linux-kernel - Re: [RFC PATCH 02/12] mm: introduce mirror

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Date:	Fri, 5 Jun 2015 09:53:54 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	"Luck, Tony" <tony.luck@...el.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"nao.horiguchi@...il.com" <nao.horiguchi@...il.com>,
	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"mingo@...e.hu" <mingo@...e.hu>, Xiexiuqi <xiexiuqi@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 02/12] mm: introduce mirror_info

On 2015/6/5 0:57, Luck, Tony wrote:

> +#ifdef CONFIG_MEMORY_MIRROR
> +struct numa_mirror_info {
> +	int node;
> +	unsigned long start;
> +	unsigned long size;
> +};
> +
> +struct mirror_info {
> +	int count;
> +	struct numa_mirror_info info[MAX_NUMNODES];
> +};
> 
> Do we really need this?  My patch series leaves all the mirrored memory in
> the memblock allocator tagged with the MEMBLOCK_MIRROR flag.  Can't
> we use that information when freeing the boot memory into the runtime
> free lists?
> 

Hi Tony,

I used this code for testing before, so when your patchset added to mainline,
I'll rewrite it, use MEMBLOCK_MIRROR, not mirror_info. 

I find Andrew has added your patches to mm-tree, right?

Thanks,
Xishi Qiu

> If we can't ... then [MAX_NUMNODES] may not be enough.  We may have
> more than one mirrored range on each node. Current h/w allows two ranges
> per node.
> 
> -Tony
> 
> .
> 



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