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

[Ingo Molnar]

* Peter Zijlstra <peterz@xxxxxxxxxxxxx> 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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