From: IWAMOTO Toshihiro <iwamoto@valinux.co.jp>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: Hirokazu Takahashi <taka@valinux.co.jp>,
haveblue@us.ibm.com, akpm@osdl.org, linux-mm@kvack.org,
piggin@cyberone.com.au, arjanv@redhat.com,
linux-kernel@vger.kernel.org
Subject: Re: [RFC] memory defragmentation to satisfy high order allocations
Date: Mon, 04 Oct 2004 13:09:10 +0900 [thread overview]
Message-ID: <20041004040910.DCE4470A2D@sv1.valinux.co.jp> (raw)
In-Reply-To: <20041002183349.GA7986@logos.cnet>
At Sat, 2 Oct 2004 15:33:49 -0300,
Marcelo Tosatti wrote:
>
> On Sat, Oct 02, 2004 at 06:30:15PM +0900, Hirokazu Takahashi wrote:
> 3) At migrate_page_common you assume additional page references
> (page_migratable returning -EAGAIN) means the code should try to writeout
> the page.
>
> Is that assumption always valid?
>
> In theory there is no need to writeout pages when migrating them to
> other zones - they will be copied and the dirty information retained (either
> in the PageDirty bit or radix tree tag).
It's true only when page->private is NULL. Otherwise writeback is
necessary to free buffer_head.
> I just noticed you do that on further patches (migrate_page_buffer), but AFAICS
> the writeout remains. Why arent you using migrate_page_buffer yet?
>
> I think the final aim should be to remove the need for "pageout()"
> completly.
Are you going to implement migrate_page_buffer for every file system?
I don't think it's worthwhile.
> Questions: are there any documents on the memory hotplug userspace tools?
> Where can I find them?
>
> Are Iwamoto's test programs available?
I've put them at the following URL, but I doubt they are useful for
you; there are no documentation for them.
http://people.valinux.co.jp/~iwamoto/mh/tests/
--
IWAMOTO Toshihiro
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"aart@kvack.org"> aart@kvack.org </a>
next prev parent reply other threads:[~2004-10-04 4:09 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
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 ` IWAMOTO Toshihiro [this message]
2004-10-04 17:29 ` [RFC] memory defragmentation to satisfy high order allocations 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20041004040910.DCE4470A2D@sv1.valinux.co.jp \
--to=iwamoto@valinux.co.jp \
--cc=akpm@osdl.org \
--cc=arjanv@redhat.com \
--cc=haveblue@us.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=marcelo.tosatti@cyclades.com \
--cc=piggin@cyberone.com.au \
--cc=taka@valinux.co.jp \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox