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| author | Michal Hocko <mhocko@suse.cz> | 2011-08-24 11:37:48 +0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2011-09-08 13:10:55 +0400 |
| commit | 6beea0cda8ce71c01354e688e5735c47e331e84f (patch) | |
| tree | 7556787053d608134184d98413cce744d54507fc /drivers/cpufreq/cpufreq_conservative.c | |
| parent | ef0e0f5ed9bde6d1e3376169785a463ad2160e6d (diff) | |
| download | linux-6beea0cda8ce71c01354e688e5735c47e331e84f.tar.xz | |
nohz: Fix update_ts_time_stat idle accounting
update_ts_time_stat currently updates idle time even if we are in
iowait loop at the moment. The only real users of the idle counter
(via get_cpu_idle_time_us) are CPU governors and they expect to get
cumulative time for both idle and iowait times.
The value (idle_sleeptime) is also printed to userspace by print_cpu
but it prints both idle and iowait times so the idle part is misleading.
Let's clean this up and fix update_ts_time_stat to account both counters
properly and update consumers of idle to consider iowait time as well.
If we do this we might use get_cpu_{idle,iowait}_time_us from other
contexts as well and we will get expected values.
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Cc: Dave Jones <davej@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Link: http://lkml.kernel.org/r/e9c909c221a8da402c4da07e4cd968c3218f8eb1.1314172057.git.mhocko@suse.cz
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/cpufreq/cpufreq_conservative.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq_conservative.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c index 33b56e5c5c14..c97b468ee9f7 100644 --- a/drivers/cpufreq/cpufreq_conservative.c +++ b/drivers/cpufreq/cpufreq_conservative.c @@ -120,10 +120,12 @@ static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu, static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall) { - u64 idle_time = get_cpu_idle_time_us(cpu, wall); + u64 idle_time = get_cpu_idle_time_us(cpu, NULL); if (idle_time == -1ULL) return get_cpu_idle_time_jiffy(cpu, wall); + else + idle_time += get_cpu_iowait_time_us(cpu, wall); return idle_time; } |