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SubjectRe: [PATCH 08/10] psi: pressure stall information for CPU, memory, and IO
On Tue, Jul 17, 2018 at 04:21:57PM +0200, Peter Zijlstra wrote:
> On Thu, Jul 12, 2018 at 01:29:40PM -0400, Johannes Weiner wrote:
> > diff --git a/include/linux/sched/stat.h b/include/linux/sched/stat.h
> > index 04f1321d14c4..ac39435d1521 100644
> > --- a/include/linux/sched/stat.h
> > +++ b/include/linux/sched/stat.h
> > @@ -28,10 +28,14 @@ static inline int sched_info_on(void)
> > return 1;
> > #elif defined(CONFIG_TASK_DELAY_ACCT)
> > extern int delayacct_on;
> > + if (delayacct_on)
> > + return 1;
> > +#elif defined(CONFIG_PSI)
> > + extern int psi_disabled;
> > + if (!psi_disabled)
> > + return 1;
> > #endif
> > + return 0;
> > }
>
> Doesn't that want to be something like:
>
> static inline bool sched_info_on(void)
> {
> #ifdef CONFIG_SCHEDSTAT
> return true;
> #else /* !SCHEDSTAT */
> #ifdef CONFIG_TASK_DELAY_ACCT
> extern int delayacct_on;
> if (delayacct_on)
> return true;
> #endif /* DELAYACCT */
> #ifdef CONFIG_PSI
> extern int psi_disabled;
> if (!psi_disabled)
> return true;
> #endif
> return false;
> #endif /* !SCHEDSTATE */
> }
>
> Such that if you build a TASK_DELAY_ACCT && PSI kernel, and boot with
> nodelayacct, you still get sched_info_on().

You're right, that was a brainfart on my end. But as you point out in
the other email, the SCHED_INFO dependency is artificial, so I'll
rework this entire part.

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