From owner-p4-projects@FreeBSD.ORG Thu Jan 1 19:23:16 2009 Return-Path: Delivered-To: p4-projects@freebsd.org Received: by hub.freebsd.org (Postfix, from userid 32767) id 1BE17106566C; Thu, 1 Jan 2009 19:23:16 +0000 (UTC) Delivered-To: perforce@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id B7AEA106564A for ; Thu, 1 Jan 2009 19:23:15 +0000 (UTC) (envelope-from mayur.shardul@gmail.com) Received: from rv-out-0506.google.com (rv-out-0506.google.com [209.85.198.229]) by mx1.freebsd.org (Postfix) with ESMTP id 4F8AE8FC12 for ; Thu, 1 Jan 2009 19:23:15 +0000 (UTC) (envelope-from mayur.shardul@gmail.com) Received: by rv-out-0506.google.com with SMTP id b25so7349639rvf.43 for ; Thu, 01 Jan 2009 11:23:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type:references; bh=PJ6oQ2EUBOSz4jB+9wZpvUjV4eq7ePNsoTugq7sHMOI=; b=qciSuclGnqt4BoCSbNTU+C9RDk49C7uARiOl1G2+pG6XFbS617TiOlF5/E3RS1KnXQ UvHWUcAReOfiZ0wtFuzQfUY/6MJ0dP0RSg0us00hPpmmNTiiqsQqQw0z70RnLAILOrhZ ZOLzBJCfo+BMx9Ymbl7AgtJa3iIy1ICDJscoc= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:references; b=Y7oXZbGUdLe6c7x7KvXtrv1UnGNO5CEqODptN5F2YWpOjUYIjlN3aGr0yny3txPfGe 2Ma0rkziZXF/rUBHN2V8CzueIY025OQMcefRytRrY1VkDMVlC9cwlfs1eIzgW5X/Kh5Z PovuoI0wdOTFvQ55Evhz/6k+T7NmXNCXebLV0= Received: by 10.140.201.8 with SMTP id y8mr2626251rvf.101.1230836111925; Thu, 01 Jan 2009 10:55:11 -0800 (PST) Received: by 10.140.164.9 with HTTP; Thu, 1 Jan 2009 10:55:11 -0800 (PST) Message-ID: <2ac427a0901011055x7e561f12w338efac38e6c5e71@mail.gmail.com> Date: Thu, 1 Jan 2009 10:55:11 -0800 From: Mayur To: "Ed Schouten" In-Reply-To: <20090101141833.GF1176@hoeg.nl> MIME-Version: 1.0 References: <200901011408.n01E8GYU036190@repoman.freebsd.org> <20090101141833.GF1176@hoeg.nl> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: Perforce Change Reviews , Alan Cox , Mayur Shardul Subject: Re: PERFORCE change 155554 for review X-BeenThere: p4-projects@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: p4 projects tree changes List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Jan 2009 19:23:17 -0000 Hi Ed, This work is not targeted to reduce the contention but this seems an interesting problem. Will look in to it. -- Mayur On Thu, Jan 1, 2009 at 6:18 AM, Ed Schouten wrote: > Hello Mayur, > > I don't know a lot about our VM subsystem, but I've got a question about > your work. Some time ago I ran a `buildkernel' with lock profiling > enabled and saw the following results (sorted by `wait_total'): > > http://80386.nl/files/lock-profiling-buildkernel.txt > > It seems to me that the "vm page queue mutex" is clearly one of the most > contended locks inside the kernel. Is your work also targeted to reduce > this contention? > > Happy 2009! > > -- > Ed Schouten > WWW: http://80386.nl/ >