From: Andi Kleen <andi@firstfloor.org>
To: Ananya Muddukrishna <ananya@kth.se>
Cc: linux-numa@vger.kernel.org
Subject: Re: How to make get_mempolicy return a node id list for an address range?
Date: Tue, 10 Jan 2012 23:04:12 +0100 [thread overview]
Message-ID: <20120110220412.GA11715@one.firstfloor.org> (raw)
In-Reply-To: <loom.20120109T094056-260@post.gmane.org>
On Mon, Jan 09, 2012 at 09:09:30AM +0000, Ananya Muddukrishna wrote:
> Hi,
>
> Given a range of virtual addresses (begin and end) which are allocated using
> MPOL_INTERLEAVE, is there a quick way to know how this range is mapped to
> different NUMA nodes? In particular, I would like to have a weighted node-id
> list, where each node id in the list indicates how many address (or pages) are
> mapped to it, similar to what is seen in /proc/<proc_id>/numa_maps.
You could just parse that?
>
> I am thinking of doing this by using get_mempolicy(MPOL_F_NODE|MPOL_F_ADDR) for
> every address in the range. This can be optimized for full correctness if I know
> the starting address of all pages contained in the range. Can you give me some
> tips on how to obtain that?
You could use mincore(), but it won't handle the case of the memory being
swapped out.
-Andi
prev parent reply other threads:[~2012-01-10 22:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-09 9:09 How to make get_mempolicy return a node id list for an address range? Ananya Muddukrishna
2012-01-10 22:04 ` Andi Kleen [this message]
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