From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1753988Ab1ECXIT (ORCPT <rfc822;w@1wt.eu>);
	Tue, 3 May 2011 19:08:19 -0400
Received: from mail-ww0-f44.google.com ([74.125.82.44]:39979 "EHLO
	mail-ww0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1753918Ab1ECXIS (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Tue, 3 May 2011 19:08:18 -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=aoT/emdKqp+V6tKh6HVY86DFWHQirWiAZYZcZ8DFXxT4KpgtF4V9E3NKVdVchzlbym
         mGpPMezlxdLNAB78ywOQrI0p/CyoiOnZGGebUKvQB5LWhYCta1Po/33j55kNAGBhRCSo
         QpnOfsnlm7hIp+bAQD9IidqirIQeG3HMd/ULM=
Date: Wed, 4 May 2011 01:08:14 +0200
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Vaibhav Nagarnaik <vnagarnaik@google.com>, Ingo Molnar <mingo@redhat.com>,
        Michael Rubin <mrubin@google.com>, David Sharp <dhsharp@google.com>,
        linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH] tracing: Don't call wakeup() when committing the
 event
Message-ID: <20110503230812.GF2678@nowhere>
References: <1304456616-30281-1-git-send-email-vnagarnaik@google.com>
 <20110503214142.GC2678@nowhere>
 <BANLkTinA8M8Ok2jghtCoeBiTfw6n3NSziA@mail.gmail.com>
 <20110503220948.GE2678@nowhere>
 <1304462852.25414.2417.camel@gandalf.stny.rr.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1304462852.25414.2417.camel@gandalf.stny.rr.com>
User-Agent: Mutt/1.5.20 (2009-06-14)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue, May 03, 2011 at 06:47:32PM -0400, Steven Rostedt wrote:
> On Wed, 2011-05-04 at 00:09 +0200, Frederic Weisbecker wrote:
> 
> > I wonder if we should have a lite version of wake_up() that checks
> > if the list of waiters is empty before locking the queue.
> > After all we don't care much about tight races for tracing.
> 
> Since tracing is a special case here, we probably could get away to just
> do it ourselves. That is, have our own flag that determines if we should
> wakeup or not.

Yep, agreed.