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Date: Fri, 4 Jan 2002 14:59:49 -0600
From: Tommy Reynolds <reynolds@redhat.com>
To: "Steffen Persvold" <sp@scali.no>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Short question about the mmap method
Message-Id: <20020104145949.682d51c4.reynolds@redhat.com>
In-Reply-To: <3C360FD5.91285F5D@scali.no>
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Organization: Red Hat Software, Inc. / Embedded Development
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Uttered "Steffen Persvold" <sp@scali.no>, spoke thus:

> Hi lkml readers,
> 
> I have a question regarding drivers implementing the mmap and nopage methods.
> In some references I've read that pages in kernel allocated memory (either
> allocated with kmalloc, vmalloc or__get_free_pages) should be set to reserved
> (mem_map_reserve or set_bit(PG_reserved, page->flags) before they can be
> mmap'ed to guarantee that they can't be swapped out. Is this true ?

[kv]malloc memory is _never_ subject to paging and can be mmap'ed with a
vengeance without resorting to mucking about with marking pages or the like.

You're working too hard ;-)

-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- + -- -- -- -- -- -- -- -- -- --
Tommy Reynolds                               | mailto: <reynolds@redhat.com>
Red Hat, Inc., Embedded Development Services | Phone:  +1.256.704.9286
307 Wynn Drive NW, Huntsville, AL 35805 USA  | FAX:    +1.256.837.3839
Senior Software Developer                    | Mobile: +1.919.641.2923

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