src/patches/suse-2.6.27.25/patches.drivers/cpufreq_changes_to_get_cpu_idle_us_5.patch

   1 From: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
   2 Subject: export get_cpu_idle_time_us()
   3
   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.
   7
   8 Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
   9 Signed-off-by: Thomas Renninger <trenn@suse.de>
  10
  11 ---
  12  include/linux/tick.h     |    2 +-
  13  kernel/time/tick-sched.c |   11 ++++++++++-
  14  2 files changed, 11 insertions(+), 2 deletions(-)
  15
  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
  20 @@ -20,6 +20,7 @@
  21  #include <linux/profile.h>
  22  #include <linux/sched.h>
  23  #include <linux/tick.h>
  24 +#include <linux/module.h>
  25
  26  #include <asm/irq_regs.h>
  27
  28 @@ -184,9 +185,17 @@ u64 get_cpu_idle_time_us(int cpu, u64 *l
  29  {
  30         struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
  31
  32 -       *last_update_time = ktime_to_us(ts->idle_lastupdate);
  33 +       if (!tick_nohz_enabled)
  34 +               return -1;
  35 +
  36 +       if (ts->idle_active)
  37 +               *last_update_time = ktime_to_us(ts->idle_lastupdate);
  38 +       else
  39 +               *last_update_time = ktime_to_us(ktime_get());
  40 +
  41         return ktime_to_us(ts->idle_sleeptime);
  42  }
  43 +EXPORT_SYMBOL_GPL(get_cpu_idle_time_us);
  44
  45  /**
  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
  52         return len;
  53  }
  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; }
  57  # endif /* !NO_HZ */
  58
  59  #endif
  60
  61 --