From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754270Ab3ADA0j (ORCPT ); Thu, 3 Jan 2013 19:26:39 -0500 Received: from dcvr.yhbt.net ([64.71.152.64]:53153 "EHLO dcvr.yhbt.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753773Ab3ADA0g (ORCPT ); Thu, 3 Jan 2013 19:26:36 -0500 Date: Fri, 4 Jan 2013 00:26:35 +0000 From: Eric Wong To: Eric Dumazet Cc: Mel Gorman , linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Rik van Riel , Minchan Kim , Andrew Morton , Linus Torvalds Subject: Re: ppoll() stuck on POLLIN while TCP peer is sending Message-ID: <20130104002635.GA6693@dcvr.yhbt.net> References: <20121228014503.GA5017@dcvr.yhbt.net> <20130102200848.GA4500@dcvr.yhbt.net> <20130102204712.GA17806@dcvr.yhbt.net> <1357220469.21409.24574.camel@edumazet-glaptop> <20130103183251.GA10113@dcvr.yhbt.net> <20130103234558.GA1689@dcvr.yhbt.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130103234558.GA1689@dcvr.yhbt.net> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Eric Wong wrote: > I think this requires frequent dirtying/cycling of pages to reproduce. > (from copying large files around) to interact with compaction. > I'll see if I can reproduce the issue with read-only FS activity. Still successfully running the read-only test on my main machine, will provide another update in a few hours or so if it's still successful (it usually takes <1 hour to hit). I also fired up a VM on my laptop (still running v3.7) and was able to get stuck with only 2 cores and 512M on the VM (x86_64). On the small VM with little disk space, it doesn't need much dirty data to trigger. I just did this: find $45G_NFS_MOUNT -type f -print0 | \ xargs -0 -n1 -P4 sh -c 'cat "$1" >> tmp; > tmp' -- ...while running two instances of toosleepy (one got stuck and aborted).