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From: Laurent Dufour <ldufour@linux.vnet.ibm.com>
To: Thomas Gleixner <tglx@linutronix.de>
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>
Subject: Re: Plumbers 2018 - Performance and Scalability Microconference
Date: Thu, 6 Sep 2018 09:45:05 +0200	[thread overview]
Message-ID: <4d6a466c-6f77-b54e-fb30-9ad8e5bb4023@linux.vnet.ibm.com> (raw)
In-Reply-To: <alpine.DEB.2.21.1809060059390.1416@nanos.tec.linutronix.de>

On 06/09/2018 01:01, Thomas Gleixner wrote:
> 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?

I agree, at one time the page tables would have to be manipulated, and this is
mostly done under the protection of the page table locks - should the mmap_sem
still being held then ?

I was thinking about all the processing done on the VMAs, accounting, etc.
That part, usually not manipulating the page tables, is less dependent of the
underlying page size.

But I agree at one time of the processing, the page table are manipulated and
dealing with larger pages is better then.

Thanks,
Laurent.


  reply	other threads:[~2018-09-06  7:45 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-04 21:28 Plumbers 2018 - Performance and Scalability Microconference Daniel Jordan
2018-09-04 21:28 ` Daniel Jordan
2018-09-05  6:38 ` Mike Rapoport
2018-09-05 19:51   ` Pasha Tatashin
2018-09-06  5:49     ` Mike Rapoport
2018-09-05 15:10 ` Christopher Lameter
2018-09-05 15:10   ` Christopher Lameter
2018-09-05 16:17   ` Laurent Dufour
2018-09-05 17:11     ` Christopher Lameter
2018-09-05 23:01     ` Thomas Gleixner
2018-09-06  7:45       ` Laurent Dufour [this message]
2018-09-06  1:58   ` Huang, Ying
2018-09-06  1:58     ` Huang, Ying
2018-09-06 14:41     ` Christopher Lameter
2018-09-07  2:17       ` Huang, Ying
2018-09-07  2:17         ` Huang, Ying
2018-09-06 21:36     ` Mike Kravetz
2018-09-07  0:52       ` Hugh Dickins
2018-09-08  4:13 ` John Hubbard
2018-09-08  4:13   ` John Hubbard
2018-09-10 17:09   ` Waiman Long
2018-09-10 17:20     ` Davidlohr Bueso
2018-09-10 17:34       ` John Hubbard
2018-09-10 17:34         ` John Hubbard
2018-09-11  0:29         ` Daniel Jordan
2018-09-11  0:29           ` Daniel Jordan
2018-09-11 13:52           ` Waiman Long
2018-09-11  0:38   ` Daniel Jordan

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