Fix two typos:

 - There's no such thing as 'nohz_balancing_kick', the
   flag is named 'BALANCE' and is capitalized:  NOHZ_BALANCE_KICK.

 - Likewise there's no such thing as a 'pending nohz_balance_kick'
   either, the NOHZ_BALANCE_KICK flag is all upper-case.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Valentin Schneider <vschneid@redhat.com>
---
 kernel/sched/fair.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 934ace69eb30..4c46bffb6a7a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -12410,14 +12410,14 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
 
 /*
  * run_rebalance_domains is triggered when needed from the scheduler tick.
- * Also triggered for nohz idle balancing (with nohz_balancing_kick set).
+ * Also triggered for NOHZ idle balancing (with NOHZ_BALANCE_KICK set).
  */
 static __latent_entropy void run_rebalance_domains(struct softirq_action *h)
 {
 	struct rq *this_rq = this_rq();
 	enum cpu_idle_type idle = this_rq->idle_balance;
 	/*
-	 * If this CPU has a pending nohz_balance_kick, then do the
+	 * If this CPU has a pending NOHZ_BALANCE_KICK, then do the
 	 * balancing on behalf of the other idle CPUs whose ticks are
 	 * stopped. Do nohz_idle_balance *before* rebalance_domains to
 	 * give the idle CPUs a chance to load balance. Else we may
-- 
2.40.1

On Mon, 4 Mar 2024 at 10:48, Ingo Molnar <mingo@kernel.org> wrote:
>
> Fix two typos:
>
>  - There's no such thing as 'nohz_balancing_kick', the
>    flag is named 'BALANCE' and is capitalized:  NOHZ_BALANCE_KICK.
>
>  - Likewise there's no such thing as a 'pending nohz_balance_kick'
>    either, the NOHZ_BALANCE_KICK flag is all upper-case.
>
> Signed-off-by: Ingo Molnar <mingo@kernel.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Vincent Guittot <vincent.guittot@linaro.org>
> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Valentin Schneider <vschneid@redhat.com>
> ---
>  kernel/sched/fair.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 934ace69eb30..4c46bffb6a7a 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -12410,14 +12410,14 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
>
>  /*
>   * run_rebalance_domains is triggered when needed from the scheduler tick.
> - * Also triggered for nohz idle balancing (with nohz_balancing_kick set).

I think it should be nohz_balancer_kick() instead of nohz_balancing_kick


> + * Also triggered for NOHZ idle balancing (with NOHZ_BALANCE_KICK set).

In fact, this can be triggered even without NOHZ_BALANCE_KICK. Any of
the below can trigger this
  - NOHZ_BALANCE_KICK
  - NOHZ_STATS_KICK
  - NOHZ_NEXT_KICK

>   */
>  static __latent_entropy void run_rebalance_domains(struct softirq_action *h)
>  {
>         struct rq *this_rq = this_rq();
>         enum cpu_idle_type idle = this_rq->idle_balance;
>         /*
> -        * If this CPU has a pending nohz_balance_kick, then do the
> +        * If this CPU has a pending NOHZ_BALANCE_KICK, then do the
>          * balancing on behalf of the other idle CPUs whose ticks are
>          * stopped. Do nohz_idle_balance *before* rebalance_domains to
>          * give the idle CPUs a chance to load balance. Else we may
> --
> 2.40.1
>

* Vincent Guittot <vincent.guittot@linaro.org> wrote:

> On Mon, 4 Mar 2024 at 10:48, Ingo Molnar <mingo@kernel.org> wrote:
> >
> > Fix two typos:
> >
> >  - There's no such thing as 'nohz_balancing_kick', the
> >    flag is named 'BALANCE' and is capitalized:  NOHZ_BALANCE_KICK.
> >
> >  - Likewise there's no such thing as a 'pending nohz_balance_kick'
> >    either, the NOHZ_BALANCE_KICK flag is all upper-case.
> >
> > Signed-off-by: Ingo Molnar <mingo@kernel.org>
> > Cc: Peter Zijlstra <peterz@infradead.org>
> > Cc: Vincent Guittot <vincent.guittot@linaro.org>
> > Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
> > Cc: Linus Torvalds <torvalds@linux-foundation.org>
> > Cc: Valentin Schneider <vschneid@redhat.com>
> > ---
> >  kernel/sched/fair.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> > index 934ace69eb30..4c46bffb6a7a 100644
> > --- a/kernel/sched/fair.c
> > +++ b/kernel/sched/fair.c
> > @@ -12410,14 +12410,14 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
> >
> >  /*
> >   * run_rebalance_domains is triggered when needed from the scheduler tick.
> > - * Also triggered for nohz idle balancing (with nohz_balancing_kick set).
> 
> I think it should be nohz_balancer_kick() instead of nohz_balancing_kick
> 
> 
> > + * Also triggered for NOHZ idle balancing (with NOHZ_BALANCE_KICK set).
> 
> In fact, this can be triggered even without NOHZ_BALANCE_KICK. Any of
> the below can trigger this
>   - NOHZ_BALANCE_KICK
>   - NOHZ_STATS_KICK
>   - NOHZ_NEXT_KICK

Yeah, indeed any of the flags in NOHZ_KICK_MASK can trigger nohz_csd and 
indirect the balancing softirq - so I changed the text to:

  /*                      
   * This softirq may be triggered from the scheduler tick, or by
   * any of the flags in NOHZ_KICK_MASK: NOHZ_BALANCE_KICK,
   * NOHZ_STATS_KICK or NOHZ_NEXT_KICK.
   */
  static __latent_entropy void run_rebalance_domains(struct softirq_action *h)

Thanks,

	Ingo

On 04/03/24 10:48, Ingo Molnar wrote:
> Fix two typos:
>
>  - There's no such thing as 'nohz_balancing_kick', the
>    flag is named 'BALANCE' and is capitalized:  NOHZ_BALANCE_KICK.
>
>  - Likewise there's no such thing as a 'pending nohz_balance_kick'
>    either, the NOHZ_BALANCE_KICK flag is all upper-case.
>
> Signed-off-by: Ingo Molnar <mingo@kernel.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Vincent Guittot <vincent.guittot@linaro.org>
> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Valentin Schneider <vschneid@redhat.com>

Reviewed-by: Valentin Schneider <vschneid@redhat.com>