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

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Message-ID: <addeaadc-5ab2-f0c9-2194-dd100ae90f3a@oracle.com>
Date:   Mon, 7 May 2018 18:16:13 -0700
From:   "prakash.sangappa" <prakash.sangappa@...cle.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-api@...r.kernel.org, mhocko@...e.com,
        kirill.shutemov@...ux.intel.com, n-horiguchi@...jp.nec.com,
        drepper@...il.com, rientjes@...gle.com,
        Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [RFC PATCH] Add /proc/<pid>/numa_vamaps for numa node information



On 05/07/2018 05:05 PM, Dave Hansen wrote:
> On 05/07/2018 04:22 PM, prakash.sangappa wrote:
>> However, with the proposed new file, we could allow seeking to
>> specified virtual address. The lseek offset in this case would
>> represent the virtual address of the process. Subsequent read from
>> the file would provide VA range to numa node information starting
>> from that VA. In case the VA seek'ed to is invalid, it will start
>> from the next valid mapped VA of the process. The implementation
>> would not be based on seq_file.
> So you're proposing a new /proc/<pid> file that appears next to and is
> named very similarly to the exiting /proc/<pid>, but which has entirely
> different behavior?

It will be /proc/<pid>/numa_vamaps. Yes, the behavior will be
different with respect to seeking. Output will still be text and
the format will be same.

I want to get feedback on this approach.