From: Daniel Phillips <phillips@arcor.de>
To: "Martin J. Bligh" <mbligh@aracnet.com>, Mel Gorman <mel@csn.ul.ie>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC] My research agenda for 2.7
Date: Fri, 27 Jun 2003 17:17:01 +0200 [thread overview]
Message-ID: <200306271717.01562.phillips@arcor.de> (raw)
In-Reply-To: <25700000.1056726277@[10.10.2.4]>
On Friday 27 June 2003 17:04, Martin J. Bligh wrote:
> Daniel Phillips <phillips@arcor.de> wrote (on Friday, June 27, 2003
> > Some allocation strategies may be statistically more
> > resistiant to fragmentation than others, but no allocator has been
> > invented, or ever will be, that can guarantee that terminal fragmentation
> > will never occur - only active defragmentation can provide such a
> > guarantee.
>
> Whilst I agree with that in principle, it's inevitably expensive. Thus
> whilst we may need to have that code, we should try to avoid using it ;-)
That's exactly the idea. Active defragmentation is just a fallback to handle
currently-unhandled corner cases. A good, efficient allocator that resists
fragmentation in the first place is still needed.
Regards,
Daniel
WARNING: multiple messages have this Message-ID (diff)
From: Daniel Phillips <phillips@arcor.de>
To: "Martin J. Bligh" <mbligh@aracnet.com>, Mel Gorman <mel@csn.ul.ie>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC] My research agenda for 2.7
Date: Fri, 27 Jun 2003 17:17:01 +0200 [thread overview]
Message-ID: <200306271717.01562.phillips@arcor.de> (raw)
In-Reply-To: <25700000.1056726277@[10.10.2.4]>
On Friday 27 June 2003 17:04, Martin J. Bligh wrote:
> Daniel Phillips <phillips@arcor.de> wrote (on Friday, June 27, 2003
> > Some allocation strategies may be statistically more
> > resistiant to fragmentation than others, but no allocator has been
> > invented, or ever will be, that can guarantee that terminal fragmentation
> > will never occur - only active defragmentation can provide such a
> > guarantee.
>
> Whilst I agree with that in principle, it's inevitably expensive. Thus
> whilst we may need to have that code, we should try to avoid using it ;-)
That's exactly the idea. Active defragmentation is just a fallback to handle
currently-unhandled corner cases. A good, efficient allocator that resists
fragmentation in the first place is still needed.
Regards,
Daniel
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next prev parent reply other threads:[~2003-06-27 15:05 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-24 23:11 [RFC] My research agenda for 2.7 Daniel Phillips
2003-06-25 0:47 ` William Lee Irwin III
2003-06-25 1:07 ` Daniel Phillips
2003-06-25 1:10 ` William Lee Irwin III
2003-06-25 1:25 ` Daniel Phillips
2003-06-25 1:30 ` William Lee Irwin III
2003-06-25 9:29 ` Mel Gorman
2003-06-26 19:00 ` Daniel Phillips
2003-06-26 19:00 ` Daniel Phillips
2003-06-26 20:01 ` Mel Gorman
2003-06-26 20:01 ` Mel Gorman
2003-06-26 20:10 ` Andrew Morton
2003-06-26 20:10 ` Andrew Morton
2003-06-27 0:30 ` Daniel Phillips
2003-06-27 0:30 ` Daniel Phillips
2003-06-27 13:00 ` Mel Gorman
2003-06-27 13:00 ` Mel Gorman
2003-06-27 14:38 ` Martin J. Bligh
2003-06-27 14:38 ` Martin J. Bligh
2003-06-27 14:41 ` Daniel Phillips
2003-06-27 14:41 ` Daniel Phillips
2003-06-27 14:43 ` Martin J. Bligh
2003-06-27 14:43 ` Martin J. Bligh
2003-06-27 14:54 ` Daniel Phillips
2003-06-27 14:54 ` Daniel Phillips
2003-06-27 15:04 ` Martin J. Bligh
2003-06-27 15:04 ` Martin J. Bligh
2003-06-27 15:17 ` Daniel Phillips [this message]
2003-06-27 15:17 ` Daniel Phillips
2003-06-27 15:22 ` Mel Gorman
2003-06-27 15:22 ` Mel Gorman
2003-06-27 15:50 ` Daniel Phillips
2003-06-27 15:50 ` Daniel Phillips
2003-06-27 16:00 ` Daniel Phillips
2003-06-27 16:00 ` Daniel Phillips
2003-06-29 19:25 ` Mel Gorman
2003-06-29 19:25 ` Mel Gorman
2003-06-28 21:06 ` Daniel Phillips
2003-06-28 21:06 ` Daniel Phillips
2003-06-29 21:26 ` Mel Gorman
2003-06-29 21:26 ` Mel Gorman
2003-06-28 21:54 ` Daniel Phillips
2003-06-28 21:54 ` Daniel Phillips
2003-06-29 22:07 ` William Lee Irwin III
2003-06-29 22:07 ` William Lee Irwin III
2003-06-28 23:18 ` Daniel Phillips
2003-06-28 23:18 ` Daniel Phillips
2003-07-02 21:10 ` Mike Fedyk
2003-07-02 21:10 ` Mike Fedyk
2003-07-03 2:04 ` Larry McVoy
2003-07-03 2:04 ` Larry McVoy
2003-07-03 2:20 ` William Lee Irwin III
2003-07-03 2:20 ` William Lee Irwin III
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