From mboxrd@z Thu Jan 1 00:00:00 1970 From: Phillip Susi Subject: Tracking down a workqueue io source Date: Wed, 25 Sep 2013 14:53:07 -0400 Message-ID: <52433113.1000806@ubuntu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120]:37472 "EHLO cdptpa-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750855Ab3IYSxM (ORCPT ); Wed, 25 Sep 2013 14:53:12 -0400 Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Linux Kernel Mailing List , linux-ide@vger.kernel.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I worked up some patches to use the ata SLEEP command instead of STANDBY to save more power, but I have found that something in the kernel keeps issuing a request to the disk ( no mounted filesystems on it ) every 10 minutes. This request resets the link bringing the disk back up to STANDBY mode. blktrace shows the process name is "pool" so I guess it is a work queue item? Inserting a dump_stack() was not helpful. How can I track down the source of this request? -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJSQzETAAoJEJrBOlT6nu75Pu0IAMOSNFLbklwCjmVMFZjuQk2x zrc6xOfPPmPsFqHUPG1TaoSUgzGJXsbZLUeaVFV2ZEIOFJPVl8Vn4Izkzyemk9dp xtgbtECLMCMZujpqGpL6UwBwBepUfDvoRSpdpcjZ28XByrXS1V8SrQtBw/4HtnDm Pkmf2MXxlqGDhAxCCuKHfnvjlP2pjfEt8teFH9Vsj4znMJw4BUC8IOepDATwbGd3 WEEv5kqmN27K7ZiEE3zo3jaQMlUtWrJwdyU+1zwvvdTpos/USdem9P4n80s5+CYm S7e0awRKOjleEZnozyNU9VO5tLViuKyp2096/6+gvna7MIE/Mgj7aWI/S4+A28c= =f2IA -----END PGP SIGNATURE-----