On 23 November 2014 at 02:03, Wanpeng Li wrote:
> Hi Vincent,
> On 10/9/14, 10:18 PM, Vincent Guittot wrote:
>>
>> On 9 October 2014 14:16, Peter Zijlstra wrote:
>>>
>>> On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
+static inline bool
+group_has_capacity(struct
On 23 November 2014 at 02:03, Wanpeng Li kernel...@gmail.com wrote:
Hi Vincent,
On 10/9/14, 10:18 PM, Vincent Guittot wrote:
On 9 October 2014 14:16, Peter Zijlstra pet...@infradead.org wrote:
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
+static inline bool
Hi Vincent,
On 10/9/14, 10:18 PM, Vincent Guittot wrote:
On 9 October 2014 14:16, Peter Zijlstra wrote:
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
+static inline bool
+group_has_capacity(struct lb_env *env, struct sg_lb_stats *sgs)
{
+ if ((sgs->group_capacity *
Hi Vincent,
On 10/9/14, 10:18 PM, Vincent Guittot wrote:
On 9 October 2014 14:16, Peter Zijlstra pet...@infradead.org wrote:
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
+static inline bool
+group_has_capacity(struct lb_env *env, struct sg_lb_stats *sgs)
{
+ if
On 9 October 2014 16:58, Peter Zijlstra wrote:
> On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
>> @@ -6214,17 +6178,21 @@ static inline void update_sd_lb_stats(struct lb_env
>> *env, struct sd_lb_stats *sd
>>
>> /*
>>* In case the child domain
On 9 October 2014 16:58, Peter Zijlstra pet...@infradead.org wrote:
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
@@ -6214,17 +6178,21 @@ static inline void update_sd_lb_stats(struct lb_env
*env, struct sd_lb_stats *sd
/*
* In case the child
On 10 October 2014 09:17, Vincent Guittot wrote:
>
> yes i think it latter because it give a more stable view of the
s/latter/matter/
> "overload state" and "have free capacity state" of the CPU.
> One additional point is that the imbalance_pct will ensure that a
> cpu/group will not been seen
On 9 October 2014 17:18, Peter Zijlstra wrote:
> On Thu, Oct 09, 2014 at 04:18:02PM +0200, Vincent Guittot wrote:
>> On 9 October 2014 14:16, Peter Zijlstra wrote:
>> > On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
>> >> +static inline bool
>> >> +group_has_capacity(struct
On 9 October 2014 17:18, Peter Zijlstra pet...@infradead.org wrote:
On Thu, Oct 09, 2014 at 04:18:02PM +0200, Vincent Guittot wrote:
On 9 October 2014 14:16, Peter Zijlstra pet...@infradead.org wrote:
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
+static inline bool
On 10 October 2014 09:17, Vincent Guittot vincent.guit...@linaro.org wrote:
yes i think it latter because it give a more stable view of the
s/latter/matter/
overload state and have free capacity state of the CPU.
One additional point is that the imbalance_pct will ensure that a
cpu/group
On Thu, Oct 09, 2014 at 04:18:02PM +0200, Vincent Guittot wrote:
> On 9 October 2014 14:16, Peter Zijlstra wrote:
> > On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
> >> +static inline bool
> >> +group_has_capacity(struct lb_env *env, struct sg_lb_stats *sgs)
> >> {
> >> +
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
> @@ -6214,17 +6178,21 @@ static inline void update_sd_lb_stats(struct lb_env
> *env, struct sd_lb_stats *sd
>
> /*
>* In case the child domain prefers tasks go to siblings
> - * first,
On 9 October 2014 16:16, Peter Zijlstra wrote:
> On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
>> @@ -6214,17 +6178,21 @@ static inline void update_sd_lb_stats(struct lb_env
>> *env, struct sd_lb_stats *sd
>>
>> /*
>>* In case the child domain
On 9 October 2014 14:16, Peter Zijlstra wrote:
> On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
>> +static inline bool
>> +group_has_capacity(struct lb_env *env, struct sg_lb_stats *sgs)
>> {
>> + if ((sgs->group_capacity * 100) >
>> + (sgs->group_usage
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
> @@ -6214,17 +6178,21 @@ static inline void update_sd_lb_stats(struct lb_env
> *env, struct sd_lb_stats *sd
>
> /*
>* In case the child domain prefers tasks go to siblings
> + * first,
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
> +static inline bool
> +group_has_capacity(struct lb_env *env, struct sg_lb_stats *sgs)
> {
> + if ((sgs->group_capacity * 100) >
> + (sgs->group_usage * env->sd->imbalance_pct))
> + return true;
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
+static inline bool
+group_has_capacity(struct lb_env *env, struct sg_lb_stats *sgs)
{
+ if ((sgs-group_capacity * 100)
+ (sgs-group_usage * env-sd-imbalance_pct))
+ return true;
Why the
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
@@ -6214,17 +6178,21 @@ static inline void update_sd_lb_stats(struct lb_env
*env, struct sd_lb_stats *sd
/*
* In case the child domain prefers tasks go to siblings
+ * first, lower
On 9 October 2014 14:16, Peter Zijlstra pet...@infradead.org wrote:
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
+static inline bool
+group_has_capacity(struct lb_env *env, struct sg_lb_stats *sgs)
{
+ if ((sgs-group_capacity * 100)
+
On 9 October 2014 16:16, Peter Zijlstra pet...@infradead.org wrote:
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
@@ -6214,17 +6178,21 @@ static inline void update_sd_lb_stats(struct lb_env
*env, struct sd_lb_stats *sd
/*
* In case the child
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
@@ -6214,17 +6178,21 @@ static inline void update_sd_lb_stats(struct lb_env
*env, struct sd_lb_stats *sd
/*
* In case the child domain prefers tasks go to siblings
- * first, lower
On Thu, Oct 09, 2014 at 04:18:02PM +0200, Vincent Guittot wrote:
On 9 October 2014 14:16, Peter Zijlstra pet...@infradead.org wrote:
On Tue, Oct 07, 2014 at 02:13:36PM +0200, Vincent Guittot wrote:
+static inline bool
+group_has_capacity(struct lb_env *env, struct sg_lb_stats *sgs)
{
+
The scheduler tries to compute how many tasks a group of CPUs can handle by
assuming that a task's load is SCHED_LOAD_SCALE and a CPU's capacity is
SCHED_CAPACITY_SCALE but the capacity_factor is hardly working for SMT system,
it sometimes works for big cores but fails to do the right thing for
The scheduler tries to compute how many tasks a group of CPUs can handle by
assuming that a task's load is SCHED_LOAD_SCALE and a CPU's capacity is
SCHED_CAPACITY_SCALE but the capacity_factor is hardly working for SMT system,
it sometimes works for big cores but fails to do the right thing for
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