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Date: Thu, 6 Sep 2018 01:01:09 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: Plumbers 2018 - Performance and Scalability Microconference
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To: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Cc: Christopher Lameter <cl@linux.com>, Daniel Jordan <daniel.m.jordan@oracle.com>, linux-kernel@vger.kernel.org, "linux-mm@kvack.org" <linux-mm@kvack.org>, Aaron Lu <aaron.lu@intel.com>, alex.kogan@oracle.com, akpm@linux-foundation.org, boqun.feng@gmail.com, brouer@redhat.com, dave@stgolabs.net, dave.dice@oracle.com, Dhaval Giani <dhaval.giani@oracle.com>, ktkhai@virtuozzo.com, Pavel.Tatashin@microsoft.com, paulmck@linux.vnet.ibm.com, shady.issa@oracle.com, tariqt@mellanox.com, tim.c.chen@intel.com, vbabka@suse.cz, longman@redhat.com, yang.shi@linux.alibaba.com, shy828301@gmail.com, Huang Ying <ying.huang@intel.com>, subhra.mazumdar@oracle.com, Steven Sistare <steven.sistare@oracle.com>, jwadams@google.com, ashwinch@google.com, sqazi@google.com, Shakeel Butt <shakeelb@google.com>, walken@google.com, rientjes@google.com, junaids@google.com, Neha Agarwal <nehaagarwal@google.com>

On Wed, 5 Sep 2018, Laurent Dufour wrote:
> On 05/09/2018 17:10, Christopher Lameter wrote:
> > Large page sizes also reduce contention there.
> 
> That's true for the page fault path, but for process's actions manipulating the
> memory process's layout (mmap,munmap,madvise,mprotect) the impact is minimal
> unless the code has to manipulate the page tables.

And how exactly are you going to do any of those operations _without_
manipulating the page tables?

Thanks,

	tglx