From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f46.google.com (mail-pa0-f46.google.com [209.85.220.46]) by kanga.kvack.org (Postfix) with ESMTP id 8C5D982F64 for ; Wed, 28 Oct 2015 23:08:29 -0400 (EDT) Received: by padhy1 with SMTP id hy1so19829716pad.0 for ; Wed, 28 Oct 2015 20:08:29 -0700 (PDT) Received: from mail-pa0-x235.google.com (mail-pa0-x235.google.com. [2607:f8b0:400e:c03::235]) by mx.google.com with ESMTPS id yf8si74989710pbc.129.2015.10.28.20.08.28 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 28 Oct 2015 20:08:28 -0700 (PDT) Received: by pasz6 with SMTP id z6so25797847pas.2 for ; Wed, 28 Oct 2015 20:08:28 -0700 (PDT) Date: Thu, 29 Oct 2015 12:08:22 +0900 From: Tejun Heo Subject: Re: [patch 3/3] vmstat: Create our own workqueue Message-ID: <20151029030822.GD27115@mtj.duckdns.org> References: <20151028024114.370693277@linux.com> <20151028024131.719968999@linux.com> <20151028024350.GA10448@mtj.duckdns.org> <201510282057.JHI87536.OMOFFFLJOHQtVS@I-love.SAKURA.ne.jp> <20151029022447.GB27115@mtj.duckdns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151029022447.GB27115@mtj.duckdns.org> Sender: owner-linux-mm@kvack.org List-ID: To: Tetsuo Handa Cc: cl@linux.com, akpm@linux-foundation.org, mhocko@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, hannes@cmpxchg.org, mgorman@suse.de On Thu, Oct 29, 2015 at 11:24:47AM +0900, Tejun Heo wrote: > Hello, > > That's weird. > > On Wed, Oct 28, 2015 at 08:57:28PM +0900, Tetsuo Handa wrote: > > [ 272.851035] Showing busy workqueues and worker pools: > > [ 272.852583] workqueue events: flags=0x0 > > [ 272.853942] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=1/256 > > [ 272.855781] pending: vmw_fb_dirty_flush [vmwgfx] > > [ 272.857500] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 > > [ 272.859359] pending: vmpressure_work_fn > > [ 272.860840] workqueue events_freezable_power_: flags=0x84 > > [ 272.862461] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 > > [ 272.864479] in-flight: 11286:disk_events_workfn > > What's this guy doing? Can you get stack dump on 11286 (or whatever > is in flight in the next lockup)? Wait, this series doesn't include Tetsuo's change. Of course it won't fix the deadlock problem. What's necessary is Tetsuo's patch + WQ_MEM_RECLAIM. Thanks. -- tejun -- 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