From: IWAMOTO Toshihiro <iwamoto@valinux.co.jp>
To: Dave Hansen <haveblue@us.ibm.com>
Cc: Ashwin Rao <ashwin_s_rao@yahoo.com>,
Valdis.Kletnieks@vt.edu,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>
Subject: Re: Atomic operation for physically moving a page (for memory defragmentation)
Date: Wed, 23 Jun 2004 18:04:01 +0900 [thread overview]
Message-ID: <20040623090401.09BFA70B63@sv1.valinux.co.jp> (raw)
In-Reply-To: <1087619137.4921.93.camel@nighthawk>
At Fri, 18 Jun 2004 21:25:38 -0700,
Dave Hansen wrote:
> I think what you really want to do is keep anybody else from making a
> new pte to the page, once you've invalidated all of the existing ones,
> right?
>
> Holding a lock_page() should do the trick. Anybody that goes any pulls
> the page out of the page cache has to do a lock_page() and check
> page->mapping before they can establish a pte to it, so you can stop
> that. Since you're invalidating page->mapping before you move the page
> (you *are* doing this, right?), it will end up working itself out.
This isn't true unless the PG_uptodate bit of the page isn't cleared,
and properly doing that isn't so simple.
I'm planning to post a new version of my memory hotplug patch,
but the page migration code currently doesn't work well with
linux-2.6.7.
--
IWAMOTO Toshihiro
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next prev parent reply other threads:[~2004-06-23 9:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-19 0:37 Atomic operation for physically moving a page Ashwin Rao
2004-06-19 1:03 ` Valdis.Kletnieks
2004-06-19 2:53 ` Dave Hansen
2004-06-19 3:15 ` Atomic operation for physically moving a page (for memory defragmentation) Ashwin Rao
2004-06-19 3:34 ` Valdis.Kletnieks
2004-06-19 4:25 ` Dave Hansen
2004-06-23 9:04 ` IWAMOTO Toshihiro [this message]
2004-06-23 11:59 ` Hirokazu Takahashi
2004-06-23 20:56 ` Dave Hansen
2004-06-24 7:19 ` IWAMOTO Toshihiro
2004-06-24 11:31 ` Dave Hansen
2004-06-23 10:32 ` Hirokazu Takahashi
2004-06-19 2:43 ` Atomic operation for physically moving a page Dave Hansen
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