From: IWAMOTO Toshihiro <iwamoto@valinux.co.jp>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: Hirokazu Takahashi <taka@valinux.co.jp>,
iwamoto@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 19:56:57 +0900 [thread overview]
Message-ID: <20041012105657.D1D0670463@sv1.valinux.co.jp> (raw)
In-Reply-To: <20041008153646.GJ16028@logos.cnet>
At Fri, 8 Oct 2004 12:36:46 -0300,
Marcelo Tosatti wrote:
>
> On Sat, Oct 09, 2004 at 01:52:39AM +0900, Hirokazu Takahashi wrote:
> > Hi, Marcelo.
> >
> > > > > > > That is, if we can't migrate the page, try to write it out?
> > > > >
> > > > > I just didnt understand the logic very well, maybe I should just
> > > > > go reread the code.
> > > > >
> > > > > Thanks!
> > >
> > > I'm thinking about how to implement a nonblocking version of generic_migrate_page().
> > >
> > > For this purpose its really bad to allocate swap space to anonymous pages, well
> > > need to figure out someother way of blocking the users via pagetablefault.
> > >
> > > Like a "virtual" swap space but without allocating swap map space.
> >
> > I've also ever thought to implement such a device.
> > It would be nice if you can design it simple.
> >
> > Mr.Iwamoto thought otherwise and posted another opinion on the lhms
> > list, though. I felt it also has a point.
> >
> > 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?
--
IWAMOTO Toshihiro
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next prev parent reply other threads:[~2004-10-12 10:56 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 [this message]
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
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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