Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755249Ab0ARMvN (ORCPT ); Mon, 18 Jan 2010 07:51:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754739Ab0ARMvL (ORCPT ); Mon, 18 Jan 2010 07:51:11 -0500 Received: from mail-fx0-f225.google.com ([209.85.220.225]:55246 "EHLO mail-fx0-f225.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754593Ab0ARMvJ convert rfc822-to-8bit (ORCPT ); Mon, 18 Jan 2010 07:51:09 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=YiN6EjV5b8QhU3yoAZiZuBnmSoNXOceQ2yj9z3yO8MmoMKPwAiWlBgJlKyUm3Rsz9J ZmeP7fNkPn/Qp1Bwy7LsK97UCXGPM+NN/Nzpn7J90USZgI1mII9HyfFzNYxXIWwhrJdu wx0yZKlGHrG+JTU+xQdFCDD67euy1wnwvxSWg= MIME-Version: 1.0 In-Reply-To: <20100118124419.GC1628@linux.vnet.ibm.com> References: <1263740593.557.20967.camel@twins> <1263800752.4283.19.camel@laptop> <4B543F93.3060509@redhat.com> <1263815072.4283.305.camel@laptop> <4B544D7C.2060708@redhat.com> <1263816396.4283.361.camel@laptop> <4B544F8E.1080603@redhat.com> <84144f021001180413w76a8ca2axb0b9f07ee4dea67e@mail.gmail.com> <4B545146.3080001@redhat.com> <20100118124419.GC1628@linux.vnet.ibm.com> Date: Mon, 18 Jan 2010 14:51:06 +0200 X-Google-Sender-Auth: 53741515c4dcdfce Message-ID: <84144f021001180451k2a84f17x3dc24796fea986c9@mail.gmail.com> Subject: Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP) From: Pekka Enberg To: Srikar Dronamraju Cc: Avi Kivity , Peter Zijlstra , ananth@in.ibm.com, Jim Keniston , Ingo Molnar , Arnaldo Carvalho de Melo , utrace-devel , Frederic Weisbecker , Masami Hiramatsu , Maneesh Soni , Mark Wielaard , LKML Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 925 Lines: 21 On Mon, Jan 18, 2010 at 2:44 PM, Srikar Dronamraju wrote: > * Avi Kivity [2010-01-18 14:17:10]: > >> On 01/18/2010 02:13 PM, Pekka Enberg wrote: >> >So how big chunks of the address space are we talking here for uprobes? >> >> That's for the authors to answer, but at a guess, 32 bytes per probe >> (largest x86 instruction is 15 bytes), so 32 MB will give you a >> million probes. ?That's a piece of cake for x86-64, probably harder >> to justify for i386. > > On x86, each probe takes 16 bytes. And how many probes do we expected to be live at the same time in real-world scenarios? I guess Avi's "one million" is more than enough? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/