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SubjectRe: [PATCH] proc/schedstat: Expose /proc/<pid>/schedstat if delay accounting is enabled
On 2015/05/29 11:18AM, Ingo Molnar wrote:
>
> * Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> wrote:
>
> > On 2015/05/29 10:04AM, Ingo Molnar wrote:
> > >
> > > * Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> wrote:
> > >
> > > - The sum_exec_runtime field is available unconditionally.
> > >
> > > - But the sched_info.run_delay field is only maintained if CONFIG_SCHEDSTATS is
> > > enabled.
> > >
> > > - Also, the sched_info.pcount field is again only maintained if CONFIG_SCHEDSTATS
> > > is enabled.
> >
> > I may be missing something, but from my reading of the code, the above
> > are maintained if any one of CONFIG_SCHEDSTATS or CONFIG_TASK_DELAY_ACCT
> > are enabled (from kernel/sched/stats.h).
>
> Hm, indeed - I mis-read the rq-specific code - sorry.
>
> So all this should really be cleaned up:
>
> include/linux/sched.h:#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
> include/linux/sched.h:#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
> include/linux/sched.h:#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
> kernel/sched/core.c:#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
> kernel/sched/stats.h:#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
> kernel/sched/stats.h:#endif /* CONFIG_SCHEDSTATS || CONFIG_TASK_DELAY_ACCT */
>
> by introducing an intermediate Kconfig variable, named CONFIG_SCHED_INFO or so,
> and selected by both SCHEDSTATS and TASK_DELAY_ACCT.
>
> Please make it two patches: the first one adds CONFIG_SCHED_INFO and cleans up the
> code to use it, the second one uses it for the procps change.

Sure, will do.

On a related note, even though sum_exec_runtime is available
unconditionally, I dump all zeroes in my patch if !sched_info_on() to
make it clear that some of the fields are not available. Is this ok or
should be display sum_exec_runtime regardless of sched_info?

Thanks,
Naveen



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