From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kent Overstreet Subject: Re: [GIT] Bcache version 12 Date: Tue, 20 Sep 2011 19:55:45 -0700 Message-ID: <20110921025545.GB5521@moria> References: <20110910064531.GA32536@moria> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, rdunlap-/UHa2rfvQTnk1uMJSBkQmQ@public.gmane.org, axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, neilb-l3A5Bk7waGM@public.gmane.org To: Pekka Enberg Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-bcache-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-fsdevel.vger.kernel.org On Mon, Sep 19, 2011 at 10:28:03AM +0300, Pekka Enberg wrote: > Hi Kent, > > On Sat, Sep 10, 2011 at 9:45 AM, Kent Overstreet > wrote: > > bcache, n.: a cache for arbitrary block devices that uses an SSD > > > > It's probably past time I started poking people to see about getting > > this stuff in. It's synced up with mainline, the documentation is for > > once relatively up to date, and it looks just about production ready. > > > > Suggestions are more than welcome on how to make it easier to review - > > it's entirely too much code, I know (near 10k lines now). I'll be > > emailing the patches that touch other parts of the kernel separately. > > > > Short overview: > > Bcache does both writethrough and writeback caching. It presents itself > > as a new block device, a bit like say md. You can cache an arbitrary > > number of block devices with a single cache device, and attach and > > detach things at runtime - it's quite flexible. > > The changelog is pretty useless for people like myself who have never > heard of bcache before because it lacks any explanation why bcache is > useful (i.e. a real-world use case). > > Pekka Well, I think you'll want the documentation for that - Documentation/bcache.txt is somewhat up to date and should answer that decently. Short version: bcache is for making IO faster.