linux-kernel - Re: [RFC] [PATCH 2/4] dio: add page locking for direct I/O

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]

Message-ID: <20100817142144.GB18161@basil.fritz.box>
Date:	Tue, 17 Aug 2010 16:21:44 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Jun'ichi Nomura <j-nomura@...jp.nec.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [RFC] [PATCH 2/4] dio: add page locking for direct I/O

On Tue, Aug 17, 2010 at 09:46:56AM -0400, Jeff Moyer wrote:
> Naoya Horiguchi <n-horiguchi@...jp.nec.com> writes:
> 
> > BTW, from the discussion with Christoph I noticed my misunderstanding
> > about the necessity of additional page locking. It would seem that
> > without page locking there is no danger of racing between direct I/O and
> > page migration. So I retract this additional locking patch-set.
> 
> OK, great!  ;-)

Well it sounds like we still may need something. It isn't good if O_DIRECT
can starve (or DoS) migration.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
--
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/