linux-kernel - Re: [PATCH v5 5/6] x86, acpi, crash, kdump: Do reserve

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Message-ID: <1380323662.14046.51.camel@misato.fc.hp.com>
Date:	Fri, 27 Sep 2013 17:14:22 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Zhang Yanfei <zhangyanfei.yes@...il.com>
Cc:	"Rafael J . Wysocki" <rjw@...k.pl>, lenb@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>, mingo@...e.hu,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Thomas Renninger <trenn@...e.de>,
	Yinghai Lu <yinghai@...nel.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	mina86@...a86.com, gong.chen@...ux.intel.com,
	vasilis.liaskovitis@...fitbricks.com, lwoodman@...hat.com,
	Rik van Riel <riel@...hat.com>, jweiner@...hat.com,
	prarit@...hat.com, "x86@...nel.org" <x86@...nel.org>,
	linux-doc@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>, linux-acpi@...r.kernel.org,
	imtangchen@...il.com, Zhang Yanfei <zhangyanfei@...fujitsu.com>
Subject: Re: [PATCH v5 5/6] x86, acpi, crash, kdump: Do
 reserve_crashkernel() after SRAT is parsed

On Wed, 2013-09-25 at 02:34 +0800, Zhang Yanfei wrote:
> From: Tang Chen <tangchen@...fujitsu.com>
> 
> Memory reserved for crashkernel could be large. So we should not allocate
> this memory bottom up from the end of kernel image.
> 
> When SRAT is parsed, we will be able to know whihc memory is hotpluggable,
> and we can avoid allocating this memory for the kernel. So reorder
> reserve_crashkernel() after SRAT is parsed.
> 
> Acked-by: Tejun Heo <tj@...nel.org>
> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> Reviewed-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
> ---
>  arch/x86/kernel/setup.c |    8 ++++++--
>  1 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index f0de629..36cfce3 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -1120,8 +1120,6 @@ void __init setup_arch(char **cmdline_p)
>  	acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
>  #endif
>  
> -	reserve_crashkernel();
> -
>  	vsmp_init();
>  
>  	io_delay_init();
> @@ -1136,6 +1134,12 @@ void __init setup_arch(char **cmdline_p)
>  	initmem_init();
>  	memblock_find_dma_reserve();
>  
> +	/*
> +	 * Reserve memory for crash kernel after SRAT is parsed so that it
> +	 * won't consume hotpluggable memory.
> +	 */
> +	reserve_crashkernel();

Out of curiosity, is there any particular reason why it is moved after
memblock_find_dma_reserve(), not initmem_init()?

Thanks,
-Toshi

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