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SubjectRe: [PATCH 5/6] leds: Use all-in-one vtime aware kcpustat accessor

* 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

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