On 17 September 2014 15:25, Peter Zijlstra wrote:
> On Tue, Sep 16, 2014 at 12:14:54AM +0200, Vincent Guittot wrote:
>> On 15 September 2014 13:42, Peter Zijlstra wrote:
>
>> > OK, I've reconsidered _again_, I still don't get it.
>> >
>> > So fundamentally I think its wrong to scale with the capa
On Wed, Sep 17, 2014 at 07:45:27PM +0100, Morten Rasmussen wrote:
> Right. You don't need to scale capacity to determine whether a cpu is
> full or not if you don't have DVFS, but I don't think it hurts if it is
> done right. We need the scaling to figure out how much capacity is
> available.
Mayb
On Tue, Sep 16, 2014 at 12:14:54AM +0200, Vincent Guittot wrote:
> On 15 September 2014 13:42, Peter Zijlstra wrote:
> > OK, I've reconsidered _again_, I still don't get it.
> >
> > So fundamentally I think its wrong to scale with the capacity; it just
> > doesn't make any sense. Consider big.lit
On Wed, Sep 17, 2014 at 07:45:27PM +0100, Morten Rasmussen wrote:
> On Mon, Sep 15, 2014 at 09:01:59PM +0100, Peter Zijlstra wrote:
> > On Mon, Sep 15, 2014 at 03:07:44PM -0400, Nicolas Pitre wrote:
> > > On Mon, 15 Sep 2014, Peter Zijlstra wrote:
> >
> > > Let's suppose a task running on a 1GHz C
On Mon, Sep 15, 2014 at 09:01:59PM +0100, Peter Zijlstra wrote:
> On Mon, Sep 15, 2014 at 03:07:44PM -0400, Nicolas Pitre wrote:
> > On Mon, 15 Sep 2014, Peter Zijlstra wrote:
>
> > Let's suppose a task running on a 1GHz CPU producing a load of 100.
> >
> > The same task on a 100MHz CPU would pro
On 14/09/14 12:41, Peter Zijlstra wrote:
On Thu, Sep 11, 2014 at 07:26:48PM +0200, Vincent Guittot wrote:
On 11 September 2014 18:15, Peter Zijlstra wrote:
On Tue, Aug 26, 2014 at 01:06:54PM +0200, Vincent Guittot wrote:
+static inline int group_has_free_capacity(struct sg_lb_stats *sgs,
+
On Mon, Sep 15, 2014 at 03:07:44PM -0400, Nicolas Pitre wrote:
> On Mon, 15 Sep 2014, Peter Zijlstra wrote:
> Let's suppose a task running on a 1GHz CPU producing a load of 100.
>
> The same task on a 100MHz CPU would produce a load of 1000 because that
> CPU is 10x slower. So to properly evalu
On 16 September 2014 00:14, Vincent Guittot wrote:
> On 15 September 2014 13:42, Peter Zijlstra wrote:
>> On Sun, Sep 14, 2014 at 09:41:56PM +0200, Peter Zijlstra wrote:
>>> On Thu, Sep 11, 2014 at 07:26:48PM +0200, Vincent Guittot wrote:
>>> > On 11 September 2014 18:15, Peter Zijlstra wrote:
>
On 15 September 2014 13:42, Peter Zijlstra wrote:
> On Sun, Sep 14, 2014 at 09:41:56PM +0200, Peter Zijlstra wrote:
>> On Thu, Sep 11, 2014 at 07:26:48PM +0200, Vincent Guittot wrote:
>> > On 11 September 2014 18:15, Peter Zijlstra wrote:
>
>> > > I'm confused about the utilization vs capacity_or
On Mon, 15 Sep 2014, Peter Zijlstra wrote:
> On Sun, Sep 14, 2014 at 09:41:56PM +0200, Peter Zijlstra wrote:
> > On Thu, Sep 11, 2014 at 07:26:48PM +0200, Vincent Guittot wrote:
> > > On 11 September 2014 18:15, Peter Zijlstra wrote:
>
> > > > I'm confused about the utilization vs capacity_orig.
On Sun, Sep 14, 2014 at 09:41:56PM +0200, Peter Zijlstra wrote:
> On Thu, Sep 11, 2014 at 07:26:48PM +0200, Vincent Guittot wrote:
> > On 11 September 2014 18:15, Peter Zijlstra wrote:
> > > I'm confused about the utilization vs capacity_orig. I see how we should
> >
> > 1st point is that I shou
On Sun, Sep 14, 2014 at 09:41:56PM +0200, Peter Zijlstra wrote:
> On Thu, Sep 11, 2014 at 07:26:48PM +0200, Vincent Guittot wrote:
> > On 11 September 2014 18:15, Peter Zijlstra wrote:
> > > On Tue, Aug 26, 2014 at 01:06:54PM +0200, Vincent Guittot wrote:
> > >> +static inline int group_has_free_c
On Thu, Sep 11, 2014 at 07:26:48PM +0200, Vincent Guittot wrote:
> On 11 September 2014 18:15, Peter Zijlstra wrote:
> > On Tue, Aug 26, 2014 at 01:06:54PM +0200, Vincent Guittot wrote:
> >> +static inline int group_has_free_capacity(struct sg_lb_stats *sgs,
> >> + struct lb_en
On 11 September 2014 18:15, Peter Zijlstra wrote:
> On Tue, Aug 26, 2014 at 01:06:54PM +0200, Vincent Guittot wrote:
>> +static inline int group_has_free_capacity(struct sg_lb_stats *sgs,
>> + struct lb_env *env)
>> {
>> + if ((sgs->group_capacity_orig * 100) >
>> +
On Tue, Aug 26, 2014 at 01:06:54PM +0200, Vincent Guittot wrote:
> +static inline int group_has_free_capacity(struct sg_lb_stats *sgs,
> + struct lb_env *env)
> {
> + if ((sgs->group_capacity_orig * 100) >
> + (sgs->group_utilization * env->sd->imbalance
On Tue, Aug 26, 2014 at 01:06:54PM +0200, Vincent Guittot wrote:
> 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 capacity is
> SCHED_CAPACITY_SCALE.
> We can now have a better idea of the capacity of a group o
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 capacity is
SCHED_CAPACITY_SCALE.
We can now have a better idea of the capacity of a group of CPUs and of the
utilization of this group thanks to the rework of group
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