From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932097Ab2DQJhh (ORCPT ); Tue, 17 Apr 2012 05:37:37 -0400 Received: from mx1.redhat.com ([209.132.183.28]:11040 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755973Ab2DQJhg (ORCPT ); Tue, 17 Apr 2012 05:37:36 -0400 Date: Tue, 17 Apr 2012 12:37:13 +0300 From: Gleb Natapov To: Jiri Olsa Cc: Peter Zijlstra , acme@ghostprotocols.net, mingo@redhat.com, linux-kernel@vger.kernel.org, avi@redhat.com Subject: Re: [PATCH] perf tools: Add 'G' and 'H' modifiers to event parsing Message-ID: <20120417093713.GD11918@redhat.com> References: <20120415145948.GK11918@redhat.com> <1334502742.28150.13.camel@twins> <20120415152300.GL11918@redhat.com> <20120416201030.GB11503@m.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120416201030.GB11503@m.brq.redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 16, 2012 at 10:10:30PM +0200, Jiri Olsa wrote: > On Sun, Apr 15, 2012 at 06:23:00PM +0300, Gleb Natapov wrote: > > On Sun, Apr 15, 2012 at 05:12:22PM +0200, Peter Zijlstra wrote: > > > On Sun, 2012-04-15 at 17:59 +0300, Gleb Natapov wrote: > > > > -modifier_event [ukhp]{1,5} > > > > +modifier_event [ukhpGH]{1,5} > > > > > > You'd also need to increase the 5 to 7 I think, unless there's a clear > > > exclusion with some of the other flags. > > > > > > Hmm, as it stands I think the 5 is already too low: "ukhppp" is 6. > > > > > > We should really write this as ['u'] ['k'] ['h'] ['G'] ['H'] ['p'{1,3}], > > > not the combined thing. > > you mean to match them strictly in parser, right? > because what we have now can match also stuff like 'uuu' 'kkuu' ... > > So far it eludes me how to do that purely in flex and > doing this via rules in bison seems like overkill. > > I'd rather keep it the way we have and do the extra check > in parse_events_modifier function.. unless someone comes up > with flex regular expression that would do that (which is > possible given my regex knowledge..) > > also we need 8 characters for it, since this seems to be > valid modifier: ukhGHppp > So want me to resend with 8 to fix missing GH for now? I can't think of proper regex either. -- Gleb.