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Date: Fri, 20 Apr 2007 21:14:43 +0800 From: "Aubrey Li" <aubreylee@...il.com> To: "David Howells" <dhowells@...hat.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 On 4/20/07, David Howells <dhowells@...hat.com> wrote: > 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. Hmm..., I'm thinking some codes in memory reclaim depend on NR_FILE_MMAPED like follows ----snip---- if (zone_page_state(zone, NR_FILE_PAGES) - zone_page_state(zone, NR_FILE_MAPPED) > zone->min_unmapped_pages) ----snip---- Since we are enabling packet mmap feature, we should take its mapped pages into count of NR_FILE_MAPPED. -Aubrey - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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