Re: [PATCH 7/8] wbt: add general throttling mechanism

[Jens Axboe]

On 09/01/2016 12:05 PM, Omar Sandoval wrote:
> > diff --git a/lib/Kconfig b/lib/Kconfig
> > index d79909dc01ec..5a65a1f91889 100644
> > --- a/lib/Kconfig
> > +++ b/lib/Kconfig
> > @@ -550,4 +550,8 @@ config STACKDEPOT
> >  	bool
> >  	select STACKTRACE
> >
> > +config WBT
> > +	bool
> > +	select SCALE_BITMAP
>
> Looks like this snuck in from your experiments to get this to work on
> top of scale_bitmap?

Oops yes, it is indeed. Killed, thanks.

> > +	if (waitqueue_active(&rwb->wait)) {
> > +		int diff = limit - inflight;
> > +
> > +		if (!inflight || diff >= rwb->wb_background / 2)
> > +			wake_up_nr(&rwb->wait, 1);
>
> wake_up(&rwb->wait)?

Yeah, that'd be cleaner. I think this is a leftover from when I 
experimented with batched wakeups, with nr != 1. I'll change it to just 
wake_up().

--
Jens Axboe