Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758140Ab0FOSH6 (ORCPT ); Tue, 15 Jun 2010 14:07:58 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45465 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754665Ab0FOSH5 (ORCPT ); Tue, 15 Jun 2010 14:07:57 -0400 Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: References: <20100613194949.GC8055@thunk.org> <20100614184244.GA11480@elliptictech.com> <20100614214646.GF6666@thunk.org> To: Andy Whitcroft Cc: dhowells@redhat.com, tytso@mit.edu, Dave Airlie , Dave Airlie , linux-kernel@vger.kernel.org Subject: Re: Why is kslowd accumulating so much CPU time? Date: Tue, 15 Jun 2010 19:07:48 +0100 Message-ID: <18402.1276625268@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 972 Lines: 23 Andy Whitcroft wrote: > I am seeing crunchy cursor behavior on boot on Ubuntu Lucid user space > with the 2.6.35-rc3 kernel as well. It pretty much always does that > on boot, and often later as well. Right now I have four of these > chaps each consuming 9% of a CPU. Though they definatly come and go. > Very odd: > > 938 root 15 -5 0 0 0 S 9 0.0 1:00.90 kslowd001 > 1048 root 15 -5 0 0 0 S 9 0.0 1:01.12 kslowd002 > 937 root 15 -5 0 0 0 S 8 0.0 1:00.92 kslowd000 > 1544 root 15 -5 0 0 0 D 8 0.0 1:00.55 kslowd003 Can you see what they're doing? watch -n0 cat /sys/kernel/debug/slow_work/runqueue David -- 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/