From: Ingo Molnar <mingo@kernel.org>
To: Frederic Weisbecker <frederic@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
Jacek Anaszewski <jacek.anaszewski@gmail.com>,
Wanpeng Li <wanpengli@tencent.com>,
"Rafael J . Wysocki" <rjw@rjwysocki.net>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Rik van Riel <riel@surriel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Yauheni Kaliuta <yauheni.kaliuta@redhat.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Pavel Machek <pavel@ucw.cz>
Subject: Re: [PATCH 5/6] leds: Use all-in-one vtime aware kcpustat accessor
Date: Thu, 21 Nov 2019 17:49:58 +0100 [thread overview]
Message-ID: <20191121164958.GA46146@gmail.com> (raw)
In-Reply-To: <20191121141410.GA17301@lenoir>
* Frederic Weisbecker <frederic@kernel.org> wrote:
> On Thu, Nov 21, 2019 at 07:58:26AM +0100, Ingo Molnar wrote:
> >
> > * Frederic Weisbecker <frederic@kernel.org> wrote:
> >
> > > We can now safely read user kcpustat fields on nohz_full CPUs.
> > > Use the appropriate accessor.
> > >
> > > Reported-by: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
> > > Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
> > > Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com>
> > > Cc: Pavel Machek <pavel@ucw.cz>
> > > Cc: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
> > > Cc: Thomas Gleixner <tglx@linutronix.de>
> > > Cc: Rik van Riel <riel@surriel.com>
> > > Cc: Peter Zijlstra <peterz@infradead.org>
> > > Cc: Wanpeng Li <wanpengli@tencent.com>
> > > Cc: Ingo Molnar <mingo@kernel.org>
> > > ---
> > > drivers/leds/trigger/ledtrig-activity.c | 14 +++++++++-----
> > > 1 file changed, 9 insertions(+), 5 deletions(-)
> > >
> > > diff --git a/drivers/leds/trigger/ledtrig-activity.c b/drivers/leds/trigger/ledtrig-activity.c
> > > index ddfc5edd07c8..6901e3631c22 100644
> > > --- a/drivers/leds/trigger/ledtrig-activity.c
> > > +++ b/drivers/leds/trigger/ledtrig-activity.c
> > > @@ -57,11 +57,15 @@ static void led_activity_function(struct timer_list *t)
> > > curr_used = 0;
> > >
> > > for_each_possible_cpu(i) {
> > > - curr_used += kcpustat_cpu(i).cpustat[CPUTIME_USER]
> > > - + kcpustat_cpu(i).cpustat[CPUTIME_NICE]
> > > - + kcpustat_field(&kcpustat_cpu(i), CPUTIME_SYSTEM, i)
> > > - + kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]
> > > - + kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
> > > + struct kernel_cpustat kcpustat;
> > > +
> > > + kcpustat_fetch_cpu(&kcpustat, i);
> > > +
> > > + curr_used += kcpustat.cpustat[CPUTIME_USER]
> > > + + kcpustat.cpustat[CPUTIME_NICE]
> > > + + kcpustat.cpustat[CPUTIME_SYSTEM]
> > > + + kcpustat.cpustat[CPUTIME_SOFTIRQ]
> > > + + kcpustat.cpustat[CPUTIME_IRQ];
> >
> > Not the best tested series:
> >
> > --- a/drivers/leds/trigger/ledtrig-activity.c
> > +++ b/drivers/leds/trigger/ledtrig-activity.c
> > @@ -59,7 +59,7 @@ static void led_activity_function(struct timer_list *t)
> > for_each_possible_cpu(i) {
> > struct kernel_cpustat kcpustat;
> >
> > - kcpustat_fetch_cpu(&kcpustat, i);
> > + kcpustat_cpu_fetch(&kcpustat, i);
> >
> > curr_used += kcpustat.cpustat[CPUTIME_USER]
> > + kcpustat.cpustat[CPUTIME_NICE]
> >
> >
> > :-)
>
> Oops, I tested with vtime on and off but that one slipped under my config.
> Do you want me to resend?
No need, I suspect this slipped in via my last minute request for that
interface cleanup - so I just applied the fix and tested it - it all
passed testing today and I just pushed it out into tip:sched/core.
So all's good so far.
Thanks Frederic!
Ingo
next prev parent reply other threads:[~2019-11-21 16:50 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-21 2:44 [PATCH 0/6] sched/nohz: Make the rest of kcpustat vtime aware v3 Frederic Weisbecker
2019-11-21 2:44 ` [PATCH 1/6] sched/cputime: Support other fields on kcpustat_field() Frederic Weisbecker
2019-11-21 16:48 ` [tip: sched/core] " tip-bot2 for Frederic Weisbecker
2019-11-21 2:44 ` [PATCH 2/6] sched/vtime: Bring up complete kcpustat accessor Frederic Weisbecker
2019-11-21 16:48 ` [tip: sched/core] " tip-bot2 for Frederic Weisbecker
2019-12-28 20:56 ` [PATCH 2/6] " Chris Wilson
2019-12-30 1:08 ` Frederic Weisbecker
2019-12-30 9:04 ` [PATCH] sched/vtime: Prevent unstable evaluation of WARN(vtime->state) Chris Wilson
2019-12-30 17:39 ` Frederic Weisbecker
2019-11-21 2:44 ` [PATCH 3/6] procfs: Use all-in-one vtime aware kcpustat accessor Frederic Weisbecker
2019-11-21 16:48 ` [tip: sched/core] " tip-bot2 for Frederic Weisbecker
2019-12-08 15:57 ` [PATCH 3/6] " Paul Orlyk
2019-12-09 15:50 ` Frederic Weisbecker
2019-11-21 2:44 ` [PATCH 4/6] cpufreq: Use vtime aware kcpustat accessors for user time Frederic Weisbecker
2019-11-21 16:48 ` [tip: sched/core] " tip-bot2 for Frederic Weisbecker
2019-11-21 2:44 ` [PATCH 5/6] leds: Use all-in-one vtime aware kcpustat accessor Frederic Weisbecker
2019-11-21 6:58 ` Ingo Molnar
2019-11-21 14:14 ` Frederic Weisbecker
2019-11-21 16:49 ` Ingo Molnar [this message]
2019-11-21 16:48 ` [tip: sched/core] " tip-bot2 for Frederic Weisbecker
2019-11-21 2:44 ` [PATCH 6/6] rackmeter: Use " Frederic Weisbecker
2019-11-21 16:48 ` [tip: sched/core] " tip-bot2 for Frederic Weisbecker
-- strict thread matches above, loose matches on Subject: below --
2019-11-19 23:22 [PATCH 0/6] sched/nohz: Make the rest of kcpustat vtime aware v2 Frederic Weisbecker
2019-11-19 23:22 ` [PATCH 5/6] leds: Use all-in-one vtime aware kcpustat accessor Frederic Weisbecker
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