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Adrian Hunter 55052ac61c perf intel-pt: Fix duplicate branch after CBR 
commit a58a057ce6 upstream.

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: 91de8684f1 ("perf intel-pt: Cater for CBR change in PSB+")
Fixes: abe5a1d3e4 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-08-21 13:05:29 +02:00
..
arch perf tools: Fix record failure when mixed with ARM SPE event 2020-08-05 09:59:49 +02:00
bench perf bench: Share some global variables to fix build with gcc 10 2020-08-05 09:59:52 +02:00
Documentation perf docs: Correct and clarify jitdump spec 2019-09-30 17:29:51 -03:00
examples/bpf
include/bpf
jvmti perf jvmti: Link against tools/lib/ctype.h to have weak strlcpy() 2019-10-15 11:47:38 -03:00
lib libperf: Add perf_evlist__poll() function 2019-09-25 09:51:49 -03:00
pmu-events perf vendor events s390: Remove name from L1D_RO_EXCL_WRITES description 2020-01-17 19:48:30 +01:00
python
scripts perf scripts python: exported-sql-viewer.py: Fix unexpanded 'Find' result 2020-07-16 08:16:47 +02:00
tests perf tests bp_account: Make global variable static 2020-08-05 09:59:52 +02:00
trace
ui perf report TUI: Fix segmentation fault in perf_evsel__hists_browse() 2020-07-16 08:16:38 +02:00
util perf intel-pt: Fix duplicate branch after CBR 2020-08-21 13:05:29 +02:00
.gitignore
Build
builtin-annotate.c perf session: Return error code for perf_session__new() function on failure 2019-09-20 15:58:11 -03:00
builtin-bench.c
builtin-buildid-cache.c perf session: Return error code for perf_session__new() function on failure 2019-09-20 15:58:11 -03:00
builtin-buildid-list.c perf session: Return error code for perf_session__new() function on failure 2019-09-20 15:58:11 -03:00
builtin-c2c.c perf c2c: Fix return type for histogram sorting comparision functions 2020-02-05 21:22:40 +00:00
builtin-config.c perf tools: Remove util.h from where it is not needed 2019-09-20 09:19:20 -03:00
builtin-data.c
builtin-diff.c perf diff: Use llabs() with 64-bit values 2020-01-04 19:18:26 +01:00
builtin-evlist.c perf evsel: Introduce evsel_fprintf.h 2019-09-25 16:26:34 -03:00
builtin-ftrace.c
builtin-help.c
builtin-inject.c perf session: Return error code for perf_session__new() function on failure 2019-09-20 15:58:11 -03:00
builtin-kallsyms.c
builtin-kmem.c perf kmem: Fix memory leak in compact_gfp_flags() 2019-10-16 10:08:32 -03:00
builtin-kvm.c perf tools: Propagate get_cpuid() error 2019-09-30 17:29:54 -03:00
builtin-list.c perf list: Allow plurals for metric, metricgroup 2019-09-25 09:51:42 -03:00
builtin-lock.c perf session: Return error code for perf_session__new() function on failure 2019-09-20 15:58:11 -03:00
builtin-mem.c perf session: Return error code for perf_session__new() function on failure 2019-09-20 15:58:11 -03:00
builtin-probe.c perf probe: Do not show the skipped events 2020-06-22 09:31:27 +02:00
builtin-record.c libperf: Add perf_evlist__poll() function 2019-09-25 09:51:49 -03:00
builtin-report.c perf report: Fix NULL pointer dereference in hists__fprintf_nr_sample_events() 2020-06-24 17:50:45 +02:00
builtin-sched.c perf evsel: Introduce evsel_fprintf.h 2019-09-25 16:26:34 -03:00
builtin-script.c perf script: Fix --reltime with --time 2020-01-23 08:23:01 +01:00
builtin-stat.c libperf: Move 'sample_id' from 'struct evsel' to 'struct perf_evsel' 2019-09-25 09:51:47 -03:00
builtin-timechart.c perf session: Return error code for perf_session__new() function on failure 2019-09-20 15:58:11 -03:00
builtin-top.c perf evsel: Move config terms to a separate header 2019-09-25 16:26:40 -03:00
builtin-trace.c perf evsel: Introduce evsel_fprintf.h 2019-09-25 16:26:34 -03:00
builtin-version.c
builtin.h
check-headers.sh tools headers uapi: Sync linux/fs.h with the kernel sources 2019-09-30 17:29:22 -03:00
command-list.txt
CREDITS
design.txt
Makefile tools: Let O= makes handle a relative path with -C option 2020-04-01 11:02:00 +02:00
Makefile.config perf tools: Support Python 3.8+ in Makefile 2020-04-17 10:50:21 +02:00
Makefile.perf libtraceevent: Move traceevent plugins in its own subdirectory 2019-09-25 09:51:43 -03:00
MANIFEST
perf-archive.sh
perf-completion.sh
perf-read-vdso.c
perf-sys.h perf tools: Make usage of test_attr__* optional for perf-sys.h 2019-10-31 21:38:41 +01:00
perf-with-kcore.sh
perf.c libperf: Merge libperf_set_print() into libperf_init() 2019-09-25 09:51:49 -03:00
perf.h