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

[Namhyung Kim]

Hi Peter,

On Fri, 24 Oct 2014 15:14:40 +0200, Peter Zijlstra wrote:
> On Fri, Oct 24, 2014 at 09:54:23AM +0200, Ingo Molnar wrote:
>> 
>> * Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>> > 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.
>
> I was on tip/master, so unlikely to be that as I was likely already
> having it.
>
> perf-report was affected too, for some reason my CONFIG_DEBUG_INFO=y
> vmlinux wasn't showing symbols (and I double checked that KASLR crap was
> disabled, so that wasn't confusing stuff either).
>
> When I forced perf-report to use kallsyms it works, however perf-diff
> doesn't have that option.
>
> So there's two issues there, 1) perf-report failing to generate useful
> output and 2) per-diff lacking options to force it to behave.

Did the perf-report fail to show any (kernel) symbols or are they wrong
symbols?  Maybe it's related to this:

https://lkml.org/lkml/2014/9/22/78

Thanks,
Namhyung
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