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| author | Alexey Starikovskiy <alexey_y_starikovskiy@linux.intel.com> | 2006-07-31 22:25:20 +0400 |
|---|---|---|
| committer | Dave Jones <davej@redhat.com> | 2006-08-11 17:59:56 -0400 |
| commit | 1ce28d6b19112a7c76af8e971e2de3109d19a943 (patch) | |
| tree | 5fe089fa4b9851ca4c975a5e13f636f95fa43078 | |
| parent | cd878479792cc1e4bc9d62ed0ef2c4454743848c (diff) | |
| download | linux-1ce28d6b19112a7c76af8e971e2de3109d19a943.tar.gz linux-1ce28d6b19112a7c76af8e971e2de3109d19a943.tar.bz2 linux-1ce28d6b19112a7c76af8e971e2de3109d19a943.zip | |
[CPUFREQ][1/2] ondemand: updated tune for hardware coordination
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>
| -rw-r--r-- | drivers/cpufreq/cpufreq_ondemand.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index 52cf1f021825..f507a869acbc 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -305,6 +305,9 @@ static void do_dbs_timer(void *data) { unsigned int cpu = smp_processor_id(); 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) return; @@ -312,18 +315,18 @@ static void do_dbs_timer(void *data) lock_cpu_hotplug(); dbs_check_cpu(dbs_info); unlock_cpu_hotplug(); - queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, - usecs_to_jiffies(dbs_tuners_ins.sampling_rate)); + queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay); } static inline void dbs_timer_init(unsigned int 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); - queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, - usecs_to_jiffies(dbs_tuners_ins.sampling_rate)); - return; + queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay); } static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info) |