On Wed, Apr 13, 2016 at 03:56:52PM +0200, Frederic Weisbecker wrote:
> Some code in cpu load update only concern NO_HZ configs but it is
> built on all configurations. When NO_HZ isn't built, that code is harmless
> but just happens to take some useless ressources in CPU and memory:
>
> 1) one use
Some code in cpu load update only concern NO_HZ configs but it is
built on all configurations. When NO_HZ isn't built, that code is harmless
but just happens to take some useless ressources in CPU and memory:
1) one useless field in struct rq
2) jiffies record on every tick that is never used (cpu
On Mon, Apr 11, 2016 at 08:21:31PM +0200, Frederic Weisbecker wrote:
> On Mon, Apr 11, 2016 at 10:53:01AM -0400, Chris Metcalf wrote:
> > On 4/11/2016 9:18 AM, Frederic Weisbecker wrote:
> > >So I tried and it warns about the unused variable tickless_load, so I
> > >would need two scattered ifdeffe
On Mon, Apr 11, 2016 at 10:53:01AM -0400, Chris Metcalf wrote:
> On 4/11/2016 9:18 AM, Frederic Weisbecker wrote:
> >So I tried and it warns about the unused variable tickless_load, so I
> >would need two scattered ifdeffery in the function:
> >
> >@@ -4528,7 +4529,9 @@ decay_load_missed(unsigned l
On 4/11/2016 9:18 AM, Frederic Weisbecker wrote:
So I tried and it warns about the unused variable tickless_load, so I
would need two scattered ifdeffery in the function:
@@ -4528,7 +4529,9 @@ decay_load_missed(unsigned long load, unsigned long
missed_updates, int idx)
static void cpu_load_up
On Fri, Apr 08, 2016 at 07:44:14PM +0200, Peter Zijlstra wrote:
> On Fri, Apr 08, 2016 at 02:55:22PM +0200, Frederic Weisbecker wrote:
> > > > @@ -4540,17 +4568,8 @@ static void cpu_load_update(struct rq *this_rq,
> > > > unsigned long this_load,
> > > >
> > > > /* scale is effec
On Fri, Apr 08, 2016 at 02:55:22PM +0200, Frederic Weisbecker wrote:
> > > @@ -4540,17 +4568,8 @@ static void cpu_load_update(struct rq *this_rq,
> > > unsigned long this_load,
> > >
> > > /* scale is effectively 1 << i now, and >> i divides by scale */
> > >
> > > - old_load
On Fri, Apr 08, 2016 at 12:48:21PM +0200, Peter Zijlstra wrote:
> On Fri, Apr 08, 2016 at 03:07:13AM +0200, Frederic Weisbecker wrote:
> > index 4c522a7..59a2821 100644
> > --- a/kernel/sched/core.c
> > +++ b/kernel/sched/core.c
> > @@ -7327,8 +7327,9 @@ void __init sched_init(void)
> >
> >
On Fri, Apr 08, 2016 at 03:07:13AM +0200, Frederic Weisbecker wrote:
> index 4c522a7..59a2821 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -7327,8 +7327,9 @@ void __init sched_init(void)
>
> for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
> rq->cp
Some code in cpu load update only concern NO_HZ configs but it is
built on all configurations. When NO_HZ isn't built, that code is harmless
but just happens to take some useless ressources in CPU and memory:
1) one useless field in struct rq
2) jiffies record on every tick that is never used (cpu
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