linux-kernel - Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors

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Date:	Thu, 23 Jan 2014 14:54:37 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
cc:	Dave Chinner <david@...morbit.com>, Chris Mason <clm@...com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"mgorman@...e.de" <mgorman@...e.de>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"lsf-pc@...ts.linux-foundation.org" 
	<lsf-pc@...ts.linux-foundation.org>,
	"rwheeler@...hat.com" <rwheeler@...hat.com>
Subject: Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors - going
 beyond 4096 bytes

On Thu, 23 Jan 2014, James Bottomley wrote:

> If the compound page infrastructure exists today and is usable for this,
> what else do we need to do? ... because if it's a couple of trivial
> changes and a few minor patches to filesystems to take advantage of it,
> we might as well do it anyway.  I was only objecting on the grounds that
> the last time we looked at it, it was major VM surgery.  Can someone
> give a summary of how far we are away from being able to do this with
> the VM system today and what extra work is needed (and how big is this
> piece of work)?

The main problem for me was the page cache. The VM would not be such a
problem. Changing the page cache function required updates to many
filesystems.


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