From: Andrew Morton <akpm@linux-foundation.org>
To: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
kirill@shutemov.name, Andi Kleen <ak@linux.intel.com>,
Michal Hocko <mhocko@kernel.org>,
dave@stgolabs.net, Jan Kara <jack@suse.cz>,
Matthew Wilcox <willy@infradead.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Paul Mackerras <paulus@samba.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Will Deacon <will.deacon@arm.com>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
haren@linux.vnet.ibm.com,
Anshuman Khandual <khandual@linux.vnet.ibm.com>,
npiggin@gmail.com, bsingharora@gmail.com,
Tim Chen <tim.c.chen@linux.intel.com>,
linuxppc-dev@lists.ozlabs.org, "x86@kernel.org" <x86@kernel.org>
Subject: Re: [PATCH v3 00/20] Speculative page faults
Date: Thu, 28 Sep 2017 13:38:50 -0700 [thread overview]
Message-ID: <20170928133850.90c5bf2aac0f1a63e29c01a3@linux-foundation.org> (raw)
In-Reply-To: <924a79af-6d7a-316a-1eee-3aebbfd4addf@linux.vnet.ibm.com>
On Thu, 28 Sep 2017 14:29:02 +0200 Laurent Dufour <ldufour@linux.vnet.ibm.com> wrote:
> > Laurent's [0/n] provides some nice-looking performance benefits for
> > workloads which are chosen to show performance benefits(!) but, alas,
> > no quantitative testing results for workloads which we may suspect will
> > be harmed by the changes(?). Even things as simple as impact upon
> > single-threaded pagefault-intensive workloads and its effect upon
> > CONFIG_SMP=n .text size?
>
> I forgot to mention in my previous email the impact on the .text section.
>
> Here are the metrics I got :
>
> .text size UP SMP Delta
> 4.13-mmotm 8444201 8964137 6.16%
> '' +spf 8452041 8971929 6.15%
> Delta 0.09% 0.09%
>
> No major impact as you could see.
8k text increase seems rather a lot actually. That's a lot more
userspace cacheclines that get evicted during a fault...
Is the feature actually beneficial on uniprocessor?
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next prev parent reply other threads:[~2017-09-28 20:38 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-25 16:27 Alexei Starovoitov
2017-09-25 23:34 ` Andrew Morton
2017-09-28 12:17 ` Laurent Dufour
2017-09-28 12:29 ` Laurent Dufour
2017-09-28 20:38 ` Andrew Morton [this message]
2017-09-29 15:27 ` Laurent Dufour
2017-10-03 1:27 ` Michael Ellerman
2017-10-03 8:03 ` Laurent Dufour
2017-09-26 8:30 ` Laurent Dufour
2017-10-04 6:50 ` Laurent Dufour
2017-10-05 23:32 ` Alexei Starovoitov
-- strict thread matches above, loose matches on Subject: below --
2017-09-08 18:06 Laurent Dufour
2017-09-18 7:15 ` Laurent Dufour
2017-09-08 17:32 Laurent Dufour
2017-09-08 17:44 ` Laurent Dufour
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