linux-kernel - Re: [PATCH 1/4] perf stat: Basic support for TopDown in perf stat

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Date:	Mon, 6 Jun 2016 11:00:03 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Jiri Olsa <jolsa@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] perf stat: Basic support for TopDown in perf stat

Em Mon, May 30, 2016 at 01:19:42PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, May 30, 2016 at 09:04:02AM -0700, Andi Kleen escreveu:
> > > Which is a Broadwell-U, dual-core, 14 nm.
> > > 
> > > [root@...et linux]# echo 0 > /proc/sys/kernel/nmi_watchdog
> > > [root@...et linux]# perf stat --topdown -a usleep 1
> > > System does not support topdown
> > > [root@...et linux]# cat /proc/sys/kernel/nmi_watchdog
> > > 0
> > > [root@...et linux]#
> > > 
> > > Please advise.
> > 
> > You don't have the kernel patches?
> > 
> > They're in PeterZ's tree, but not yet in tip
> > https://git.kernel.org/cgit/linux/kernel/git/peterz/queue.git/log/?h=perf/core
> 
> oops, will try applying those patches, thanks for claryfing.

The kernel patches are in tip/perf/core now, so I applied the patches
and they seem to work, but they broke one 'perf test' entry:

# perf test 5
 5: parse events tests                                       : FAILED!

# perf test -v 5
<SNIP>
running test 50 '4:0x6530160/name=numpmu/'
running test 51 'L1-dcache-misses/name=cachepmu/'
running test 0 'cpu/config=10,config1,config2=3,period=1000/u'
running test 1 'cpu/config=1,name=krava/u,cpu/config=2/u'
running test 2 'cpu/config=1,call-graph=fp,time,period=100000/,cpu/config=2,call-graph=no,time=0,period=2000/'
Invalid sysfs entry event=topdown-recovery-bubbles.scale
failed to parse event 'cpu/event=topdown-recovery-bubbles.scale/u', err 1
test child finished with 1
---- end ----
parse events tests: FAILED!
#

Please check that,

- Arnaldo