjan van de Ven <arjan@linux.intel.com>
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Date: Sun, 18 Apr 2010 10:25:19 -0700
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Subject: [PATCH 1/7] sched: add a comment to get_cpu_idle_time_us()
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Patch-mainline: in -mm tree as of 19 Apr 2010
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The exported function get_cpu_idle_time_us() has no comment
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describing it; add a kerneldoc comment
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Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
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---
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kernel/time/tick-sched.c | 14 ++++++++++++++
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1 files changed, 14 insertions(+), 0 deletions(-)
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diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
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index f992762..54dc155 100644
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--- a/kernel/time/tick-sched.c
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+++ b/kernel/time/tick-sched.c
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@@ -179,6 +179,20 @@ static ktime_t tick_nohz_start_idle(struct tick_sched *ts)
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return now;
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}
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+/**
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+ * get_cpu_idle_time_us - get the total idle time of a cpu
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+ * @cpu: CPU number to query
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+ * @last_update_time: variable to store update time in
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+ *
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+ * Return the cummulative idle time (since boot) for a given
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+ * CPU, in microseconds. The idle time returned includes
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+ * the iowait time (unlike what "top" and co report).
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+ *
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+ * This time is measured via accounting rather than sampling,
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+ * and is as accurate as ktime_get() is.
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+ *
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+ * This function returns -1 if NOHZ is not enabled.
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+ */
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u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
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{
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struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
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--
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1.6.2.5
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