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authorAdrian Hunter <adrian.hunter@intel.com>2020-07-10 18:10:54 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2020-08-06 08:18:32 -0300
commita58a057ce65b52125dd355b7d8b0d540ea267a5f (patch)
tree62af8dc052610f8072ef15e8e53d0cf22c0793c5 /tools/perf/util
parent401136bb084fd021acd9f8c51b52fe0a25e326b2 (diff)
perf intel-pt: Fix duplicate branch after CBR
CBR events can result in a duplicate branch event, because the state type defaults to a branch. Fix by clearing the state type. Example: trace 'sleep' and hope for a frequency change Before: $ perf record -e intel_pt//u sleep 0.1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.034 MB perf.data ] $ perf script --itrace=bpe > before.txt After: $ perf script --itrace=bpe > after.txt $ diff -u before.txt after.txt --- before.txt 2020-07-07 14:42:18.191508098 +0300 +++ after.txt 2020-07-07 14:42:36.587891753 +0300 @@ -29673,7 +29673,6 @@ sleep 93431 [007] 15411.619905: 1 branches:u: 0 [unknown] ([unknown]) => 7f0818abb2e0 clock_nanosleep@@GLIBC_2.17+0x0 (/usr/lib/x86_64-linux-gnu/libc-2.31.so) sleep 93431 [007] 15411.619905: 1 branches:u: 7f0818abb30c clock_nanosleep@@GLIBC_2.17+0x2c (/usr/lib/x86_64-linux-gnu/libc-2.31.so) => 0 [unknown] ([unknown]) sleep 93431 [007] 15411.720069: cbr: cbr: 15 freq: 1507 MHz ( 56%) 7f0818abb30c clock_nanosleep@@GLIBC_2.17+0x2c (/usr/lib/x86_64-linux-gnu/libc-2.31.so) - sleep 93431 [007] 15411.720069: 1 branches:u: 7f0818abb30c clock_nanosleep@@GLIBC_2.17+0x2c (/usr/lib/x86_64-linux-gnu/libc-2.31.so) => 0 [unknown] ([unknown]) sleep 93431 [007] 15411.720076: 1 branches:u: 0 [unknown] ([unknown]) => 7f0818abb30e clock_nanosleep@@GLIBC_2.17+0x2e (/usr/lib/x86_64-linux-gnu/libc-2.31.so) sleep 93431 [007] 15411.720077: 1 branches:u: 7f0818abb323 clock_nanosleep@@GLIBC_2.17+0x43 (/usr/lib/x86_64-linux-gnu/libc-2.31.so) => 7f0818ac0eb7 __nanosleep+0x17 (/usr/lib/x86_64-linux-gnu/libc-2.31.so) sleep 93431 [007] 15411.720077: 1 branches:u: 7f0818ac0ebf __nanosleep+0x1f (/usr/lib/x86_64-linux-gnu/libc-2.31.so) => 55cb7e4c2827 rpl_nanosleep+0x97 (/usr/bin/sleep) Fixes: 91de8684f1cff ("perf intel-pt: Cater for CBR change in PSB+") Fixes: abe5a1d3e4bee ("perf intel-pt: Decoder to output CBR changes immediately") Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: stable@vger.kernel.org Link: http://lore.kernel.org/lkml/20200710151104.15137-3-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util')
-rw-r--r--tools/perf/util/intel-pt-decoder/intel-pt-decoder.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index 75c4bd74d521..7ffcbd6fcd1a 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1977,8 +1977,10 @@ next:
* possibility of another CBR change that gets caught up
* in the PSB+.
*/
- if (decoder->cbr != decoder->cbr_seen)
+ if (decoder->cbr != decoder->cbr_seen) {
+ decoder->state.type = 0;
return 0;
+ }
break;
case INTEL_PT_PIP:
@@ -2019,8 +2021,10 @@ next:
case INTEL_PT_CBR:
intel_pt_calc_cbr(decoder);
- if (decoder->cbr != decoder->cbr_seen)
+ if (decoder->cbr != decoder->cbr_seen) {
+ decoder->state.type = 0;
return 0;
+ }
break;
case INTEL_PT_MODE_EXEC: