linux-kernel - Re: [RFC PATCH] Add /proc/<pid>/numa

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Message-ID: <alpine.DEB.2.21.1805080747480.1849@nuc-kabylake>
Date:   Tue, 8 May 2018 07:53:21 -0500 (CDT)
From:   Christopher Lameter <cl@...ux.com>
To:     "prakash.sangappa" <prakash.sangappa@...cle.com>
cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-api@...r.kernel.org, akpm@...ux-foundation.org,
        mhocko@...e.com, kirill.shutemov@...ux.intel.com,
        n-horiguchi@...jp.nec.com, drepper@...il.com, rientjes@...gle.com
Subject: Re: [RFC PATCH] Add /proc/<pid>/numa_vamaps for numa node
 information

On Mon, 7 May 2018, prakash.sangappa wrote:

> > each address for each page? Length of the VMA segment?
> > Physical address?
>
> Need numa node information for each virtual address with pages mapped.
> No need of physical address.

You need per page information? Note that there can only be one page
per virtual address. Or are we talking about address ranges?

https://www.kernel.org/doc/Documentation/vm/pagemap.txt ?

Also the move_pages syscall has the ability to determine the location of
individual pages.