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[CPUFREQ][3/6] cpufreq: get_cpu_idle_time() changes in ondemand for idle-microaccounting 

Preparatory changes for doing idle micro-accounting in ondemand governor.
get_cpu_idle_time() gets extra parameter and returns idle time and also the
wall time that corresponds to the idle time measurement.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
venkatesh.pallipadi@intel.com 2008-08-04 11:59:09 -07:00 committed by Dave Jones
parent c43aa3bd99
commit 3430502d35
1 changed files with 15 additions and 14 deletions
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29
drivers/cpufreq/cpufreq_ondemand.c
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@ -94,13 +94,13 @@ static struct dbs_tuners {
.powersave_bias = 0, .powersave_bias = 0,
}; };
static inline cputime64_t get_cpu_idle_time(unsigned int cpu) static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
{ {
cputime64_t idle_time; cputime64_t idle_time;
cputime64_t cur_jiffies; cputime64_t cur_wall_time;
cputime64_t busy_time; cputime64_t busy_time;
cur_jiffies = jiffies64_to_cputime64(get_jiffies_64()); cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
busy_time = cputime64_add(kstat_cpu(cpu).cpustat.user, busy_time = cputime64_add(kstat_cpu(cpu).cpustat.user,
kstat_cpu(cpu).cpustat.system); kstat_cpu(cpu).cpustat.system);
@ -113,7 +113,10 @@ static inline cputime64_t get_cpu_idle_time(unsigned int cpu)
kstat_cpu(cpu).cpustat.nice); kstat_cpu(cpu).cpustat.nice);
} }
idle_time = cputime64_sub(cur_jiffies, busy_time); idle_time = cputime64_sub(cur_wall_time, busy_time);
if (wall)
*wall = cur_wall_time;
return idle_time; return idle_time;
} }
@ -277,8 +280,8 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
for_each_online_cpu(j) { for_each_online_cpu(j) {
struct cpu_dbs_info_s *dbs_info; struct cpu_dbs_info_s *dbs_info;
dbs_info = &per_cpu(cpu_dbs_info, j); dbs_info = &per_cpu(cpu_dbs_info, j);
dbs_info->prev_cpu_idle = get_cpu_idle_time(j); dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
dbs_info->prev_cpu_wall = get_jiffies_64(); &dbs_info->prev_cpu_wall);
} }
mutex_unlock(&dbs_mutex); mutex_unlock(&dbs_mutex);
@ -368,21 +371,19 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
int freq_avg; int freq_avg;
j_dbs_info = &per_cpu(cpu_dbs_info, j); j_dbs_info = &per_cpu(cpu_dbs_info, j);
cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
cur_idle_time = get_cpu_idle_time(j, &cur_wall_time);
wall_time = (unsigned int) cputime64_sub(cur_wall_time, wall_time = (unsigned int) cputime64_sub(cur_wall_time,
j_dbs_info->prev_cpu_wall); j_dbs_info->prev_cpu_wall);
j_dbs_info->prev_cpu_wall = cur_wall_time; j_dbs_info->prev_cpu_wall = cur_wall_time;
cur_idle_time = get_cpu_idle_time(j);
idle_time = (unsigned int) cputime64_sub(cur_idle_time, idle_time = (unsigned int) cputime64_sub(cur_idle_time,
j_dbs_info->prev_cpu_idle); j_dbs_info->prev_cpu_idle);
j_dbs_info->prev_cpu_idle = cur_idle_time; j_dbs_info->prev_cpu_idle = cur_idle_time;
if (unlikely(wall_time <= idle_time || if (unlikely(!wall_time || wall_time < idle_time))
(cputime_to_msecs(wall_time) <
dbs_tuners_ins.sampling_rate / (2 * 1000)))) {
continue; continue;
}
load = 100 * (wall_time - idle_time) / wall_time; load = 100 * (wall_time - idle_time) / wall_time;
@ -531,8 +532,8 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
j_dbs_info = &per_cpu(cpu_dbs_info, j); j_dbs_info = &per_cpu(cpu_dbs_info, j);
j_dbs_info->cur_policy = policy; j_dbs_info->cur_policy = policy;
j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j); j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
j_dbs_info->prev_cpu_wall = get_jiffies_64(); &j_dbs_info->prev_cpu_wall);
} }
this_dbs_info->cpu = cpu; this_dbs_info->cpu = cpu;
/* /*