Re: Zero page

To: tech-kern%NetBSD.org@localhost
Subject: Re: Zero page
From: Masao Uebayashi <uebayasi%tombi.co.jp@localhost>
Date: Wed, 10 Feb 2010 17:02:14 +0900

mrg@ pointed out (off-list) that sparc allocates such a page per-cpu.  Per-CPU
zeroed-page is for performance when used as a source of zeroes.  In my case,
the page is used to redirect user pages to unallocated blocks in a file.
What matters here is to reduce memory consumption.  So I've decided to
allocated a single page only "options XIP".

(I'll revisit to unify such an MD zeroed-page interface later.)

Masao

-- 
Masao Uebayashi / Tombi Inc. / Tel: +81-90-9141-4635

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