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authorvenkatesh.pallipadi@intel.com <venkatesh.pallipadi@intel.com>2008-08-04 14:59:11 -0400
committerDave Jones <davej@redhat.com>2008-10-09 13:52:44 -0400
commit8083e4ad970e4eb567e31037060cdd4ba346f0c0 (patch)
tree330e6dc1dbb7c7db13d14f3681d4a51f62708329 /kernel/time/tick-sched.c
parente9d95bf7eb929b9ddc9af9f4327b76c77ed4c7d6 (diff)
[CPUFREQ][5/6] cpufreq: Changes to get_cpu_idle_time_us(), used by ondemand governor
export get_cpu_idle_time_us() for it to be used in ondemand governor. Last update time can be current time when the CPU is currently non-idle, accounting for the busy time since last idle. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'kernel/time/tick-sched.c')
-rw-r--r--kernel/time/tick-sched.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index cb02324bdb88..a4d219398167 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -20,6 +20,7 @@
20#include <linux/profile.h> 20#include <linux/profile.h>
21#include <linux/sched.h> 21#include <linux/sched.h>
22#include <linux/tick.h> 22#include <linux/tick.h>
23#include <linux/module.h>
23 24
24#include <asm/irq_regs.h> 25#include <asm/irq_regs.h>
25 26
@@ -190,9 +191,17 @@ u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
190{ 191{
191 struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu); 192 struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
192 193
193 *last_update_time = ktime_to_us(ts->idle_lastupdate); 194 if (!tick_nohz_enabled)
195 return -1;
196
197 if (ts->idle_active)
198 *last_update_time = ktime_to_us(ts->idle_lastupdate);
199 else
200 *last_update_time = ktime_to_us(ktime_get());
201
194 return ktime_to_us(ts->idle_sleeptime); 202 return ktime_to_us(ts->idle_sleeptime);
195} 203}
204EXPORT_SYMBOL_GPL(get_cpu_idle_time_us);
196 205
197/** 206/**
198 * tick_nohz_stop_sched_tick - stop the idle tick from the idle task 207 * tick_nohz_stop_sched_tick - stop the idle tick from the idle task