Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754112AbaA0Sfo (ORCPT ); Mon, 27 Jan 2014 13:35:44 -0500 Received: from g4t0017.houston.hp.com ([15.201.24.20]:27415 "EHLO g4t0017.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753651AbaA0Sfm (ORCPT ); Mon, 27 Jan 2014 13:35:42 -0500 Message-ID: <52E6509E.5080103@hp.com> Date: Mon, 27 Jan 2014 05:27:10 -0700 From: Thavatchai Makphaibulchoke User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: Andreas Dilger , Andi Kleen CC: T Makphaibulchoke , "viro@zeniv.linux.org.uk" , "tytso@mit.edu" , "adilger.kernel@dilger.ca" , "linux-ext4@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "aswin@hp.com" Subject: Re: [PATCH v4 0/3] ext4: increase mbcache scalability References: <1377186876-57291-1-git-send-email-tmac@hp.com> <1390588288-66930-1-git-send-email-tmac@hp.com> <87fvodcb65.fsf@tassilo.jf.intel.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/24/2014 11:09 PM, Andreas Dilger wrote: > I think the ext4 block groups are locked with the blockgroup_lock that has about the same number of locks as the number of cores, with a max of 128, IIRC. See blockgroup_lock.h. > > While there is some chance of contention, it is also unlikely that all of the cores are locking this area at the same time. > > Cheers, Andreas > Thanks Andreas for the suggestion. Will try that versus adding just a new private spinlock array in mbcache and compare the performance. Thanks, Mak. -- 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/