From: Yasunori Goto <y-goto@jp.fujitsu.com>
To: Gary Hade <garyhade@us.ibm.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Badari Pulavarty <pbadari@us.ibm.com>, Mel Gorman <mel@csn.ul.ie>,
Chris McDermott <lcm@us.ibm.com>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Greg KH <greg@kroah.com>, Dave Hansen <dave@linux.vnet.ibm.com>,
Nish Aravamudan <nish.aravamudan@gmail.com>
Subject: Re: [PATCH] mm: show node to memory section relationship with symlinks in sysfs
Date: Tue, 30 Sep 2008 17:06:08 +0900 [thread overview]
Message-ID: <20080930163324.44A7.E1E9C6FF@jp.fujitsu.com> (raw)
In-Reply-To: <20080929200509.GC21255@us.ibm.com>
> +#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
> +int register_mem_sect_under_node(struct memory_block *mem_blk)
:
I think this patch is convenience even when memory hotplug is disabled.
CONFIG_SPARSEMEM seems better than CONFIG_MEMORY_HOTPLUG_SPARSE.
> +int register_mem_sect_under_node(struct memory_block *mem_blk)
> +{
> + unsigned int nid;
> +
> + if (!mem_blk)
> + return -EFAULT;
> + nid = section_nr_to_nid(mem_blk->phys_index);
(snip)
> +#define section_nr_to_nid(section_nr) pfn_to_nid(section_nr_to_pfn(section_nr))
> #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
If the first page of the section is not valid, then this section_nr_to_nid()
doesn't return correct value.
I tested this patch. In my box, the start_pfn of node 1 is 1200400, but
section_nr_to_pfn(mem_blk->phys_index) returns 1200000. As a result,
the section is linked to node 0.
Bye.
--
Yasunori Goto
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next prev parent reply other threads:[~2008-09-30 8:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-29 20:05 Gary Hade
2008-09-30 8:06 ` Yasunori Goto [this message]
2008-09-30 15:50 ` Dave Hansen
2008-09-30 19:41 ` Gary Hade
2008-10-01 2:48 ` Yasunori Goto
2008-10-01 16:51 ` Gary Hade
2008-09-30 23:29 ` Gary Hade
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