Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753803Ab2FZU45 (ORCPT ); Tue, 26 Jun 2012 16:56:57 -0400 Received: from mail-pz0-f46.google.com ([209.85.210.46]:57493 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751036Ab2FZU44 (ORCPT ); Tue, 26 Jun 2012 16:56:56 -0400 Date: Tue, 26 Jun 2012 13:56:51 -0700 From: Tejun Heo To: Josh Hunt Cc: Vivek Goyal , Jens Axboe , linux-kernel@vger.kernel.org Subject: Re: multi-second application stall in open() Message-ID: <20120626205651.GW3869@google.com> References: <20120625133047.GA9394@redhat.com> <20120625211850.GC10916@redhat.com> <20120626125953.GA22557@redhat.com> <20120626155332.GJ22557@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 979 Lines: 27 Hey, On Tue, Jun 26, 2012 at 03:37:31PM -0500, Josh Hunt wrote: > The print "cfq schedule dispatch: busy_queues:1 rq_queued:1 > rq_in_driver:0 rq_in_flight[0]:0 [1]:0" is inside the if to call > kblockd_schedule_work() so it is getting called, but you can see that > we never see the workqueue_queue_work tracepoint being hit. Hmm... looks like the work item is already queued. Can you please move the "schedule dispatch" message after kblockd_schedule_work() and print its return value too? > Tejun - if you could let me know what other data I should be looking > for/need to enable in the traces I would appreciate it. The trace seems truncated and doesn't contain 9527.XXXX traces. Can you please resend? Thanks. -- tejun -- 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/