From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756585Ab0KSTns (ORCPT ); Fri, 19 Nov 2010 14:43:48 -0500 Received: from mail-qy0-f174.google.com ([209.85.216.174]:38380 "EHLO mail-qy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755917Ab0KSTnr (ORCPT ); Fri, 19 Nov 2010 14:43:47 -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; b=ttFt6BBeUIKaqxsOM8pGfhisyeDuA8SJY3OHSzDGSpyv296Ultkw6pbQ8iFiNNAmns negHLYc3koyQKPVvhzbXJAyIBnoGMjsFllrL7+2KzKzFLO4PTQ7o1lbbie/Jz04FB0ae lY3B/BHdnXXC//y7fLX9Jm+QgIpeEvm4MxkVg= MIME-Version: 1.0 In-Reply-To: <20101116140900.039761100@kernel.dk> References: <20101116140900.039761100@kernel.dk> Date: Fri, 19 Nov 2010 11:43:45 -0800 X-Google-Sender-Auth: Tk8c6iHOXBFgVTD2YrHPjEMWZNg Message-ID: Subject: Re: [patch 00/28] [rfc] dcache scaling part 1 From: Tim Pepper To: Nick Piggin Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Nov 16, 2010 at 6:09 AM, Nick Piggin wrote: > There are 3 main parts to dcache scaling. This one primarily adds new locks > to take over dcache_lock, and some pre/post prep and streamlining patches. > > The second implements fine grained locking, and is rather trivial after > part 1. > > The third implements rcu-walk. rcu-walk depends on the first part, because it > relies on using d_lock to protect the state of the dentry (when converting from > rcu-walk to refcounted walk). Without the fine grained locing, we'd need to use > dcache_lock for that, which would be a step backwards to put into path walking > again. Reviewed-by: Tim Pepper