linux-kernel - Page alignment issue

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Message-ID: <6d6a94c50612270749j77cd53a9mba6280e4129d9d5a@mail.gmail.com>
Date:	Wed, 27 Dec 2006 23:49:43 +0800
From:	Aubrey <aubreylee@...il.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	"Nick Piggin" <nickpiggin@...oo.com.au>
Subject: Page alignment issue

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.

Any clue or suggestion will be really appreciated!
Thanks,
-Aubrey
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