linux-kernel - Re: [PATCHv8 0/8] ftrace, perf: Adding support to use function trace

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Date:	Fri, 10 Feb 2012 17:07:56 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	fweisbec@...il.com, mingo@...hat.com, paulus@...ba.org,
	acme@...stprotocols.net, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org, aarapov@...hat.com
Subject: Re: [PATCHv8 0/8] ftrace, perf: Adding support to use function trace

On Fri, Feb 10, 2012 at 09:45:20AM -0500, Steven Rostedt wrote:
> On Fri, 2012-02-10 at 08:27 -0500, Steven Rostedt wrote:
> > On Tue, 2012-02-07 at 20:44 +0100, Jiri Olsa wrote:
> > > hi,
> > > here's another version of perf support for function trace
> > > with filter. 
> > 
> > OK, I've applied all of these and I'm now going to run them through my
> > test suite before sending them to Ingo. I'll let you know if anything
> > goes wrong.
> 
> OK, I build booted and installed a kernel with your patches. I also
> installed the latest perf code from linus/master. Then I ran the
> following:
> 
> # perf record -e ftrace:function ls
> 
> and then ran
> 
> # perf report
> 
> It went into an infinite loop of "Processing time ordered events".
> 
> Is this expected?
> 
> Although perf script works fine.

yep, I was using perf script for testing
I get the same error for perf report, also if you run it like:

[root@...p-26-214 perf]# ./perf report --stdio
Warning:
Processed 82392 events and lost 1 chunks!

Check IO/CPU overload!

# ========
# captured on: Fri Feb 10 19:15:37 2012
# hostname : dhcp-26-214.brq.redhat.com
# os release : 3.3.0-rc3+
# perf version : 3.3.rc3.1274.g135d69
# arch : x86_64
# nrcpus online : 2
# nrcpus avail : 2
# cpudesc : Intel(R) Core(TM)2 Duo CPU T9400 @ 2.53GHz
# cpuid : GenuineIntel,6,23,10
# total memory : 1969896 kB
# cmdline : /home/jolsa/tip/tools/perf/perf record -e ftrace:function ls 
# event : name = ftrace:function, type = 2, config = 0x1, config1 = 0x0,
# config2 = 0x0, excl_usr = 0, excl_kern = 0, id = { 3, 4 }
# HEADER_CPU_TOPOLOGY info available, use -I to display
# ========
#
Warning: Timestamp below last timeslice flush
# Events: 78K ftrace:function
#
# Overhead  Command      Shared Object                   Symbol
# ........  .......  .................  .......................
#
   100.00%       ls  [kernel.kallsyms]  [k] ftrace_ops_control_func

#
# (For a higher level overview, try: perf report --sort comm,dso)



I'll check whats going on, thanks
jirka
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