RE: [linux-pm] [PATCH v4] PM: add statistics debugfs file forsuspend to ram

[Mansoor, Illyas]

> 
> > On Thu, Aug 11, 2011 at 01:22:56AM +0530, Mansoor, Illyas wrote:
> > > static pm_message_t pm_transition;
> > > > > >
> > > > > > @@ -464,8 +465,12 @@ void dpm_resume_noirq(pm_message_t state)
> > > > > >  		mutex_unlock(&dpm_list_mtx);
> > > > > >
> > > > > >  		error = device_resume_noirq(dev, state);
> > > > > > -		if (error)
> > > > > > +		if (error) {
> > > > > > +			suspend_stats.failed_resume_noirq++;
> > > > > > +			dpm_save_failed_step(SUSPEND_RESUME_NOIRQ);
> > > > > > +			dpm_save_failed_dev(dev_name(dev));
> > > > >
> > > > > Please make these statistics conditionally enabled, so on a production
> > system
> > > > > If we need to disable these statistics code we should be able to do so.
> > > >
> > > > Why, are they taking time or space that is needed for something else?
> > > > What's the downside here of just not always having this enabled?
> > >
> > > Why have something that is not required/Used?
> >
> > Because someone might need it and rebuilding a kernel isn't possible on
> > lots of devices.
> 
> Agreed.
> 
> >
> > > Its only useful if DEBUGFS is configured anyways
> >
> > Almost all systems these days have debugfs enabled, so that's a moot
> > point.
> 
> We could do the same for this as well, since DEBUGFS is still a compile time
> Option even thou many enable it by default we don't make it part of the kernel
> isn't it.
> 

May be it's not worth debating on this one, I'm okay if it's part of the kernel as well.

-Illyas
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