linux-kernel - Re: [PATCH] lazy freeing of memory through MADV

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Message-ID: <a36005b50704220955u7153ea76sef403442bbc805a5@mail.gmail.com>
Date:	Sun, 22 Apr 2007 09:55:18 -0700
From:	"Ulrich Drepper" <drepper@...il.com>
To:	"Christoph Hellwig" <hch@...radead.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Rik van Riel" <riel@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] lazy freeing of memory through MADV_FREE

On 4/22/07, Christoph Hellwig <hch@...radead.org> wrote:
> Why isn't MADV_FREE defined to 5 for linux?  It's our first free madv
> value?  Also the behaviour should better match the one in solaris or BSD,
> the last thing we need is slightly different behaviour from operating
> systems supporting this for ages.

The behavior should indeed be identical.  Both implementations
restrict MADV_FREE to work on anonymous memory and it is unspecified
whether a renewed access yields to a zerod page being created or
whether the old content is still there.  So, just use 0x5 for both the
Linux and Solaris version on sparc.
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