lkml.org 
[lkml]   [2015]   [Apr]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v6 1/2] nohz: add tick_nohz_full_add_cpus_to() and _remove_cpus_from() APIs
On Thu, Apr 09, 2015 at 02:01:45PM -0400, Chris Metcalf wrote:
> The "removes_cpus_from" API is useful, for example, to modify a cpumask
> to avoid the nohz cores so that interrupts aren't sent to them.
>
> Likewise the "add_cpus_to" API is useful to modify a cpumask indicating
> some special nohz-type functionality so that the nohz cores are
> automatically added to that set.
>
> Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
> ---
> v6: I think we may finally have accessor names that are OK
>
> v5: (skipped this patch)
>
> v4: update accessor names to make them clearer [PeterZ]
>
> v3: no change here, just in part 2/2.
>
> v2: put the "...set_cpus" API together with the change to
> init_sched_domains() so that they can go into the timer tree
> independently of other changes in my tree.
>
> include/linux/tick.h | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/include/linux/tick.h b/include/linux/tick.h
> index 9c085dc12ae9..8d1754c0f694 100644
> --- a/include/linux/tick.h
> +++ b/include/linux/tick.h
> @@ -186,6 +186,18 @@ static inline bool tick_nohz_full_cpu(int cpu)
> return cpumask_test_cpu(cpu, tick_nohz_full_mask);
> }
>
> +static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)

Or tick_nohz_full_affine() ?

> +{
> + if (tick_nohz_full_enabled())
> + cpumask_or(mask, mask, tick_nohz_full_mask);
> +}
> +
> +static inline void tick_nohz_full_remove_cpus_from(struct cpumask *mask)
> +{
> + if (tick_nohz_full_enabled())
> + cpumask_andnot(mask, mask, tick_nohz_full_mask);
> +}
> +
> extern void __tick_nohz_full_check(void);
> extern void tick_nohz_full_kick(void);
> extern void tick_nohz_full_kick_cpu(int cpu);
> @@ -194,6 +206,8 @@ extern void __tick_nohz_task_switch(struct task_struct *tsk);
> #else
> static inline bool tick_nohz_full_enabled(void) { return false; }
> static inline bool tick_nohz_full_cpu(int cpu) { return false; }
> +static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { }
> +static inline void tick_nohz_full_remove_cpus_from(struct cpumask *mask) { }
> static inline void __tick_nohz_full_check(void) { }
> static inline void tick_nohz_full_kick_cpu(int cpu) { }
> static inline void tick_nohz_full_kick(void) { }
> --
> 2.1.2
>


\
 
 \ /
  Last update: 2015-04-10 04:01    [W:0.111 / U:18.104 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site