1 From: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
2 Subject: export get_cpu_idle_time_us()
4 export get_cpu_idle_time_us() for it to be used in ondemand governor.
5 Last update time can be current time when the CPU is currently non-idle,
6 accounting for the busy time since last idle.
8 Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
9 Signed-off-by: Thomas Renninger <trenn@suse.de>
12 include/linux/tick.h | 2 +-
13 kernel/time/tick-sched.c | 11 ++++++++++-
14 2 files changed, 11 insertions(+), 2 deletions(-)
16 Index: cpufreq.git/kernel/time/tick-sched.c
17 ===================================================================
18 --- cpufreq.git.orig/kernel/time/tick-sched.c 2008-07-31 10:04:55.000000000 -0700
19 +++ cpufreq.git/kernel/time/tick-sched.c 2008-07-31 14:52:18.000000000 -0700
21 #include <linux/profile.h>
22 #include <linux/sched.h>
23 #include <linux/tick.h>
24 +#include <linux/module.h>
26 #include <asm/irq_regs.h>
28 @@ -184,9 +185,17 @@ u64 get_cpu_idle_time_us(int cpu, u64 *l
30 struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
32 - *last_update_time = ktime_to_us(ts->idle_lastupdate);
33 + if (!tick_nohz_enabled)
36 + if (ts->idle_active)
37 + *last_update_time = ktime_to_us(ts->idle_lastupdate);
39 + *last_update_time = ktime_to_us(ktime_get());
41 return ktime_to_us(ts->idle_sleeptime);
43 +EXPORT_SYMBOL_GPL(get_cpu_idle_time_us);
46 * tick_nohz_stop_sched_tick - stop the idle tick from the idle task
47 Index: cpufreq.git/include/linux/tick.h
48 ===================================================================
49 --- cpufreq.git.orig/include/linux/tick.h 2008-07-31 10:04:54.000000000 -0700
50 +++ cpufreq.git/include/linux/tick.h 2008-07-31 14:52:18.000000000 -0700
51 @@ -123,7 +123,7 @@ static inline ktime_t tick_nohz_get_slee
54 static inline void tick_nohz_stop_idle(int cpu) { }
55 -static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return 0; }
56 +static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }