From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754506Ab0ESHTG (ORCPT ); Wed, 19 May 2010 03:19:06 -0400 Received: from mail-ww0-f46.google.com ([74.125.82.46]:38322 "EHLO mail-ww0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753250Ab0ESHTC (ORCPT ); Wed, 19 May 2010 03:19:02 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=etU+PxR3NhzElx9YCX8b30EMKFjwYqlyP0aWcvmganS74RRMPj1awKU/z3o/M14bFA KWGTiMDCToXbKSAmhlrAPl3G0g/oW4YqrqQVC57mTb11DUI1U+7fe0fP6ODoE8/D1+Me 1nffaRIUOZdwwPw6TyIHxrbDGK8K+iNYUHDLY= Date: Wed, 19 May 2010 09:19:08 +0200 From: Frederic Weisbecker To: Peter Zijlstra Cc: Ingo Molnar , Paul Mackerras , Arnaldo Carvalho de Melo , Steven Rostedt , Thomas Gleixner , linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/5] perf: Disallow mmap() on per-task inherited events Message-ID: <20100519071906.GB5704@nowhere> References: <20100518133258.000434886@chello.nl> <20100518133725.885757039@chello.nl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100518133725.885757039@chello.nl> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 18, 2010 at 03:32:59PM +0200, Peter Zijlstra wrote: > Since we now have working per-task-per-cpu events for a while, > disallow mmap() on per-task inherited events. Those things were > a performance problem anyway, and doing away with it allows > us to optimize the buffer somewhat by assuming there is only a single > writer. > > Signed-off-by: Peter Zijlstra > --- That is a very good news.