diff options
| author | venkatesh.pallipadi@intel.com <venkatesh.pallipadi@intel.com> | 2008-08-04 11:59:10 -0700 |
|---|---|---|
| committer | Dave Jones <davej@redhat.com> | 2008-10-09 13:52:44 -0400 |
| commit | e9d95bf7eb929b9ddc9af9f4327b76c77ed4c7d6 (patch) | |
| tree | 09206190529c527b36509830d735fc77e5cec74c /drivers | |
| parent | 3430502d356284ff4f7782d75bb01a402fd3d45e (diff) | |
[CPUFREQ][4/6] cpufreq_ondemand: Parameterize down differential
Use a parameter for down differential, instead of hardcoded 10%. Follow-on
patch changes the down-differential dynamically, based on whether
we are using idle micro-accounting or not.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/cpufreq/cpufreq_ondemand.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index b935092aab2..3f898606e68 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -24,6 +24,7 @@ * It helps to keep variable names smaller, simpler */ +#define DEF_FREQUENCY_DOWN_DIFFERENTIAL (10) #define DEF_FREQUENCY_UP_THRESHOLD (80) #define MIN_FREQUENCY_UP_THRESHOLD (11) #define MAX_FREQUENCY_UP_THRESHOLD (100) @@ -86,10 +87,12 @@ static struct workqueue_struct *kondemand_wq; static struct dbs_tuners { unsigned int sampling_rate; unsigned int up_threshold; + unsigned int down_differential; unsigned int ignore_nice; unsigned int powersave_bias; } dbs_tuners_ins = { .up_threshold = DEF_FREQUENCY_UP_THRESHOLD, + .down_differential = DEF_FREQUENCY_DOWN_DIFFERENTIAL, .ignore_nice = 0, .powersave_bias = 0, }; @@ -424,9 +427,13 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info) * can support the current CPU usage without triggering the up * policy. To be safe, we focus 10 points under the threshold. */ - if (max_load_freq < (dbs_tuners_ins.up_threshold - 10) * policy->cur) { + if (max_load_freq < + (dbs_tuners_ins.up_threshold - dbs_tuners_ins.down_differential) * + policy->cur) { unsigned int freq_next; - freq_next = max_load_freq / (dbs_tuners_ins.up_threshold - 10); + freq_next = max_load_freq / + (dbs_tuners_ins.up_threshold - + dbs_tuners_ins.down_differential); if (!dbs_tuners_ins.powersave_bias) { __cpufreq_driver_target(policy, freq_next, |