From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: moreau francis <francis_moreau2000@yahoo.fr>
Cc: linux-kernel@vger.kernel.org, apw@shadowen.org
Subject: Re: sparsemem usage
Date: Wed, 02 Aug 2006 16:24:40 +0100 [thread overview]
Message-ID: <1154532280.23655.23.camel@localhost.localdomain> (raw)
In-Reply-To: <20060802134413.63901.qmail@web25814.mail.ukl.yahoo.com>
Ar Mer, 2006-08-02 am 13:44 +0000, ysgrifennodd moreau francis:
> #if (MAX_ORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS
> #error Allocator MAX_ORDER exceeds SECTION_SIZE
> #endif
>
> I'm not sure to understand why there's such check. To fix this
> I should change MAX_ORDER to 6.
>
> Is it the only way to fix that ?
The kernel allocates memory out using groups of blocks in a buddy
system. 128K is smaller than one of the blocks so the kernel cannot
handle this. You need 2MB (if I remember right) granularity for your
sections but nothing stops you marking most of the 2Mb section except
the 128K that exists as "in use"
Alan
next prev parent reply other threads:[~2006-08-02 15:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-02 13:44 moreau francis
2006-08-02 14:25 ` Andy Whitcroft
2006-08-02 15:12 ` Re : " moreau francis
2006-08-02 15:36 ` Andy Whitcroft
2006-08-03 9:56 ` Re : " moreau francis
2006-08-02 15:24 ` Alan Cox [this message]
2006-08-02 15:33 ` moreau francis
2006-08-02 16:33 ` Alan Cox
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