linux-kernel - Re: missing madvise functionality

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Message-Id: <20070403141656.1e25b878.akpm@linux-foundation.org>
Date:	Tue, 3 Apr 2007 14:16:56 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rik van Riel <riel@...hat.com>
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

On Tue, 03 Apr 2007 17:00:09 -0400
Rik van Riel <riel@...hat.com> wrote:

> 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.
> 

ah, yes, you're right.  That part should work nicely.
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