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authorPallipadi, Venkatesh <venkatesh.pallipadi@intel.com>2009-11-11 16:50:29 -0800
committerDave Jones <davej@redhat.com>2009-11-17 23:15:04 -0500
commit54c9a35d9faef06e00e2a941eb8fe674f1886901 (patch)
tree928bbd03871e60f79edd0dd522ac48a598d17cb6
parent8dca15e40889e5d5e9655b03ba79c26200f760ce (diff)
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[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 <Miller@fmi.uni-stuttgart.de> Tested-by: Alexander Miller <Miller@fmi.uni-stuttgart.de> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
-rw-r--r--drivers/cpufreq/cpufreq_conservative.c4
-rw-r--r--drivers/cpufreq/cpufreq_ondemand.c4
2 files changed, 4 insertions, 4 deletions
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index bc33ddc9c97..c7b081b839f 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 071699de50e..4b34ade2332 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)