linux-kernel - Re: [RFC][PATCH 0/6] Another go at speculative page faults

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Message-ID: <20141021175603.GI3219@twins.programming.kicks-ass.net>
Date:	Tue, 21 Oct 2014 19:56:03 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Ingo Molnar <mingo@...nel.org>, torvalds@...ux-foundation.org,
	paulmck@...ux.vnet.ibm.com, tglx@...utronix.de,
	akpm@...ux-foundation.org, riel@...hat.com, mgorman@...e.de,
	oleg@...hat.com, mingo@...hat.com, minchan@...nel.org,
	kamezawa.hiroyu@...fujitsu.com, viro@...iv.linux.org.uk,
	laijs@...fujitsu.com, dave@...olabs.net,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 0/6] Another go at speculative page faults

On Tue, Oct 21, 2014 at 08:09:48PM +0300, Kirill A. Shutemov wrote:
> It would be interesting to see if the patchset affects non-condended case.
> Like a one-threaded workload.

It does, and not in a good way, I'll have to look at that... :/

 Performance counter stats for './multi-fault 1' (5 runs):

        73,860,251      page-faults                                                   ( +-  0.28% )
            40,914      cache-misses                                                  ( +- 41.26% )

      60.001484913 seconds time elapsed                                          ( +-  0.00% )


 Performance counter stats for './multi-fault 1' (5 runs):

        70,700,838      page-faults                                                   ( +-  0.03% )
            31,466      cache-misses                                                  ( +-  8.62% )

      60.001753906 seconds time elapsed                                          ( +-  0.00% )
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