linux-kernel - Re: [RFC PATCH 0/7] evacuate struct page from the block layer

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Message-ID: <550C490E.1080708@redhat.com>
Date:	Fri, 20 Mar 2015 12:21:34 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Matthew Wilcox <willy@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	axboe@...nel.dk, linux-nvdimm@...1.01.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	linux-raid@...r.kernel.org, mgorman@...e.de, hch@...radead.org,
	linux-fsdevel@...r.kernel.org,
	"Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [RFC PATCH 0/7] evacuate struct page from the block layer

On 03/19/2015 09:43 AM, Matthew Wilcox wrote:

> 1. Construct struct pages for persistent memory
> 1a. Permanently
> 1b. While the pages are under I/O

Michael Tsirkin and I have been doing some thinking about what
it would take to allocate struct pages per 2MB area permanently,
and allocate additional struct pages for 4kB pages on demand,
when a 2MB area is broken up into 4kB pages.

This should work for both DRAM and persistent memory.

I am still not convinced it is worthwhile to have struct pages
for persistent memory though, but I am willing to change my mind.

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