From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753655Ab0ELSAV (ORCPT ); Wed, 12 May 2010 14:00:21 -0400 Received: from bombadil.infradead.org ([18.85.46.34]:34309 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752148Ab0ELSAS (ORCPT ); Wed, 12 May 2010 14:00:18 -0400 Subject: Re: Perf and ftrace [was Re: PyTimechart] From: Peter Zijlstra To: Mathieu Desnoyers Cc: Frederic Weisbecker , Steven Rostedt , Pierre Tardy , Ingo Molnar , Arnaldo Carvalho de Melo , Tom Zanussi , Paul Mackerras , linux-kernel@vger.kernel.org, arjan@infradead.org, ziga.mahkovec@gmail.com, davem In-Reply-To: <20100512175305.GB32496@Krystal> References: <20100511213625.GD5422@nowhere> <20100512144811.GA5405@nowhere> <1273678596.27703.30.camel@gandalf.stny.rr.com> <20100512164650.GH5405@nowhere> <1273683624.1626.127.camel@laptop> <20100512170734.GA15953@Krystal> <1273686425.1626.142.camel@laptop> <20100512175305.GB32496@Krystal> Content-Type: text/plain; charset="UTF-8" Date: Wed, 12 May 2010 20:00:12 +0200 Message-ID: <1273687212.1626.147.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2010-05-12 at 13:53 -0400, Mathieu Desnoyers wrote: > > Would you be fine with an alternative implementation and API that support both > mmap() and splice(), without any need to swap pages ? Sure, what did you have in mind? You basically give you page to splice, never to see it again, you'd need to fill that hole in your buffer again.