From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tao Ma Date: Thu, 15 Jul 2010 11:04:37 +0800 Subject: [Ocfs2-devel] [PATCH 0/5 v2] Add readahead support in CoW for reflinked files. In-Reply-To: <20100715023156.GB14909@mail.oracle.com> References: <4C3D6CBA.10401@oracle.com> <20100715023156.GB14909@mail.oracle.com> Message-ID: <4C3E7AC5.3030905@oracle.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ocfs2-devel@oss.oracle.com On 07/15/2010 10:31 AM, Joel Becker wrote: > On Wed, Jul 14, 2010 at 03:52:26PM +0800, Tao Ma wrote: >> When we try to CoW some clusters for a reflinked file, we have to >> read the contents first, allocate some clusters and then map these >> pages to the new clusters. Currently, we use block_read_full_page to >> read it, but it is a little bit slower. >> So this patch set try to add readahead support for CoW. Before we >> start, we call readahead first so that the pages can be read at the >> very first. And during CoW, when we find a readahead page, we know >> that we need to move the readahead window, so a new asyncreadahead >> is called. > > I think this looks good. Can you create a branch in your git > tree for it? I'll pull when I build merge-window. done. please pull from git://oss.oracle.com/git/tma/linux-2.6.git cow_readahead. Regards, Tao