From: Ingo Molnar <mingo@kernel.org>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: linux-kernel@vger.kernel.org,
Shrikanth Hegde <sshegde@linux.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Valentin Schneider <vschneid@redhat.com>
Subject: Re: [PATCH 5/9] sched/balancing: Fix comments (trying to) refer to NOHZ_BALANCE_KICK
Date: Fri, 8 Mar 2024 11:11:51 +0100 [thread overview]
Message-ID: <ZerkZ/4wpjLrYtvD@gmail.com> (raw)
In-Reply-To: <CAKfTPtCNmnsLL+OwyYjn+DysbXUyjqAdsWXr1Q6pGBybdkhYGw@mail.gmail.com>
* 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
next prev parent reply other threads:[~2024-03-08 10:11 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-04 9:48 [PATCH -v3 0/9] sched/balancing: Misc updates & cleanups Ingo Molnar
2024-03-04 9:48 ` [PATCH 1/9] sched/balancing: Switch the 'DEFINE_SPINLOCK(balancing)' spinlock into an 'atomic_t sched_balance_running' flag Ingo Molnar
2024-03-05 10:50 ` Valentin Schneider
2024-03-08 9:48 ` Ingo Molnar
2024-03-05 11:11 ` Shrikanth Hegde
2024-03-08 11:23 ` Ingo Molnar
2024-03-08 14:48 ` Shrikanth Hegde
2024-03-12 10:57 ` Ingo Molnar
2024-03-21 12:12 ` Shrikanth Hegde
2024-03-04 9:48 ` [PATCH 2/9] sched/balancing: Remove reliance on 'enum cpu_idle_type' ordering when iterating [CPU_MAX_IDLE_TYPES] arrays in show_schedstat() Ingo Molnar
2024-03-04 15:05 ` Shrikanth Hegde
2024-03-08 9:55 ` Ingo Molnar
2024-03-04 9:48 ` [PATCH 3/9] sched/balancing: Change 'enum cpu_idle_type' to have more natural definitions Ingo Molnar
2024-03-05 10:50 ` Valentin Schneider
2024-03-06 15:46 ` Vincent Guittot
2024-03-08 9:59 ` Ingo Molnar
2024-03-04 9:48 ` [PATCH 4/9] sched/balancing: Change comment formatting to not overlap Git conflict marker lines Ingo Molnar
2024-03-05 10:50 ` Valentin Schneider
2024-03-06 15:44 ` Vincent Guittot
2024-03-04 9:48 ` [PATCH 5/9] sched/balancing: Fix comments (trying to) refer to NOHZ_BALANCE_KICK Ingo Molnar
2024-03-05 10:50 ` Valentin Schneider
2024-03-06 15:43 ` Vincent Guittot
2024-03-08 10:11 ` Ingo Molnar [this message]
2024-03-04 9:48 ` [PATCH 6/9] sched/balancing: Update run_rebalance_domains() comments Ingo Molnar
2024-03-05 10:50 ` Valentin Schneider
2024-03-06 16:17 ` Vincent Guittot
2024-03-08 10:15 ` Ingo Molnar
2024-03-08 11:57 ` Vincent Guittot
2024-03-08 16:45 ` Valentin Schneider
2024-03-04 9:48 ` [PATCH 7/9] sched/balancing: Vertically align the comments of 'struct sg_lb_stats' and 'struct sd_lb_stats' Ingo Molnar
2024-03-05 10:50 ` Valentin Schneider
2024-03-04 9:48 ` [PATCH 8/9] sched/balancing: Update comments in " Ingo Molnar
2024-03-05 10:51 ` Valentin Schneider
2024-03-04 9:48 ` [PATCH 9/9] sched/balancing: Rename run_rebalance_domains() => sched_balance_softirq() Ingo Molnar
2024-03-05 10:51 ` Valentin Schneider
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