From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f54.google.com (mail-pa0-f54.google.com [209.85.220.54]) by kanga.kvack.org (Postfix) with ESMTP id 06E386B0037 for ; Fri, 18 Jul 2014 06:47:19 -0400 (EDT) Received: by mail-pa0-f54.google.com with SMTP id fa1so5166899pad.27 for ; Fri, 18 Jul 2014 03:47:16 -0700 (PDT) Received: from userp1040.oracle.com (userp1040.oracle.com. [156.151.31.81]) by mx.google.com with ESMTPS id xi3si5493040pab.111.2014.07.18.03.47.15 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Fri, 18 Jul 2014 03:47:16 -0700 (PDT) Message-ID: <53C8FAA6.9050908@oracle.com> Date: Fri, 18 Jul 2014 06:44:54 -0400 From: Sasha Levin MIME-Version: 1.0 Subject: Re: [PATCH 0/2] shmem: fix faulting into a hole while it's punched, take 3 References: <53C7F55B.8030307@suse.cz> <53C7F5FF.7010006@oracle.com> In-Reply-To: <53C7F5FF.7010006@oracle.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Vlastimil Babka , Hugh Dickins , Andrew Morton Cc: Konstantin Khlebnikov , Johannes Weiner , Michel Lespinasse , Lukas Czerner , Dave Jones , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org On 07/17/2014 12:12 PM, Sasha Levin wrote: > On 07/17/2014 12:10 PM, Vlastimil Babka wrote: >> > On 07/15/2014 12:28 PM, Hugh Dickins wrote: >>> >> In the end I decided that we had better look at it as two problems, >>> >> the trinity faulting starvation, and the indefinite punching loop, >>> >> so 1/2 and 2/2 present both solutions: belt and braces. >> > >> > I tested that with my reproducer and it was OK, but as I already said, it's not trinity so I didn't observe the new problems in the first place. > I've started seeing a new hang in the lru code, but I'm not sure if > it's related to this patch or not (the locks are the same ones, but > the location is very different). > > I'm looking into that. Hi Hugh, The new hang I'm seeing is much simpler to analyse (compared to shmem_fallocate) and doesn't seem to be related. I'll send a separate mail and Cc you just in case, but I don't think that this patchset has anything to do with it. Otherwise, I've been unable to reproduce the shmem_fallocate hang. Thanks, Sasha -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org