From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
To: Dave Hansen <dave.hansen@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Prakash Sangappa <prakash.sangappa@oracle.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-api@vger.kernel.org, mhocko@suse.com,
kirill.shutemov@linux.intel.com, n-horiguchi@ah.jp.nec.com,
drepper@gmail.com, rientjes@google.com,
Naoya Horiguchi <nao.horiguchi@gmail.com>
Subject: Re: [RFC PATCH] Add /proc/<pid>/numa_vamaps for numa node information
Date: Thu, 3 May 2018 14:16:02 +0530 [thread overview]
Message-ID: <33f96879-351f-674a-ca23-43f233f4eb1d@linux.vnet.ibm.com> (raw)
In-Reply-To: <2ce01d91-5fba-b1b7-2956-c8cc1853536d@intel.com>
On 05/03/2018 03:58 AM, Dave Hansen wrote:
> On 05/02/2018 02:33 PM, Andrew Morton wrote:
>> On Tue, 1 May 2018 22:58:06 -0700 Prakash Sangappa <prakash.sangappa@oracle.com> wrote:
>>> For analysis purpose it is useful to have numa node information
>>> corresponding mapped address ranges of the process. Currently
>>> /proc/<pid>/numa_maps provides list of numa nodes from where pages are
>>> allocated per VMA of the process. This is not useful if an user needs to
>>> determine which numa node the mapped pages are allocated from for a
>>> particular address range. It would have helped if the numa node information
>>> presented in /proc/<pid>/numa_maps was broken down by VA ranges showing the
>>> exact numa node from where the pages have been allocated.
>
> I'm finding myself a little lost in figuring out what this does. Today,
> numa_maps might us that a 3-page VMA has 1 page from Node 0 and 2 pages
> from Node 1. We group *entirely* by VMA:
>
> 1000-4000 N0=1 N1=2
>
> We don't want that. We want to tell exactly where each node's memory is
> despite if they are in the same VMA, like this:
>
> 1000-2000 N1=1
> 2000-3000 N0=1
> 3000-4000 N1=1
I am kind of wondering on a big memory system how many lines of output
we might have for a large (consuming lets say 80 % of system RAM) VMA
in interleave policy. Is not that a problem ?
next prev parent reply other threads:[~2018-05-03 8:46 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-02 5:58 [RFC PATCH] Add /proc/<pid>/numa_vamaps for numa node information Prakash Sangappa
2018-05-02 21:33 ` Andrew Morton
2018-05-02 22:28 ` Dave Hansen
2018-05-02 23:17 ` prakash.sangappa
2018-05-03 8:46 ` Anshuman Khandual [this message]
2018-05-03 22:27 ` prakash.sangappa
2018-05-03 22:26 ` Dave Hansen
2018-05-07 23:22 ` prakash.sangappa
2018-05-08 0:05 ` Dave Hansen
2018-05-08 1:16 ` prakash.sangappa
2018-05-09 23:31 ` Dave Hansen
2018-09-12 20:42 ` prakash.sangappa
2018-09-12 20:57 ` prakash.sangappa
2018-09-14 1:33 ` Jann Horn
2018-09-14 6:21 ` Michal Hocko
2018-09-14 12:49 ` Jann Horn
2018-09-14 13:49 ` Michal Hocko
2018-09-14 18:07 ` Prakash Sangappa
2018-09-14 18:14 ` Jann Horn
2018-05-02 23:43 ` prakash.sangappa
2018-05-03 8:57 ` Michal Hocko
2018-05-03 22:37 ` prakash.sangappa
2018-05-04 11:10 ` Michal Hocko
2018-05-03 18:03 ` Christopher Lameter
2018-05-03 22:39 ` prakash.sangappa
2018-05-04 11:12 ` Michal Hocko
2018-05-04 16:18 ` Prakash Sangappa
2018-05-10 7:42 ` Michal Hocko
2018-05-10 16:00 ` Prakash Sangappa
2018-05-11 6:39 ` Michal Hocko
2018-05-04 14:57 ` Christopher Lameter
2018-05-04 16:27 ` Prakash Sangappa
2018-05-07 14:47 ` Christopher Lameter
2018-05-07 22:50 ` prakash.sangappa
2018-05-08 12:53 ` Christopher Lameter
2018-09-12 23:02 Alexey Dobriyan
2018-09-13 22:17 ` prakash.sangappa
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