From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751796Ab1AWKzz (ORCPT ); Sun, 23 Jan 2011 05:55:55 -0500 Received: from trent.utfs.org ([194.246.123.103]:52752 "EHLO trent.utfs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751351Ab1AWKzy (ORCPT ); Sun, 23 Jan 2011 05:55:54 -0500 X-Greylist: delayed 343 seconds by postgrey-1.27 at vger.kernel.org; Sun, 23 Jan 2011 05:55:54 EST Date: Sun, 23 Jan 2011 02:50:08 -0800 (PST) From: Christian Kujau To: Michael Witten cc: linux-kernel@vger.kernel.org Subject: Re: 'autogroup' sched code KILLING responsiveness In-Reply-To: <4d39ce58.cc7e0e0a.5448.59e4@mx.google.com> Message-ID: References: <4d39ce58.cc7e0e0a.5448.59e4@mx.google.com> User-Agent: Alpine 2.01 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-AV-Checked: ClamAV using ClamSMTP (127.0.0.1) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 21 Jan 2011 at 10:20, Michael Witten wrote: > With that code in place, a resource-intensive activity (such as > compiling the Linux kernel) causes my computer to become > unresponsive for many seconds at a time; the entire screen > does not refresh, typed keys are dropped or are handled very > late, etc (even in Linux's plain virtual consoles). Unfortunately, I'd like to add a "me too". 2.6.38-rc1 behaves fine, but with CONFIG_SCHED_AUTOGROUP=y and doing I/O and CPU intensive work (git prune/git repack on a Linux git tree), system load goes up to ~13 and becomes unresponse for some time too. This even happens when I start the jobs with nice -n10. Without CONFIG_SCHED_AUTOGROUP enabled and doing the same work, systemload goes up to 1 or maybe 2. I'm on UP as well (PowerPC G4), disabling CONFIG_SCHED_AUTOGROUP helps here too. Thanks, Christian. -- BOFH excuse #274: It was OK before you touched it.