From 54c9a35d9faef06e00e2a941eb8fe674f1886901 Mon Sep 17 00:00:00 2001 From: "Pallipadi, Venkatesh" Date: Wed, 11 Nov 2009 16:50:29 -0800 Subject: [CPUFREQ] Resolve time unit thinko in ondemand/conservative govs ondemand and conservative governors are messing up time units in the code path where NO_HZ is not enabled and ignore_nice is set. The walltime idletime stored is in jiffies and nice time calculation is happening in microseconds. The problem was reported and diagnosed by Alexander here. http://marc.info/?l=linux-kernel&m=125752550404513&w=2 The patch below fixes this thinko. Reported-by: Alexander Miller Tested-by: Alexander Miller Signed-off-by: Venkatesh Pallipadi Signed-off-by: Dave Jones --- drivers/cpufreq/cpufreq_conservative.c | 4 ++-- drivers/cpufreq/cpufreq_ondemand.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/cpufreq') diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c index bc33ddc9c97c..c7b081b839ff 100644 --- a/drivers/cpufreq/cpufreq_conservative.c +++ b/drivers/cpufreq/cpufreq_conservative.c @@ -116,9 +116,9 @@ static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu, idle_time = cputime64_sub(cur_wall_time, busy_time); if (wall) - *wall = cur_wall_time; + *wall = (cputime64_t)jiffies_to_usecs(cur_wall_time); - return idle_time; + return (cputime64_t)jiffies_to_usecs(idle_time);; } static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall) diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index 071699de50ee..4b34ade2332b 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -133,9 +133,9 @@ static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu, idle_time = cputime64_sub(cur_wall_time, busy_time); if (wall) - *wall = cur_wall_time; + *wall = (cputime64_t)jiffies_to_usecs(cur_wall_time); - return idle_time; + return (cputime64_t)jiffies_to_usecs(idle_time); } static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall) -- cgit v1.2.3