linux-kernel - Re: Page alignment issue

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Message-ID: <6d6a94c50612271949l66265cd4v4c63c1bdf3984417@mail.gmail.com>
Date:	Thu, 28 Dec 2006 11:49:37 +0800
From:	Aubrey <aubreylee@...il.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	"Nick Piggin" <nickpiggin@...oo.com.au>
Subject: Re: Page alignment issue

On 12/27/06, Aubrey <aubreylee@...il.com> wrote:
> As for the buddy system, much of docs mention the physical address of
> the first page frame of a block should be a multiple of the group
> size. For example, the initial address of a 16-page-frame block should
> be 16-page aligned. I happened to encounted an issue that the physical
> addresss pf the block is not 4-page aligned(0x36c9000) while the order
> of the block is 2. I want to know what out of buddy algorithm depend
> on this feature? My problem seems to happen in
> schedule()->context_switch() call, but so far I didn't figure out the
> root cause.

It seems nothing depend on this feature. the problem you encounted is
the kernel task stack should be 2-page aligned.

-Aubrey
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