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Message-ID: <2181.1177059532@redhat.com>
Date: Fri, 20 Apr 2007 09:58:52 +0100
From: David Howells <dhowells@...hat.com>
To: "Aubrey Li" <aubreylee@...il.com>
Cc: "Robin Getz" <rgetz@...ckfin.uclinux.org>, uaca@...mni.uv.es,
bryan.wu@...log.com, "Alan Cox" <alan@...rguk.ukuu.org.uk>,
waltje@...lt.nl.mugnet.org, netdev@...r.kernel.org,
"Andrew Morton" <akpm@...l.org>,
"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
Aubrey Li <aubreylee@...il.com> wrote:
> as checked in packet_set_ring, buffer size must be a multiple of PAGE_SIZE,
> --------------------packet_set_ring------------------------
> if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
>
> So why not use __get_free_pages rather than kmalloc,
Because kmalloc() may be able to get us a smaller chunk of memory. Actually,
calling __get_free_pages() might be a better, and then release the excess
pages.
> so that we have pagetables to count?
There are no pagetables in NOMMU-mode.
David
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