linux-kernel - Re: [RFC v4 00/20] Speculative page faults

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Message-Id: <98b890bc-10f7-d049-22a4-fe18c712af8d@linux.vnet.ibm.com>
Date:   Tue, 13 Jun 2017 12:19:57 +0200
From:   Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To:     Tim Chen <tim.c.chen@...ux.intel.com>,
        Michal Hocko <mhocko@...nel.org>
Cc:     paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
        akpm@...ux-foundation.org, kirill@...temov.name,
        ak@...ux.intel.com, dave@...olabs.net, jack@...e.cz,
        Matthew Wilcox <willy@...radead.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        haren@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com,
        npiggin@...il.com, bsingharora@...il.com
Subject: Re: [RFC v4 00/20] Speculative page faults

On 09/06/2017 18:59, Tim Chen wrote:
> On 06/09/2017 09:35 AM, Michal Hocko wrote:
>> On Fri 09-06-17 17:25:51, Laurent Dufour wrote:
>> [...]
>>> Thanks Michal for your feedback.
>>>
>>> I mostly focused on this database workload since this is the one where
>>> we hit the mmap_sem bottleneck when running on big node. On my usual
>>> victim node, I checked for basic usage like kernel build time, but I
>>> agree that's clearly not enough.
>>>
>>> I try to find details about the 'kbench' you mentioned, but I didn't get
>>> any valid entry.
>>> Would you please point me on this or any other bench tool you think will
>>> be useful here ?
>>
>> Sorry I meant kernbech (aka parallel kernel build). Other highly threaded
>> workloads doing a lot of page faults and address space modification
>> would be good to see as well. I wish I could give you much more
>> comprehensive list but I am not very good at benchmarks.
>>
> 
> Laurent,
> 
> Have you tried running the multi-fault microbenchmark by Kamezawa?
> It does threaded page faults in parallel.
> Peter ran that when he posted his specualtive page faults patches.
> https://lkml.org/lkml/2010/1/6/28


Thanks Tim to remind me about this, I downloaded and built it a time ago
and forget about it. I'll give it another try !