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[CPUFREQ][1/2] ondemand: updated tune for hardware coordination

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Try to make dbs_check_cpu() call on all CPUs at the same jiffy.
This will help when multiple cores share P-states via Hardware Coordination.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi at intel.com>
Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy at intel.com>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Alexey Starikovskiy 2006-07-31 22:25:20 +04:00 committed by Dave Jones
parent cd87847979
commit 1ce28d6b19
1 changed files with 8 additions and 5 deletions
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13
drivers/cpufreq/cpufreq_ondemand.c
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@ -305,6 +305,9 @@ static void do_dbs_timer(void *data)
{ {
unsigned int cpu = smp_processor_id(); unsigned int cpu = smp_processor_id();
struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, cpu); struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, cpu);
/* We want all CPUs to do sampling nearly on same jiffy */
int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
delay -= jiffies % delay;
if (!dbs_info->enable) if (!dbs_info->enable)
return; return;
@ -312,18 +315,18 @@ static void do_dbs_timer(void *data)
lock_cpu_hotplug(); lock_cpu_hotplug();
dbs_check_cpu(dbs_info); dbs_check_cpu(dbs_info);
unlock_cpu_hotplug(); unlock_cpu_hotplug();
queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay);
usecs_to_jiffies(dbs_tuners_ins.sampling_rate));
} }
static inline void dbs_timer_init(unsigned int cpu) static inline void dbs_timer_init(unsigned int cpu)
{ {
struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, cpu); struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, cpu);
/* We want all CPUs to do sampling nearly on same jiffy */
int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
delay -= jiffies % delay;
INIT_WORK(&dbs_info->work, do_dbs_timer, 0); INIT_WORK(&dbs_info->work, do_dbs_timer, 0);
queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay);
usecs_to_jiffies(dbs_tuners_ins.sampling_rate));
return;
} }
static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info) static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)