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442ad2254a
linux/tools/perf
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Adrian Hunter 442ad2254a perf record: Fix duplicated sideband events with Intel PT system wide tracing 
Commit 0a892c1c94 ("perf record: Add dummy event during system wide
synthesis") reveals an issue with Intel PT system wide tracing.
Specifically that Intel PT already adds a dummy tracking event, and it
is not the first event.  Adding another dummy tracking event causes
duplicated sideband events.  Fix by checking for an existing dummy
tracking event first.

Example showing duplicated switch events:

 Before:

   # perf record -a -e intel_pt//u uname
   Linux
   [ perf record: Woken up 1 times to write data ]
   [ perf record: Captured and wrote 0.895 MB perf.data ]
   # perf script --no-itrace --show-switch-events | head
            swapper     0 [007]  6390.516222: PERF_RECORD_SWITCH_CPU_WIDE OUT preempt  next pid/tid:    11/11
            swapper     0 [007]  6390.516222: PERF_RECORD_SWITCH_CPU_WIDE OUT preempt  next pid/tid:    11/11
          rcu_sched    11 [007]  6390.516223: PERF_RECORD_SWITCH_CPU_WIDE IN           prev pid/tid:     0/0
          rcu_sched    11 [007]  6390.516224: PERF_RECORD_SWITCH_CPU_WIDE IN           prev pid/tid:     0/0
          rcu_sched    11 [007]  6390.516227: PERF_RECORD_SWITCH_CPU_WIDE OUT          next pid/tid:     0/0
          rcu_sched    11 [007]  6390.516227: PERF_RECORD_SWITCH_CPU_WIDE OUT          next pid/tid:     0/0
            swapper     0 [007]  6390.516228: PERF_RECORD_SWITCH_CPU_WIDE IN           prev pid/tid:    11/11
            swapper     0 [007]  6390.516228: PERF_RECORD_SWITCH_CPU_WIDE IN           prev pid/tid:    11/11
            swapper     0 [002]  6390.516415: PERF_RECORD_SWITCH_CPU_WIDE OUT preempt  next pid/tid:  5556/5559
            swapper     0 [002]  6390.516416: PERF_RECORD_SWITCH_CPU_WIDE OUT preempt  next pid/tid:  5556/5559

 After:

   # perf record -a -e intel_pt//u uname
   Linux
   [ perf record: Woken up 1 times to write data ]
   [ perf record: Captured and wrote 0.868 MB perf.data ]
   #  perf script --no-itrace --show-switch-events | head
            swapper     0 [005]  6450.567013: PERF_RECORD_SWITCH_CPU_WIDE OUT preempt  next pid/tid:  7179/7181
               perf  7181 [005]  6450.567014: PERF_RECORD_SWITCH_CPU_WIDE IN           prev pid/tid:     0/0
               perf  7181 [005]  6450.567028: PERF_RECORD_SWITCH_CPU_WIDE OUT          next pid/tid:     0/0
            swapper     0 [005]  6450.567029: PERF_RECORD_SWITCH_CPU_WIDE IN           prev pid/tid:  7179/7181
            swapper     0 [005]  6450.571699: PERF_RECORD_SWITCH_CPU_WIDE OUT preempt  next pid/tid:    11/11
          rcu_sched    11 [005]  6450.571700: PERF_RECORD_SWITCH_CPU_WIDE IN           prev pid/tid:     0/0
          rcu_sched    11 [005]  6450.571702: PERF_RECORD_SWITCH_CPU_WIDE OUT          next pid/tid:     0/0
            swapper     0 [005]  6450.571703: PERF_RECORD_SWITCH_CPU_WIDE IN           prev pid/tid:    11/11
            swapper     0 [005]  6450.579703: PERF_RECORD_SWITCH_CPU_WIDE OUT preempt  next pid/tid:    11/11
          rcu_sched    11 [005]  6450.579704: PERF_RECORD_SWITCH_CPU_WIDE IN           prev pid/tid:     0/0

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20200629091955.17090-3-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2020-07-03 08:16:51 -03:00
..
arch tools headers API: Update faccessat2 affected files 2020-06-09 12:40:03 -03:00
bench perf tools: Replace zero-length array with flexible-array 2020-05-28 10:03:27 -03:00
Documentation perf auxtrace: Add four itrace options 2020-06-01 12:24:23 -03:00
examples/bpf Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-01-28 16:02:33 -08:00
include/bpf perf bpf: Remove bpf/ subdir from bpf.h headers used to build bpf events 2020-02-18 10:13:28 -03:00
jvmti perf jvmti: Remove redundant jitdump line table entries 2020-05-29 16:51:38 -03:00
pmu-events perf tools: Correct license on jsmn JSON parser 2020-05-29 16:51:38 -03:00
python treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 407 2019-06-05 17:37:14 +02:00
scripts perf scripts python: export-to-postgresql.py: Fix struct.pack() int argument 2020-07-03 08:15:02 -03:00
tests perf test: Initialize memory in dwarf-unwind 2020-06-01 12:24:23 -03:00
trace perf beauty: Add support to STATX_MNT_ID in the 'statx' syscall 'mask' argument 2020-06-09 12:40:03 -03:00
ui perf evsel: Rename perf_evsel__group_idx() to evsel__group_idx() 2020-05-05 16:35:31 -03:00
util perf record: Fix duplicated sideband events with Intel PT system wide tracing 2020-07-03 08:16:51 -03:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Build
builtin-annotate.c perf evsel: Rename perf_evsel__resort*() to evsel__resort*() 2020-05-28 10:03:24 -03:00
builtin-bench.c tools feature: Rename HAVE_EVENTFD to HAVE_EVENTFD_SUPPORT 2020-05-28 10:03:26 -03:00
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 'perf c2c record -e list' to show the default events used 2020-05-28 10:03:25 -03:00
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 perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00
builtin-diff.c perf evsel: Rename perf_evsel__is_*() to evsel__is*() 2020-05-05 16:35:31 -03:00
builtin-evlist.c perf evsel: Rename perf_evsel__fprintf() to evsel__fprintf() 2020-05-28 10:03:24 -03:00
builtin-ftrace.c perf ftrace: Detect workload failure 2020-05-28 10:03:27 -03:00
builtin-help.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00
builtin-inject.c perf tools: Replace zero-length array with flexible-array 2020-05-28 10:03:27 -03:00
builtin-kallsyms.c perf dsos: Move the dsos struct and its methods to separate source files 2019-08-31 22:24:10 -03:00
builtin-kmem.c perf kmem: Rename perf_evsel__*() operating on 'struct evsel *' to evsel__*() 2020-05-05 16:35:31 -03:00
builtin-kvm.c perf evsel: Rename perf_evsel__{str,int}val() and other tracepoint field metehods to to evsel__*() 2020-05-05 16:35:30 -03:00
builtin-list.c perf list: Add metrics to command line usage 2020-05-28 10:03:28 -03:00
builtin-lock.c perf lock: Rename perf_evsel__*() operating on 'struct evsel *' to evsel__*() 2020-05-05 16:35:31 -03:00
builtin-mem.c perf c2c: Fix 'perf c2c record -e list' to show the default events used 2020-05-28 10:03:25 -03:00
builtin-probe.c perf probe: Do not show the skipped events 2020-05-28 10:03:24 -03:00
builtin-record.c perf record: Fix duplicated sideband events with Intel PT system wide tracing 2020-07-03 08:16:51 -03:00
builtin-report.c perf report: Fix NULL pointer dereference in hists__fprintf_nr_sample_events() 2020-06-09 12:40:04 -03:00
builtin-sched.c perf sched: Rename perf_evsel__*() operating on 'struct evsel *' to evsel__*() 2020-05-05 16:35:31 -03:00
builtin-script.c perf script: Initialize zstd_data 2020-06-17 13:19:37 -03:00
builtin-stat.c perf stat: Ensure group is defined on top of the same cpu mask 2020-06-02 10:43:06 -03:00
builtin-timechart.c perf tools: Replace zero-length array with flexible-array 2020-05-28 10:03:27 -03:00
builtin-top.c perf tools: Add optional support for libpfm4 2020-05-29 16:51:38 -03:00
builtin-trace.c perf trace: Grow the syscall table as needed when using libaudit 2020-05-29 16:51:11 -03:00
builtin-version.c perf symbols: Move mem_info and branch_info out of symbol.h 2019-08-31 22:27:48 -03:00
builtin.h perf tools: Remove needless util.h include from builtin.h 2019-08-28 17:19:34 -03:00
check-headers.sh perf tools: Grab a copy of libbpf's hashmap 2020-05-28 10:03:26 -03:00
command-list.txt
CREDITS
design.txt perf tools: Support CAP_PERFMON capability 2020-04-16 12:19:08 -03:00
Makefile tools: Let O= makes handle a relative path with -C option 2020-03-06 17:08:28 -03:00
Makefile.config perf build: Fix error message when asking for -fsanitize=address without required libraries 2020-06-18 10:34:31 -03:00
Makefile.perf perf tools: Add optional support for libpfm4 2020-05-29 16:51:38 -03:00
MANIFEST libperf: Move to tools/lib/perf 2020-01-06 11:46:09 -03:00
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 Merge branch 'x86/cpu' into perf/core, to pick up dependent changes 2019-06-17 12:29:16 +02:00
perf.c libperf: Merge libperf_set_print() into libperf_init() 2019-09-25 09:51:49 -03:00
perf.h perf time-utils: Adopt rdclock() from perf.h 2019-08-29 17:38:32 -03:00