From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Galbraith Subject: Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28 Date: Wed, 17 Sep 2008 20:16:11 +0200 Message-ID: <1221675371.5030.3.camel@marge.simson.net> References: <1221306287.5213.111.camel@marge.simson.net> <48CD1D25.9080301@linux-foundation.org> <1221421907.4597.24.camel@marge.simson.net> <1221475440.4784.39.camel@marge.simson.net> <1221568105.5020.17.camel@marge.simson.net> <1221626391.5043.13.camel@marge.simson.net> <1221627676.5125.3.camel@marge.simson.net> <20080917104044.GC18764@elte.hu> <1221651701.5102.17.camel@marge.simson.net> <20080917124943.GA7738@elte.hu> <1221657111.5511.14.camel@marge.simson.net> <48D11871.4090805@cosmosbay.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <48D11871.4090805-fPLkHRcR87vqlBn2x/YWAg@public.gmane.org> Sender: kernel-testers-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" To: Eric Dumazet Cc: Ingo Molnar , Ilpo =?ISO-8859-1?Q?J=E4rvinen?= , Christoph Lameter , "Rafael J. Wysocki" , LKML , kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org On Wed, 2008-09-17 at 16:47 +0200, Eric Dumazet wrote: > Could you please try following patch ? > > [PATCH] security_ops moved to read_mostly section > > "struct security_operations *security_ops" should be moved to read_mostly > section in order to NOT let it share a cache line with higly modified variables. v2.6.26-974-g2846693 (tip of revert reverts tree, == 847106f) 16384 87380 1 1 60.00 94350.45 16384 87380 1 1 60.01 95857.25 16384 87380 1 1 60.00 95334.84 16384 87380 1 1 60.00 95052.11 v2.6.26-659-g7804ad8 (first commit prior, == 2069f45) 16384 87380 1 1 60.00 98630.64 16384 87380 1 1 60.00 98653.14 16384 87380 1 1 60.00 99162.65 16384 87380 1 1 60.00 98652.38 v2.6.26-974-g2846693 patched 16384 87380 1 1 60.00 95877.41 16384 87380 1 1 60.00 95810.27 16384 87380 1 1 60.00 95530.03 16384 87380 1 1 60.00 94968.12 (poo, "it" didn't die)