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

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Message-ID: <a61bc7b6-ed98-045d-95c0-b6c91fc8d1da@oracle.com>
Date:   Mon, 7 May 2018 15:50:30 -0700
From:   "prakash.sangappa" <prakash.sangappa@...cle.com>
To:     Christopher Lameter <cl@...ux.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 05/07/2018 07:47 AM, Christopher Lameter wrote:
> On Fri, 4 May 2018, Prakash Sangappa wrote:
>> Currently 'numa_maps' gives a list of numa nodes, memory is allocated per
>> VMA.
>> Ex. we get something like from numa_maps.
>>
>> 04000  N0=1,N2=2 kernelpagesize_KB=4
>>
>> First is the start address of a VMA. This VMA could be much larger then 3 4k
>> pages.
>> It does not say which address in the VMA has the pages mapped.
> Not precise. First the address is there as you already said. That is the
> virtual address of the beginning of the VMA. What is missing? You need

Yes,

> 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.