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

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Message-ID: <20141024075423.GA24479@gmail.com>
Date:	Fri, 24 Oct 2014 09:54:23 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	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, dave@...olabs.net,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 0/6] Another go at speculative page faults


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Thu, Oct 23, 2014 at 06:40:05PM +0800, Lai Jiangshan wrote:
> > On 10/22/2014 01:56 AM, Peter Zijlstra wrote:
> > > 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... :/
> > 
> > Maybe it is blamed to find_vma_srcu() that it doesn't take the advantage of
> > the vmacache_find() and cause more cache-misses.
> 
> Its what I thought initially, I tried doing perf record with and
> without, but then I ran into perf diff not quite working for me and I've
> yet to find time to kick that thing into shape.

Might be the 'perf diff' regression fixed by this:

  9ab1f50876db perf diff: Add missing hists__init() call at tool start

I just pushed it out into tip:master.

Thanks,

	Ingo
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