linux-kernel - Re: missing madvise functionality

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Message-ID: <4612C059.8070702@redhat.com>
Date:	Tue, 03 Apr 2007 17:00:09 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Ulrich Drepper <drepper@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Jakub Jelinek <jakub@...hat.com>, linux-mm@...ck.org,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: missing madvise functionality

Andrew Morton wrote:

> Oh.  I was assuming that we'd want to unmap these pages from pagetables and
> mark then super-easily-reclaimable.  So a later touch would incur a minor
> fault.
> 
> But you think that we should leave them mapped into pagetables so no such
> fault occurs.

> Leaving the pages mapped into pagetables means that they are considerably
> less likely to be reclaimed.

If we move the pages to a place where they are very likely to be
reclaimed quickly (end of the inactive list, or a separate
reclaim list) and clear the dirty and referenced lists, we can
both reclaim the page easily *and* avoid the page fault penalty.

-- 
Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is.  Each group
calls the other unpatriotic.
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