From: Yasuaki Ishimatsu <yasu.isimatu@gmail.com>
To: Xishi Qiu <qiuxishi@huawei.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>,
Mel Gorman <mgorman@suse.de>,
David Rientjes <rientjes@google.com>,
Tang Chen <tangchen@cn.fujitsu.com>,
zhongjiang@huawei.com, Linux MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm: skip if required_kernelcore is larger than totalpages
Date: Fri, 09 Oct 2015 08:41:02 -0700 (PDT) [thread overview]
Message-ID: <5617e00e.0c5b8c0a.2d0dd.3faa@mx.google.com> (raw)
In-Reply-To: <5615D311.5030908@huawei.com>
On Thu, 8 Oct 2015 10:21:05 +0800
Xishi Qiu <qiuxishi@huawei.com> wrote:
> If kernelcore was not specified, or the kernelcore size is zero
> (required_movablecore >= totalpages), or the kernelcore size is larger
Why does required_movablecore become larger than totalpages, when the
kernelcore size is zero? I read the code but I could not find that you
mention.
Thanks,
Yasuaki Ishimatsu
> than totalpages, there is no ZONE_MOVABLE. We should fill the zone
> with both kernel memory and movable memory.
>
> Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
> ---
> mm/page_alloc.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index af3c9bd..6a6da0d 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5674,8 +5674,11 @@ static void __init find_zone_movable_pfns_for_nodes(void)
> required_kernelcore = max(required_kernelcore, corepages);
> }
>
> - /* If kernelcore was not specified, there is no ZONE_MOVABLE */
> - if (!required_kernelcore)
> + /*
> + * If kernelcore was not specified or kernelcore size is larger
> + * than totalpages, there is no ZONE_MOVABLE.
> + */
> + if (!required_kernelcore || required_kernelcore >= totalpages)
> goto out;
>
> /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */
> --
> 2.0.0
>
>
> --
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next prev parent reply other threads:[~2015-10-09 15:41 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-08 2:21 [PATCH] mm: skip if required_kernelcore is larger than totalpages Xishi Qiu
2015-10-09 15:41 ` Yasuaki Ishimatsu [this message]
2015-10-12 1:37 ` Xishi Qiu
2015-10-14 2:50 ` Tang Chen
2015-10-14 3:28 ` Xishi Qiu
2015-10-14 4:03 ` Tang Chen
2015-10-16 16:58 ` Yasuaki Ishimatsu
2015-10-14 2:31 ` David Rientjes
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