linux-kernel - Re: workqueue thing

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Message-ID: <20091223075309.GF23839@elte.hu>
Date:	Wed, 23 Dec 2009 08:53:09 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>, awalls@...ix.net,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	jens.axboe@...cle.com, rusty@...tcorp.com.au,
	cl@...ux-foundation.org, dhowells@...hat.com,
	arjan@...ux.intel.com, avi@...hat.com, johannes@...solutions.net,
	andi@...stfloor.org
Subject: Re: workqueue thing


* Jeff Garzik <jeff@...zik.org> wrote:

> On 12/23/2009 01:02 AM, Ingo Molnar wrote:
> >One key thing i havent seen in this discussion are actual measurements. I
> >think a lot could be decided by simply testing this patch-set, by looking at
> >the hard numbers: how much faster (or slower) did a particular key workload
> >get before/after these patches.
> 
> We are dealing with situations where drivers are using workqueues to
> provide a sleep-able context, and trying to solve problems related
> to that.
> 
> "faster or slower?" is not very relevant for such cases.

Claims to performance were made though, so it's a valid question.

But it's not the only effect, which is why i continued my email with the issue 
you raised:

> > Likewise, if there's a reduction in complexity, that is a tangible metric 
> > as well: lets do a few conversions as part of the patch-set and see how 
> > much simpler things have become as a result of it.
> >
> > We really are not forced to the space of Gedankenexperiments here.

Thanks,

	Ingo
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