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authorPallipadi, Venkatesh <venkatesh.pallipadi@intel.com>2009-11-11 19:50:29 -0500
committerDave Jones <davej@redhat.com>2009-11-17 23:15:04 -0500
commit54c9a35d9faef06e00e2a941eb8fe674f1886901 (patch)
tree928bbd03871e60f79edd0dd522ac48a598d17cb6 /drivers/cpufreq/cpufreq_conservative.c
parent8dca15e40889e5d5e9655b03ba79c26200f760ce (diff)
[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>
Diffstat (limited to 'drivers/cpufreq/cpufreq_conservative.c')
-rw-r--r--drivers/cpufreq/cpufreq_conservative.c4
1 files changed, 2 insertions, 2 deletions
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,
116 116
117 idle_time = cputime64_sub(cur_wall_time, busy_time); 117 idle_time = cputime64_sub(cur_wall_time, busy_time);
118 if (wall) 118 if (wall)
119 *wall = cur_wall_time; 119 *wall = (cputime64_t)jiffies_to_usecs(cur_wall_time);
120 120
121 return idle_time; 121 return (cputime64_t)jiffies_to_usecs(idle_time);;
122} 122}
123 123
124static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall) 124static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)