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Message-ID: <a36005b50704220955u7153ea76sef403442bbc805a5@mail.gmail.com>
Date: Sun, 22 Apr 2007 09:55:18 -0700
From: "Ulrich Drepper" <drepper@gmail.com>
To: "Christoph Hellwig" <hch@infradead.org>,
       "Andrew Morton" <akpm@linux-foundation.org>,
       "Rik van Riel" <riel@redhat.com>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       linux-mm <linux-mm@kvack.org>, "David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH] lazy freeing of memory through MADV_FREE
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On 4/22/07, Christoph Hellwig <hch@infradead.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.