On Wednesday, March 06, 2013 04:15:41 PM Stratos Karafotis wrote:
> On 03/06/2013 03:23 PM, Viresh Kumar wrote:
> > Atleast my poor mind can't make out how. To me it looks like broken now.
> >
> >
> > When can we enter this "if" block, probably only in case where max freq is
> > less than 100 KHz (And because we have freq unit in KHz in cpufreq, its exact
> > value is less than 100). Lets say its 90.
> >
> > So, we will get into your "if" block now and would set freq_target to 90 - 5000.
> >
> > So its broken, isn't it.
> >
> > Rest is fine.
> >
>
> Of course your are right. I'm sorry for this confusion.
>
> Below v2 of this patch.
>
> Thanks,
> Stratos
>
> --------------------------------8<------------------------
> Use an inline function to evaluate freq_target to avoid duplicate code.
>
> Also, define a macro for the default frequency step.
>
> Signed-off-by: Stratos Karafotis <stratosk@xxxxxxxxxxxx>
This one didn't apply for me to linux-pm.git/bleeding-edge. Care to rebase?
Rafael
> ---
> drivers/cpufreq/cpufreq_conservative.c | 27 +++++++++++++++------------
> 1 file changed, 15 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
> index 08be431..3fb921d 100644
> --- a/drivers/cpufreq/cpufreq_conservative.c
> +++ b/drivers/cpufreq/cpufreq_conservative.c
> @@ -28,6 +28,7 @@
> /* Conservative governor macros */
> #define DEF_FREQUENCY_UP_THRESHOLD (80)
> #define DEF_FREQUENCY_DOWN_THRESHOLD (20)
> +#define DEF_FREQUENCY_STEP (5)
> #define DEF_SAMPLING_DOWN_FACTOR (1)
> #define MAX_SAMPLING_DOWN_FACTOR (10)
>
> @@ -39,9 +40,20 @@ static struct cs_dbs_tuners cs_tuners = {
> .down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD,
> .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR,
> .ignore_nice = 0,
> - .freq_step = 5,
> + .freq_step = DEF_FREQUENCY_STEP,
> };
>
> +static inline unsigned int get_freq_target(struct cpufreq_policy *policy)
> +{
> + unsigned int freq_target = (cs_tuners.freq_step * policy->max) / 100;
> +
> + /* max freq cannot be less than 100. But who knows... */
> + if (unlikely(freq_target == 0))
> + freq_target = DEF_FREQUENCY_STEP;
> +
> + return freq_target;
> +}
> +
> /*
> * Every sampling_rate, we check, if current idle time is less than 20%
> * (default), then we try to increase frequency. Every sampling_rate *
> @@ -55,7 +67,6 @@ static void cs_check_cpu(int cpu, unsigned int load)
> {
> struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, cpu);
> struct cpufreq_policy *policy = dbs_info->cdbs.cur_policy;
> - unsigned int freq_target;
>
> /*
> * break out if we 'cannot' reduce the speed as the user might
> @@ -72,13 +83,7 @@ static void cs_check_cpu(int cpu, unsigned int load)
> if (dbs_info->requested_freq == policy->max)
> return;
>
> - freq_target = (cs_tuners.freq_step * policy->max) / 100;
> -
> - /* max freq cannot be less than 100. But who knows.... */
> - if (unlikely(freq_target == 0))
> - freq_target = 5;
> -
> - dbs_info->requested_freq += freq_target;
> + dbs_info->requested_freq += get_freq_target(policy);
> if (dbs_info->requested_freq > policy->max)
> dbs_info->requested_freq = policy->max;
>
> @@ -94,9 +99,7 @@ static void cs_check_cpu(int cpu, unsigned int load)
>
> /* Check for frequency decrease */
> if (load < cs_tuners.down_threshold) {
> - freq_target = (cs_tuners.freq_step * policy->max) / 100;
> -
> - dbs_info->requested_freq -= freq_target;
> + dbs_info->requested_freq -= get_freq_target(policy);
> if (dbs_info->requested_freq < policy->min)
> dbs_info->requested_freq = policy->min;
>
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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