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Stephane Eranian db49a71798 perf stat: Fix bug in handling events in error state 
(This is a patch has been sitting in the Intel CQM/CMT driver series for
 a while, despite not depend on it. Sending it now independently since
 the series is being discarded.)

When an event is in error state, read() returns 0 instead of sizeof()
buffer. In certain modes, such as interval printing, ignoring the 0
return value may cause bogus count deltas to be computed and thus
invalid results printed.

This patch fixes this problem by modifying read_counters() to mark the
event as not scaled (scaled = -1) to force the printout routine to show
<NOT COUNTED>.

Signed-off-by: Stephane Eranian <eranian@google.com>
Reviewed-by: David Carrillo-Cisneros <davidcc@google.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/20170412182301.44406-1-davidcc@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2017-04-13 10:40:36 -03:00
..
arch perf annotate s390: Implement jump types for perf annotate 2017-04-11 15:23:40 -03:00
bench perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
Documentation perf tools: Describe pipe mode in perf.data-file-fomat.txt 2017-04-11 15:23:41 -03:00
jvmti
pmu-events perf vendor events intel: Add missing space in json descriptions 2017-03-30 13:35:50 -07:00
python
scripts
tests perf tests: Do not assume that readlink() returns a null terminated string 2017-03-27 15:35:56 -03:00
trace perf trace: Beautify statx syscall 'flag' and 'mask' arguments 2017-03-31 14:42:31 -03:00
ui perf ui browser: Refactor the code to parse color configs with ltrim() 2017-04-11 08:45:10 -03:00
util perf stat: Fix bug in handling events in error state 2017-04-13 10:40:36 -03:00
.gitignore perf tools: Ignore generated files pmu-events/{jevents,pmu-events.c} for git 2017-03-13 10:59:36 -03:00
Build perf trace: Beautify statx syscall 'flag' and 'mask' arguments 2017-03-31 14:42:31 -03:00
builtin-annotate.c perf annotate: Process attr and build_id records 2017-04-11 15:23:42 -03:00
builtin-bench.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-buildid-cache.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-buildid-list.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-c2c.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-config.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-data.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-diff.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-evlist.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-ftrace.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-help.c perf tools: Remove support for command aliases 2017-03-28 11:19:59 -03:00
builtin-inject.c perf inject: Don't proceed if perf_session__process_event() fails 2017-04-11 15:23:40 -03:00
builtin-kallsyms.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-kmem.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-kvm.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-list.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-lock.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-mem.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-probe.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-record.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-report.c perf report: Introduce --inline option 2017-03-27 12:01:46 -03:00
builtin-sched.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-script.c perf script: Use strtok_r() when parsing output field list 2017-04-11 08:45:09 -03:00
builtin-stat.c perf stat: Fix bug in handling events in error state 2017-04-13 10:40:36 -03:00
builtin-timechart.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-top.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin-trace.c perf trace: Beautify statx syscall 'flag' and 'mask' arguments 2017-03-31 14:42:31 -03:00
builtin-version.c perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
builtin.h perf tools: Remove unused 'prefix' from builtin functions 2017-03-27 11:58:09 -03:00
check-headers.sh tools include uapi: Grab copies of stat.h and fcntl.h 2017-03-31 11:26:03 -03:00
command-list.txt perf tools: Missing c2c command in command-list 2017-03-13 10:59:31 -03:00
CREDITS
design.txt
Makefile
Makefile.config perf tools: Pass PYTHON config to feature detection 2017-04-12 10:45:21 -03:00
Makefile.perf perf build: Add special fixdep cleaning rule 2017-02-17 16:04:38 -03:00
MANIFEST tools include uapi: Grab copies of stat.h and fcntl.h 2017-03-31 11:26:03 -03:00
perf-archive.sh
perf-completion.sh
perf-read-vdso.c
perf-sys.h
perf-with-kcore.sh
perf.c perf tools: Remove die() call 2017-04-04 11:36:22 -03:00
perf.h perf tools: Add PERF_RECORD_NAMESPACES to include namespaces related info 2017-03-14 11:38:23 -03:00