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authorJoel Fernandes <joelaf@google.com>2017-12-21 04:22:45 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-12-28 14:26:54 +0300
commit466a2b42d67644447a1765276259a3ea5531ddff (patch)
treeca896ab907badd58efe681d139fdcecab1491c70 /include/linux/tick.h
parent464e1d5f23cca236b930ef068c328a64cab78fb1 (diff)
downloadlinux-466a2b42d67644447a1765276259a3ea5531ddff.tar.xz
cpufreq: schedutil: Use idle_calls counter of the remote CPU
Since the recent remote cpufreq callback work, its possible that a cpufreq update is triggered from a remote CPU. For single policies however, the current code uses the local CPU when trying to determine if the remote sg_cpu entered idle or is busy. This is incorrect. To remedy this, compare with the nohz tick idle_calls counter of the remote CPU. Fixes: 674e75411fc2 (sched: cpufreq: Allow remote cpufreq callbacks) Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Joel Fernandes <joelaf@google.com> Cc: 4.14+ <stable@vger.kernel.org> # 4.14+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/tick.h')
-rw-r--r--include/linux/tick.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/tick.h b/include/linux/tick.h
index f442d1a42025..7cc35921218e 100644
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -119,6 +119,7 @@ extern void tick_nohz_idle_exit(void);
extern void tick_nohz_irq_exit(void);
extern ktime_t tick_nohz_get_sleep_length(void);
extern unsigned long tick_nohz_get_idle_calls(void);
+extern unsigned long tick_nohz_get_idle_calls_cpu(int cpu);
extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
#else /* !CONFIG_NO_HZ_COMMON */