Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261440AbUKOWlQ (ORCPT ); Mon, 15 Nov 2004 17:41:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261501AbUKOWjc (ORCPT ); Mon, 15 Nov 2004 17:39:32 -0500 Received: from fep18.inet.fi ([194.251.242.243]:58518 "EHLO fep18.inet.fi") by vger.kernel.org with ESMTP id S261440AbUKOWhM (ORCPT ); Mon, 15 Nov 2004 17:37:12 -0500 Date: Tue, 16 Nov 2004 00:37:09 +0200 From: Sami Farin <7atbggg02@sneakemail.com> To: linux-kernel Mailing List Subject: Re: vm-pageout-throttling.patch: hanging in throttle_vm_writeout/blk_congestion_wait Message-ID: <20041115223709.GD6654@m.safari.iki.fi> Mail-Followup-To: linux-kernel Mailing List References: <20041115012620.GA5750@m.safari.iki.fi> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.6i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1626 Lines: 37 On Mon, Nov 15, 2004 at 09:56:29PM +0000, Hugh Dickins wrote: > On Mon, 15 Nov 2004, Sami Farin wrote: > > > > this time I had some swapspace on /dev/loop1 (file-backed, reiserfs, > > loop-AES-2.2d)... I think (!) it caused this deadlock. > > That's not at all surprising. See the swap_extent work Andrew did > for 2.5 (in mm/swapfile.c), by which swap to a swapfile now avoids > the filesystem altogether (except while swapon prepares the map of > disk blocks). By swapping to a loop device over a file, you're > sneaking past his work, and putting the filesystem back under swap. Aha... interesting. > It is begging for deadlocks: I'm not saying it couldn't be got to > work, and of course it would be nice to boast that there's no such > issue; but there are so many better places to invest such effort... So, this was a known issue and it's hard to fix? I didn't know that. I know it's a "nicer" idea to use some partition for the swap instead of a file on reiserfs, but I created too small swap partitions originally and I can't(/bother?) resize the other partitions. And sometimes some memhog forces me to add even more swap. BTW. your MUA does not generate References: header field, it makes scoring hard... With References I would easily notice when someone writes a followup to some of the threads I have participated in. But I could patch my MUA... 8) -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/