linux-kernel - Re: [PATCH] [13/16] HWPOISON: The high level memory error handler in the VM v3

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 9 Jun 2009 12:48:25 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Nai Xia <nai.xia@...il.com>, Andi Kleen <andi@...stfloor.org>,
	"hugh@...itas.com" <hugh@...itas.com>,
	"riel@...hat.com" <riel@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] [13/16] HWPOISON: The high level memory error handler in  the VM v3

On Tue, Jun 09, 2009 at 02:48:55PM +0800, Wu Fengguang wrote:
> On Mon, Jun 08, 2009 at 10:46:53PM +0800, Nai Xia wrote:
> > I meant PG_writeback stops writers to index---->struct page mapping.
> 
> It's protected by the radix tree RCU locks. Period.
> 
> If you are referring to the reverse mapping: page->mapping is procted
> by PG_lock. No one should make assumption that it won't change under
> page writeback.

Well... I think probably PG_writeback should be enough. Phrased another
way: I think it is a very bad idea to truncate PG_writeback pages out of
pagecache. Does anything actually do that?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/