linux-kernel - Re: missing madvise functionality

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Message-ID: <4612BB44.3060100@redhat.com>
Date:	Tue, 03 Apr 2007 16:38:28 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Jakub Jelinek <jakub@...hat.com>
CC:	Ulrich Drepper <drepper@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Hugh Dickins <hugh@...itas.com>
Subject: Re: missing madvise functionality

Jakub Jelinek wrote:

> My guess is that all the page zeroing is pretty expensive as well and
> takes significant time, but I haven't profiled it.

I'm pretty sure that page freeing, reallocating and zeroing
is more expensive than just letting the page sit there and
only reclaim it lazily when we need the memory.

I'll try to whip up a patch this week.

-- 
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