From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: IWAMOTO Toshihiro <iwamoto@valinux.co.jp>,
Hirokazu Takahashi <taka@valinux.co.jp>,
haveblue@us.ibm.com, linux-mm@kvack.org
Subject: Re: [RFC] memory defragmentation to satisfy high order allocations
Date: Tue, 12 Oct 2004 09:17:49 -0300 [thread overview]
Message-ID: <20041012121749.GA10428@logos.cnet> (raw)
In-Reply-To: <1509480000.1097591191@[10.10.2.4]>
On Tue, Oct 12, 2004 at 07:26:32AM -0700, Martin J. Bligh wrote:
> >> > iwamoto> I don't think requiring swap is a big deal. If you don't have a
> >> > iwamoto> dedicated swap device, which case I think unusual, you can swapon a
> >> > iwamoto> regular file.
> >>
> >> Sure its not a big deal, but nicer if it doesnt require swap.
> >
> >> For memory defragmentation it is a big deal.
> >
> > Why? IMO, it isn't very rewarding to tune memory
> > migration/defragmentation performance as they involve memory copy
> > anyway.
> >
> > Or, do you want memory defragmentation everywhere, including embedded
> > systems?
>
> Lots of systems nowadays don't have swap configured, not just embedded.
> What do we gain from making defrag slower and harder to use, by forcing
> it to use swap? Isn't pushing it into the swapcache sufficient?
Hi Martin,
Yes pushing it to swapcache is sufficient - but doing so requires swap
map space (the "index" for swapcache pages is retrieved from swap map space
position).
As I posted in the other message I'm working on a idr-based cache (migration cache)
which should solve things.
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next prev parent reply other threads:[~2004-10-12 12:17 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-01 18:22 Marcelo Tosatti
2004-10-01 20:11 ` Andrew Morton
2004-10-01 19:04 ` Marcelo Tosatti
2004-10-01 21:00 ` Andrew Morton
2004-10-01 21:57 ` Dave Hansen
2004-10-01 23:42 ` Marcelo Tosatti
2004-10-02 1:17 ` Andrew Morton
2004-10-02 9:30 ` Hirokazu Takahashi
2004-10-02 18:33 ` Marcelo Tosatti
2004-10-03 4:13 ` Hirokazu Takahashi
2004-10-03 14:07 ` Marcelo Tosatti
2004-10-03 18:35 ` Hirokazu Takahashi
2004-10-03 19:21 ` Trond Myklebust
2004-10-03 20:03 ` Hirokazu Takahashi
2004-10-03 20:44 ` Trond Myklebust
2004-10-04 13:02 ` Hirokazu Takahashi
2004-10-04 17:24 ` Marcelo Tosatti
2004-10-05 2:53 ` Hirokazu Takahashi
2004-10-07 12:06 ` Marcelo Tosatti
2004-10-08 7:00 ` Hirokazu Takahashi
2004-10-08 10:00 ` Marcelo Tosatti
2004-10-08 12:23 ` Hirokazu Takahashi
2004-10-08 12:41 ` Marcelo Tosatti
2004-10-08 16:52 ` Hirokazu Takahashi
2004-10-08 15:36 ` Marcelo Tosatti
2004-10-12 10:56 ` IWAMOTO Toshihiro
2004-10-12 10:35 ` Marcelo Tosatti
2004-10-12 17:55 ` Hirokazu Takahashi
2004-10-12 14:26 ` Martin J. Bligh
2004-10-12 12:17 ` Marcelo Tosatti [this message]
2004-10-12 15:01 ` Dave Hansen
2004-10-04 3:24 ` IWAMOTO Toshihiro
2004-10-04 2:22 ` Dave Hansen
2004-10-05 16:46 ` [PATCH] mhp: transfer dirty tag at radix_tree_replace Marcelo Tosatti
2004-10-05 18:35 ` Dave Hansen
2004-10-06 7:39 ` Hirokazu Takahashi
2004-10-08 8:15 ` Hirokazu Takahashi
2004-10-08 20:36 ` Marcelo Tosatti
2004-10-04 4:09 ` [RFC] memory defragmentation to satisfy high order allocations IWAMOTO Toshihiro
2004-10-04 17:29 ` Marcelo Tosatti
2004-10-02 2:30 ` Nick Piggin
2004-10-02 3:08 ` Marcelo Tosatti
2004-10-04 8:15 ` Nick Piggin
2004-10-02 2:41 ` Nick Piggin
2004-10-02 3:50 ` Hirokazu Takahashi
2004-10-02 16:06 ` Marcelo Tosatti
2004-10-04 2:38 ` Hiroyuki KAMEZAWA
2004-10-04 17:32 ` Marcelo Tosatti
2004-10-04 6:58 ` Hiroyuki KAMEZAWA
2004-10-07 15:58 ` memory hotplug and mem= Marcelo Tosatti
2004-10-07 18:36 ` Dave Hansen
2004-10-07 17:01 ` Marcelo Tosatti
2004-10-07 19:10 ` Dave Hansen
2004-10-07 20:25 ` Dave Hansen
2004-10-11 16:40 [RFC] memory defragmentation to satisfy high order allocations linux
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