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

Arnaldo Carvalho de Melo
2011-01-04T14:34:19Z

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@felicio 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@felicio linux]$

[acme@felicio 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@felicio linux]$

[acme@felicio 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@felicio linux]$

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

- Arnaldo