From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wg0-f48.google.com (mail-wg0-f48.google.com [74.125.82.48]) by kanga.kvack.org (Postfix) with ESMTP id 062866B0038 for ; Tue, 29 Jul 2014 03:56:52 -0400 (EDT) Received: by mail-wg0-f48.google.com with SMTP id x13so8339404wgg.7 for ; Tue, 29 Jul 2014 00:56:52 -0700 (PDT) Received: from casper.infradead.org (casper.infradead.org. [2001:770:15f::2]) by mx.google.com with ESMTPS id fw8si12289338wib.38.2014.07.29.00.56.51 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 29 Jul 2014 00:56:51 -0700 (PDT) Date: Tue, 29 Jul 2014 09:56:37 +0200 From: Peter Zijlstra Subject: Re: vmstat: On demand vmstat workers V8 Message-ID: <20140729075637.GA19379@twins.programming.kicks-ass.net> References: <53D31101.8000107@oracle.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="pEQDlUeuaD3XV+9x" Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Christoph Lameter Cc: Sasha Levin , akpm@linux-foundation.org, Gilad Ben-Yossef , Thomas Gleixner , Tejun Heo , John Stultz , Mike Frysinger , Minchan Kim , Hakan Akkan , Max Krasnyansky , Frederic Weisbecker , "Paul E. McKenney" , linux-kernel@vger.kernel.org, linux-mm@kvack.org, hughd@google.com, viresh.kumar@linaro.org, hpa@zytor.com, mingo@kernel.org --pEQDlUeuaD3XV+9x Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Jul 28, 2014 at 01:55:17PM -0500, Christoph Lameter wrote: > On Fri, 25 Jul 2014, Sasha Levin wrote: >=20 > > This patch doesn't interact well with my fuzzing setup. I'm seeing > > the following: > > > > [ 490.446927] BUG: using __this_cpu_read() in preemptible [00000000] c= ode: kworker/16:1/7368 > > [ 490.447909] caller is __this_cpu_preempt_check+0x13/0x20 >=20 > __this_cpu_read() from vmstat_update is only called from a kworker that > is bound to a single cpu. A false positive? kworkers are never guaranteed to be so, its a 'feature' :/ --pEQDlUeuaD3XV+9x Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJT11O1AAoJEHZH4aRLwOS61PUP/R/S+B40g7gd2IuLe4SbVCAs llPxoJDjdcT3bQyMf7kvUG8echjGZ+6EuQ7DcysUYwlE7Am8MsLH8zGaxNYN/ZIf gxKW0vP034O+7gD2igpXy27+/2WVQeZJvYoeDDo7lIAv4XFEdw35Ra+rqBHTdkmK ltfA40sYwAG5VSRhb3YEoglMYQ0reuIu+gUcpZAMqc3hCR4Dl9drPL1rnVhyCcEF 3Kn05qR/gB5ktZN1ju/YO74Vp8rDK3V9U7kt8mvX2SuhrLcsmWB76lbOQWoMv4Bc lHaRh8PyzN/zQcFzyfcxwBYRVUQHc+KHYQzedFsJY5nkOugDbiCSLBp2b3IEoVZo r+PWD5yRcWiuAR6v2b2TcvYGYJ1cuEpOTgbSQCPMcI6GglYCnqJa3mh/SP3BHIkw H0zKRnYuq9jr25kIgd928avmrceJmayA+qEOokstJD1Llt1QueZ/xF3kOcglL9L0 4FK5asoMJ28Hg62XUmMFDpRrdKIXuzi6D1qz6dMa9OTBf6BRjbuEk+Yx/ZxNA0xe +LltXPobiehCuJgnCqf5RPP2M8HpYk6sZ45vuzMeRRiQwCgb1H8AJxhmkkqxlYVd BGBVvMkZ679d9Wb5IEDFEYhvjE5YqqMrzYYQ3cpoBQiGm/kieCaBr9QqJVzmMfuY VoVdEp3ISffIyo4pyy6C =GQuK -----END PGP SIGNATURE----- --pEQDlUeuaD3XV+9x-- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org