Eric Lee / smarc-ti-linux-kernel

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Commit 8083e4ad970e4eb567e31037060cdd4ba346f0c0

Authored by venkatesh.pallipadi@intel.com
Committed by Dave Jones
1 parent e9d95bf7eb

[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>

Showing 2 changed files with 11 additions and 2 deletions Side-by-side Diff

include/linux/tick.h
Diff comments   View file @ 8083e4a
... ... @@ -126,7 +126,7 @@
126 126 return len;
127 127 }
128 128 static inline void tick_nohz_stop_idle(int cpu) { }
129   -static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return 0; }
  129 +static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
130 130 # endif /* !NO_HZ */
131 131  
132 132 #endif
kernel/time/tick-sched.c
Diff comments   View file @ 8083e4a
... ... @@ -20,6 +20,7 @@
20 20 #include <linux/profile.h>
21 21 #include <linux/sched.h>
22 22 #include <linux/tick.h>
  23 +#include <linux/module.h>
23 24  
24 25 #include <asm/irq_regs.h>
25 26  
26 27  
... ... @@ -190,9 +191,17 @@
190 191 {
191 192 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 +
194 202 return ktime_to_us(ts->idle_sleeptime);
195 203 }
  204 +EXPORT_SYMBOL_GPL(get_cpu_idle_time_us);
196 205  
197 206 /**
198 207 * tick_nohz_stop_sched_tick - stop the idle tick from the idle task