Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757269Ab0LPUou (ORCPT ); Thu, 16 Dec 2010 15:44:50 -0500 Received: from canuck.infradead.org ([134.117.69.58]:42280 "EHLO canuck.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753689Ab0LPUot convert rfc822-to-8bit (ORCPT ); Thu, 16 Dec 2010 15:44:49 -0500 Subject: Re: [PATCH/RFC 1/2] jump label: make enable/disable o(1) From: Peter Zijlstra To: Mathieu Desnoyers Cc: Jason Baron , athieu.desnoyers@polymtl.ca, hpa@zytor.com, rostedt@goodmis.org, mingo@elte.hu, tglx@linutronix.de, andi@firstfloor.org, roland@redhat.com, rth@redhat.com, masami.hiramatsu.pt@hitachi.com, fweisbec@gmail.com, avi@redhat.com, davem@davemloft.net, sam@ravnborg.org, ddaney@caviumnetworks.com, michael@ellerman.id.au, linux-kernel@vger.kernel.org In-Reply-To: <20101216203603.GA15610@Krystal> References: <1292526602.2708.57.camel@laptop> <20101216192303.GB2856@redhat.com> <1292528031.2708.77.camel@laptop> <20101216193635.GC2856@redhat.com> <1292528501.2708.80.camel@laptop> <20101216194852.GD2856@redhat.com> <20101216203603.GA15610@Krystal> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Thu, 16 Dec 2010 21:43:41 +0100 Message-ID: <1292532221.2708.93.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 619 Lines: 12 On Thu, 2010-12-16 at 15:36 -0500, Mathieu Desnoyers wrote: > Tracepoints keep their own reference counts for enable/disable, so a > simple "enable/disable" is fine as far as tracepoints are concerned. Why > does perf need that refcounting done by the static jumps ? Because the refcount is all we have... Why not replace that tracepoint refcount with the jumplabel thing? -- 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/