From: Christoph Lameter <clameter@sgi.com>
To: Paul Menage <menage@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
linux-mm@kvack.org, akpm@osdl.org
Subject: Re: [RFC][PATCH 0/1] Node-based reclaim/migration
Date: Thu, 30 Nov 2006 11:42:20 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0611301139420.24215@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <6599ad830611301109n8c4637ei338ecb4395c3702b@mail.gmail.com>
On Thu, 30 Nov 2006, Paul Menage wrote:
> On 11/30/06, Christoph Lameter <clameter@sgi.com> wrote:
> >
> > F.e. A page cache page may have mapcount == 0.
>
> OK, I was thinking just about anon pages.
>
> For pagecache pages, it's safe to access the mapping as long as we've
> locked the page, even if mapcount is 0? So we don't have the same
> races?
We have no problem with the page lock (you actually may not need any
locking since there are no references remaining to the page). The trouble
is that the vma may have vanished when we try to reestablish the pte.
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next prev parent reply other threads:[~2006-11-30 19:42 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-29 3:06 menage
2006-11-29 3:06 ` [RFC][PATCH 1/1] Expose per-node reclaim and migration to userspace menage
2006-11-29 6:07 ` Nick Piggin
2006-11-29 21:57 ` Paul Menage
2006-11-30 4:13 ` Christoph Lameter
2006-11-30 4:18 ` Paul Menage
2006-11-30 7:38 ` Nick Piggin
2006-11-30 7:57 ` Paul Menage
2006-11-30 8:26 ` Nick Piggin
2006-11-30 8:39 ` Paul Menage
2006-11-30 8:55 ` Nick Piggin
2006-11-30 9:06 ` Paul Menage
2006-11-30 9:21 ` Nick Piggin
2006-11-30 9:45 ` Paul Menage
2006-11-30 10:15 ` Nick Piggin
2006-11-30 10:40 ` Paul Menage
2006-11-30 11:04 ` Nick Piggin
2006-11-30 11:23 ` Paul Menage
2006-11-30 11:35 ` Nick Piggin
2006-11-30 0:18 ` KAMEZAWA Hiroyuki
2006-11-30 0:25 ` Paul Menage
2006-11-30 0:38 ` KAMEZAWA Hiroyuki
2006-11-30 4:15 ` Christoph Lameter
2006-11-30 4:10 ` Christoph Lameter
2006-11-30 0:31 ` [RFC][PATCH 0/1] Node-based reclaim/migration KAMEZAWA Hiroyuki
2006-11-30 0:31 ` Paul Menage
2006-11-30 4:11 ` KAMEZAWA Hiroyuki
2006-11-30 4:17 ` Christoph Lameter
2006-11-30 10:45 ` Paul Menage
2006-11-30 11:12 ` KAMEZAWA Hiroyuki
2006-11-30 11:25 ` Paul Menage
2006-11-30 12:18 ` KAMEZAWA Hiroyuki
2006-11-30 18:28 ` Christoph Lameter
2006-11-30 18:35 ` Paul Menage
2006-11-30 18:39 ` Christoph Lameter
2006-11-30 19:09 ` Paul Menage
2006-11-30 19:42 ` Christoph Lameter [this message]
2006-11-30 19:53 ` Paul Menage
2006-11-30 20:00 ` Christoph Lameter
2006-11-30 20:07 ` Paul Menage
2006-11-30 20:15 ` Christoph Lameter
2006-11-30 21:33 ` Paul Menage
2006-11-30 23:41 ` Christoph Lameter
2006-11-30 23:48 ` Paul Menage
2006-12-01 2:23 ` Christoph Lameter
2006-12-01 19:32 ` Paul Menage
2006-12-01 19:56 ` Christoph Lameter
2006-12-01 2:44 ` KAMEZAWA Hiroyuki
2006-12-01 2:43 ` Christoph Lameter
2006-12-01 2:59 ` KAMEZAWA Hiroyuki
2006-12-01 2:44 ` Christoph Lameter
2006-12-01 3:10 ` KAMEZAWA Hiroyuki
2006-12-01 5:28 ` Christoph Lameter
2006-11-30 4:04 ` Christoph Lameter
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