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

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Message-ID: <20170609163520.GB9332@dhcp22.suse.cz>
Date:   Fri, 9 Jun 2017 18:35:21 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Laurent Dufour <ldufour@...ux.vnet.ibm.com>
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 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.

-- 
Michal Hocko
SUSE Labs