linux-kernel - Re: [GIT] Bcache version 12

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Message-ID: <20110921025545.GB5521@moria>
Date:	Tue, 20 Sep 2011 19:55:45 -0700
From:	Kent Overstreet <kent.overstreet@...il.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, rdunlap@...otime.net,
	axboe@...nel.dk, akpm@...ux-foundation.org, neilb@...e.de
Subject: Re: [GIT] Bcache version 12

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
> <kent.overstreet@...il.com> 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.
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