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Date:	Fri, 20 Apr 2007 11:17:27 +0200
From:	Eric Dumazet <>
To:	David Howells <>
Cc:	"Aubrey Li" <>,
	"Robin Getz" <>,,, "Alan Cox" <>,,,
	"Andrew Morton" <>,
	"Linux Kernel" <>
Subject: Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU

On Fri, 20 Apr 2007 09:58:52 +0100
David Howells <> wrote:
> 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.

Interesting, that rings a bell here.

I wonder why we dont use this in alloc_large_system_hash().

(if __get_free_pages(GFP_ATOMIC, order) is used instead of alloc_bootmem() or __vmalloc())

We currently loose 1/4 of space on tcp hash table for example, because sizeof(inet_ehash_bucket) is not a power of 2.

Is it really possible to allocate an order-10 page, then release part of it (say an order-8 subpage) ?

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