* How to make get_mempolicy return a node id list for an address range?
@ 2012-01-09 9:09 Ananya Muddukrishna
2012-01-10 22:04 ` Andi Kleen
0 siblings, 1 reply; 2+ messages in thread
From: Ananya Muddukrishna @ 2012-01-09 9:09 UTC (permalink / raw)
To: linux-numa
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.
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?
Thank you!
Best regards,
Ananya
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: How to make get_mempolicy return a node id list for an address range?
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
0 siblings, 0 replies; 2+ messages in thread
From: Andi Kleen @ 2012-01-10 22:04 UTC (permalink / raw)
To: Ananya Muddukrishna; +Cc: linux-numa
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
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2012-01-09 9:09 How to make get_mempolicy return a node id list for an address range? Ananya Muddukrishna
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