linux-kernel - Re: [GIT PULL||RFC 00/11] perf library and regression testing improvements

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Date:	Tue, 4 Jan 2011 12:34:00 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Han Pingtian <phan@...hat.com>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>, mingo@...e.hu
Subject: Re: [GIT PULL||RFC 00/11] perf library and regression testing
 improvements

Em Tue, Jan 04, 2011 at 03:29:59PM +0100, Stephane Eranian escreveu:
> Indeed counts is bogus:
> 
> ./perf stat -i -e cycles date
> 
> evt:0x7d4250 counts=0x7d4450 <-- from perf_evsel__alloc_counts()
> 
> Tue Jan  4 15:28:36 CET 2011
> 
> counter=0x7d4250 counts=(nil) <-- from read_counter_aggr()
> 
> Segmentation fault

Strange I'm not reproducing it here (printf just on read_counter_aggr):

[acme@...icio linux]$ perf stat date
Tue Jan  4 12:32:15 BRST 2011
0x2586820: 0x2586948
0x2586790: 0x25869f8
0x2586700: 0x2586aa8
0x2586670: 0x2586b58
0x25865e0: 0x2586c08
0x2586550: 0x2586cb8
0x25864c0: 0x2586d68
0x2586430: 0x2586e18
0x25863a0: 0x2586ec8
0x2586310: 0x2586f78

 Performance counter stats for 'date':

             7,512 cache-misses             #     13.010 M/sec
           342,645 cache-references         #    593.445 M/sec
            14,884 branch-misses            #      8.241 %    
           180,611 branches                 #    312.810 M/sec
           925,986 instructions             #      0.000 IPC    (scaled from 49.88%)
     <not counted> cycles                  
               201 page-faults              #      0.348 M/sec
                 0 CPU-migrations           #      0.000 M/sec
                 0 context-switches         #      0.000 M/sec
          0.577383 task-clock-msecs         #      0.588 CPUs 

        0.000982448  seconds time elapsed

[acme@...icio linux]$

[acme@...icio linux]$ gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.5.1/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,lto --enable-plugin --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-ppl --with-cloog --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.5.1 20100924 (Red Hat 4.5.1-4) (GCC) 
[acme@...icio linux]$

[acme@...icio linux]$ uname -a
Linux felicio.ghostprotocols.net 2.6.35.10-72.fc14.x86_64 #1 SMP Mon Dec 20 21:14:22 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux
[acme@...icio linux]$

[acme@...icio linux]$ cat /etc/fedora-release 
Fedora release 14 (Laughlin)
[acme@...icio linux]$

- Arnaldo
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