linux-kernel - Re: [PATCH] mm: cma: fix accounting of CMA pages placed in high memory

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Message-ID: <CAH9JG2Usd4HJKrBXwX3aEc3i6068zU=F=RjcoQ8E8uxYGrwXgg@mail.gmail.com>
Date:	Tue, 5 Feb 2013 08:29:26 +0900
From:	Kyungmin Park <kmpark@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, minchan@...nel.org, mgorman@...e.de
Subject: Re: [PATCH] mm: cma: fix accounting of CMA pages placed in high memory

On Tue, Feb 5, 2013 at 8:06 AM, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Mon, 04 Feb 2013 11:27:05 +0100
> Marek Szyprowski <m.szyprowski@...sung.com> wrote:
>
>> The total number of low memory pages is determined as
>> totalram_pages - totalhigh_pages, so without this patch all CMA
>> pageblocks placed in highmem were accounted to low memory.
>
> What are the end-user-visible effects of this bug?

Even though CMA is located at highmem. LowTotal has more than lowmem
address spaces.

e.g.,
lowmem  : 0xc0000000 - 0xdf000000   ( 496 MB)
LowTotal:         555788 kB

>
> (This information is needed so that others can make patch-scheduling
> decisions and should be included in all bugfix changelogs unless it is
> obvious).

CMA Highmem support is new feature. so don't need to go stable tree.

Thank you,
Kyungmin Park
>
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