linux-kernel - Re: swap-prefetch: 2.6.22 -mm merge plans

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Date:	Thu, 10 May 2007 13:56:49 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Ray Lee <ray-lk@...rabbit.org>
CC:	Con Kolivas <kernel@...ivas.org>, Ingo Molnar <mingo@...e.hu>,
	ck list <ck@....kolivas.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: swap-prefetch: 2.6.22 -mm merge plans

Ray Lee wrote:
> On 5/9/07, Nick Piggin <nickpiggin@...oo.com.au> wrote:
> 
>> You said it helped with the updatedb problem. That says we should look at
>> why it is going bad first, and for example improve use-once algorithms.
>> After we do that, then swap prefetching might still help, which is fine.
> 
> 
> Nick, if you're volunteering to do that analysis, then great. If not,
> then you're just providing a airy hope with nothing to back up when or
> if that work would ever occur.

I'd like to try helping. Tell me your problem.


> Further, if you or someone else *does* do that work, then guess what,
> we still have the option to rip out the swap prefetching code after
> the hypothetical use-once improvements have been proven and merged.
> Which, by the way, I've watched people talk about since 2.4. That was,
> y'know, a *while* ago.

What's wrong with the use-once we have? What improvements are you talking
about?


> So enough with the stop energy, okay? You're better than that.

I don't think it is about energy or being mean, I'm just stating the
issues I have with it.

-- 
SUSE Labs, Novell Inc.
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