From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rafael J. Wysocki" Subject: Re: question on freeze and aio Date: Fri, 9 Feb 2007 23:09:11 +0100 Message-ID: <200702092309.11530.rjw@sisk.pl> References: Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: Content-Disposition: inline List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-pm-bounces@lists.osdl.org Errors-To: linux-pm-bounces@lists.osdl.org To: linux-pm@lists.osdl.org List-Id: linux-pm@vger.kernel.org On Friday, 9 February 2007 23:03, Alan Stern wrote: > On Sat, 10 Feb 2007, Nigel Cunningham wrote: > = > > Hi. > > = > > On Fri, 2007-02-09 at 17:04 +0100, Oliver Neukum wrote: > > > Hi, > > > = > > > can there be running aio requests if all tasks are frozen? > > = > > Since tasks are frozen, no new aio requests would be submitted. We do a > > sync to ssek to complete existing requests; I haven't looked to see > > whether that would need extending to flush aio as well, but don't think > > that would be the case. Given everyone else's silence, so far, you might > > be better to ask the author(s) of the aio code. > = > I believe Nigel is basically correct. However sync will only flush aio = > for block devices. Other types of aio will remain active. > = > aio callbacks are interrupt-driven and execute in a workqueue (see > fs/aio.c), and as far as I can tell that workqueue doesn't freeze. = > Unless some general facility freezes all workqueues... No, workqueues are not frozen unless they are explicitly declared as freezeable. Which currently is only done by XFS, AFAIKS. Greetings, Rafael -- = If you don't have the time to read, you don't have the time or the tools to write. - Stephen King