From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266603AbUGKO37 (ORCPT ); Sun, 11 Jul 2004 10:29:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266607AbUGKO37 (ORCPT ); Sun, 11 Jul 2004 10:29:59 -0400 Received: from mail014.syd.optusnet.com.au ([211.29.132.160]:1417 "EHLO mail014.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S266603AbUGKO3y (ORCPT ); Sun, 11 Jul 2004 10:29:54 -0400 Message-ID: <40F14ECB.909@kolivas.org> Date: Mon, 12 Jul 2004 00:29:31 +1000 From: Con Kolivas User-Agent: Mozilla Thunderbird 0.7.1 (X11/20040626) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Con Kolivas Cc: Ingo Molnar , ck kernel mailing list , Andrew Morton , Arjan van de Ven , linux-kernel@vger.kernel.org Subject: Re: [ck] Re: [announce] [patch] Voluntary Kernel Preemption Patch References: <20040709182638.GA11310@elte.hu> <20040709195105.GA4807@infradead.org> <20040710124814.GA27345@elte.hu> <40F0075C.2070607@kolivas.org> <40F016D9.8070300@kolivas.org> <20040711064730.GA11254@elte.hu> <40F14E53.2030300@kolivas.org> In-Reply-To: <40F14E53.2030300@kolivas.org> X-Enigmail-Version: 0.84.1.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig593A728307397E5EAC091219" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig593A728307397E5EAC091219 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Con Kolivas wrote: > Ingo Molnar wrote: > >> * Con Kolivas wrote: >> >> >>> Ooops forgot to mention this was running reiserFS 3.6 on software >>> raid0 2x IDE with cfq elevator. >> >> >> >> ok, reiserfs (and all journalling fs's) definitely need a look - as you >> can see from the ext3 mods in the patch. Any chance you could try ext3 >> based tests? Those are the closest to my setups. >> > > Ok I've done one better than that ;) I had wli help make some > instrumentation for me to help find the remaining non preemptible kernel > portions and set the cutoff to 2ms. Here is what I found: > > 7ms non-preemptible critical section violated 2 ms preempt threshold > starting at reiserfs_sync_fs+0x2d/0xc2 and ending at reiser > fs_lookup+0xe2/0x221 > > 9ms non-preemptible critical section violated 2 ms preempt threshold > starting at reiserfs_dirty_inode+0x37/0x10e and ending at r > eiserfs_dirty_inode+0xb0/0x10e > > > These seem to be the two offenders. Hope this helps. Oh and here are two different ones: 5ms non-preemptible critical section violated 2 ms preempt threshold starting at add_wait_queue+0x21/0x82 and ending at add_wait _queue+0x4a/0x82 3ms non-preemptible critical section violated 2 ms preempt threshold starting at exit_mmap+0x1c/0x188 and ending at exit_mmap+0x 118/0x188 Con --------------enig593A728307397E5EAC091219 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFA8U7LZUg7+tp6mRURAg99AKCTR8J5GbwIKIMLCife7/m38sgP/gCffEAE ISZaO/ZtxV0X8aHX5oKd4TM= =qSN7 -----END PGP SIGNATURE----- --------------enig593A728307397E5EAC091219--