linux-kernel - Re: [PATCH 1/5] staging: zsmalloc: zsmalloc memory allocation library

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Date:	Wed, 08 Feb 2012 09:21:43 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
CC:	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Nitin Gupta <ngupta@...are.org>,
	Brian King <brking@...ux.vnet.ibm.com>,
	Konrad Wilk <konrad.wilk@...cle.com>, linux-mm@...ck.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org
Subject: Re: [PATCH 1/5] staging: zsmalloc: zsmalloc memory allocation library

On 02/08/2012 09:15 AM, Dan Magenheimer wrote:
> The zsmalloc allocator can grab
> any random* page "A" with X unused bytes at the END of the page,
> and any random page "B" with Y unused bytes at the BEGINNING of the page
> and "coalesce" them to store any byte sequence with a length** Z
> not exceeding X+Y.  Presumably this markedly increases
> the density of compressed-pages-stored-per-physical-page***.

Ahh, I did miss that.  I assumed it was simply trying to tie two order-0
pages together.  I _guess_ the vmap() comment stands, though.

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