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Subject: Re: [PATCH RFC 1/1] numa: fix /proc/<pid>/numa_maps for THP
References: <1454686440-31218-1-git-send-email-gerald.schaefer@de.ibm.com>
 <1454686440-31218-2-git-send-email-gerald.schaefer@de.ibm.com>
From: Dave Hansen <dave.hansen@intel.com>
Message-ID: <56B4C1E1.6060408@intel.com>
Date: Fri, 5 Feb 2016 07:38:09 -0800
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To: Gerald Schaefer <gerald.schaefer@de.ibm.com>, Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Konstantin Khlebnikov <koct9i@gmail.com>, Michal Hocko <mhocko@suse.com>, Vlastimil Babka <vbabka@suse.cz>, Jerome Marchand <jmarchan@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>, Mel Gorman <mgorman@suse.de>, Dan Williams <dan.j.williams@intel.com>, Ross Zwisler <ross.zwisler@linux.intel.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Martin Schwidefsky <schwidefsky@de.ibm.com>, Heiko Carstens <heiko.carstens@de.ibm.com>, Michael Holzheu <holzheu@linux.vnet.ibm.com>

On 02/05/2016 07:34 AM, Gerald Schaefer wrote:
> +static struct page *can_gather_numa_stats_pmd(pmd_t pmd,
> +					      struct vm_area_struct *vma,
> +					      unsigned long addr)
> +{

Is there a way to do this without making a copy of most of
can_gather_numa_stats()?  Seems like the kind of thing where the pmd
version will bitrot.

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