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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>
This commit is contained in:
Pallipadi, Venkatesh 2009-11-11 16:50:29 -08:00 committed by Dave Jones
parent 8dca15e408
commit 54c9a35d9f
2 changed files with 4 additions and 4 deletions
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4
drivers/cpufreq/cpufreq_conservative.c
View File

@ -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)

4
drivers/cpufreq/cpufreq_ondemand.c
View File

@ -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)