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

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Date:	Thu, 3 May 2007 18:15:06 +0200
From:	"Michal Piotrowski" <michal.k.k.piotrowski@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	"Con Kolivas" <kernel@...ivas.org>
Subject: Re: swap-prefetch: 2.6.22 -mm merge plans

Hi,

On 03/05/07, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> > - If replying, please be sure to cc the appropriate individuals.
> >   Please also consider rewriting the Subject: to something
> >   appropriate.
>
> i'm wondering about swap-prefetch:
>
>   mm-implement-swap-prefetching.patch
>   swap-prefetch-avoid-repeating-entry.patch
>   add-__gfp_movable-for-callers-to-flag-allocations-from-high-memory-that-may-be-migrated-swap-prefetch.patch
>
> The swap-prefetch feature is relatively compact:
>
>    10 files changed, 745 insertions(+), 1 deletion(-)
>
> it is contained mostly to itself:
>
>    mm/swap_prefetch.c            |  581 ++++++++++++++++++++++++++++++++
>
> i've reviewed it once again and in the !CONFIG_SWAP_PREFETCH case it's a
> clear NOP, while in the CONFIG_SWAP_PREFETCH=y case all the feedback
> i've seen so far was positive. Time to have this upstream and time for a
> desktop-oriented distro to pick it up.
>
> I think this has been held back way too long. It's .config selectable
> and it is as ready for integration as it ever is going to be. So it's a
> win/win scenario.

I'm using SWAP_PREFETCH since 2.6.17-mm1 (I don't have earlier configs)
http://www.stardust.webpages.pl/files/tbf/euridica/2.6.17-mm1/mm-config
and I don't recall _any_ problems. It's very stable for me.

>
> Acked-by: Ingo Molnar <mingo@...e.hu>
>
>         Ingo

Regards,
Michal

-- 
Michal K. K. Piotrowski
Kernel Monkeys
(http://kernel.wikidot.com/start)
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