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linux/tools/perf/tests
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Andi Kleen 4804e01116 perf stat: Use affinity for opening events 
Restructure the event opening in perf stat to cycle through the events
by CPU after setting affinity to that CPU.

This eliminates IPI overhead in the perf API.

We have to loop through the CPU in the outter builtin-stat code instead
of leaving that to low level functions.

It has to change the weak group fallback strategy slightly.  Since we
cannot easily undo the opens for other CPUs move the weak group retry to
a separate loop.

Before with a large test case with 94 CPUs:

  % time     seconds  usecs/call     calls    errors syscall
  ------ ----------- ----------- --------- --------- ----------------
   42.75    4.050910          67     60046       110 perf_event_open

After:

   26.86    0.944396          16     58069       110 perf_event_open

(the number changes slightly because the weak group retries
work differently and the test case relies on weak groups)

Committer notes:

Added one of the hunks in a patch provided by Andi after I noticed that
the "event times" 'perf test' entry was segfaulting.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lore.kernel.org/lkml/20191121001522.180827-10-andi@firstfloor.org
Link: http://lore.kernel.org/lkml/20191127232657.GL84886@tassilo.jf.intel.com # Fix
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2019-11-29 12:20:45 -03:00
..
attr perf tools: Add kernel AUX area sampling definitions 2019-11-21 10:54:20 -03:00
shell perf tests: Fixes hang in zstd compression test by changing the source of random data 2019-08-26 11:58:29 -03:00
.gitignore perf test: Add libbpf relocation checker 2016-01-26 12:10:55 -03:00
attr.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00
attr.py perf script python: Add Python3 support to tests/attr.py 2019-02-05 10:31:08 -03:00
backward-ring-buffer.c perf tests: Fix out of bounds memory access 2019-11-07 09:04:22 -03:00
bitmap.c perf env: Remove needless cpumap.h header 2019-09-20 09:19:21 -03:00
bp_account.c perf tests bp_account: Add dedicated checking helper is_supported() 2019-10-19 15:35:01 -03:00
bp_signal.c perf tests: Fix a typo 2019-11-06 15:43:05 -03:00
bp_signal_overflow.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00
bpf-script-example.c perf tests: Add missing SPDX headers 2019-06-17 15:57:19 -03:00
bpf-script-test-kbuild.c perf tests: Add missing SPDX headers 2019-06-17 15:57:19 -03:00
bpf-script-test-prologue.c perf tests: Add missing SPDX headers 2019-06-17 15:57:19 -03:00
bpf-script-test-relocation.c perf tests: Add missing SPDX headers 2019-06-17 15:57:19 -03:00
bpf.c libperf: Adopt perf_mmap__read_event() from tools/perf 2019-10-10 11:49:46 -03:00
Build perf tests: Rename tests/map_groups.c to tests/maps.c 2019-11-26 11:07:46 -03:00
builtin-test.c perf evlist: Maintain evlist->all_cpus 2019-11-29 12:20:45 -03:00
clang.c perf tools: Remove util.h from where it is not needed 2019-09-20 09:19:20 -03:00
code-reading.c perf thread: Rename thread->mg to thread->maps 2019-11-26 11:07:46 -03:00
cpumap.c perf evlist: Maintain evlist->all_cpus 2019-11-29 12:20:45 -03:00
dso-data.c perf tools: Remove util.h from where it is not needed 2019-09-20 09:19:20 -03:00
dwarf-unwind.c perf unwind: Use 'struct map_symbol' in 'struct unwind_entry' 2019-11-12 08:20:53 -03:00
event-times.c perf stat: Use affinity for opening events 2019-11-29 12:20:45 -03:00
event_update.c libperf: Add perf_evlist__id_add() function 2019-09-25 09:51:48 -03:00
evsel-roundtrip-name.c libperf: Add perf_evlist__first()/last() functions 2019-09-25 09:51:48 -03:00
evsel-tp-sched.c perf evsel: Rename perf_evsel__delete() to evsel__delete() 2019-07-29 18:34:43 -03:00
expr.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00
fdarray.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hists_common.c perf tools: Move event synthesizing routines to separate header 2019-09-20 09:19:22 -03:00
hists_common.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hists_cumulate.c libperf: Add perf_evlist__first()/last() functions 2019-09-25 09:51:48 -03:00
hists_filter.c perf tools: Remove needless thread.h include directives 2019-08-31 22:24:10 -03:00
hists_link.c libperf: Add perf_evlist__first()/last() functions 2019-09-25 09:51:48 -03:00
hists_output.c libperf: Add perf_evlist__first()/last() functions 2019-09-25 09:51:48 -03:00
is_printable_array.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
keep-tracking.c libperf: Adopt perf_mmap__read_event() from tools/perf 2019-10-10 11:49:46 -03:00
kmod-path.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00
llvm.c perf tools: Remove util.h from where it is not needed 2019-09-20 09:19:20 -03:00
llvm.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
make perf tests: Fix static build test 2019-09-20 14:37:28 -03:00
maps.c perf tests: Rename tests/map_groups.c to tests/maps.c 2019-11-26 11:07:46 -03:00
mem.c perf symbols: Move mem_info and branch_info out of symbol.h 2019-08-31 22:27:48 -03:00
mem2node.c perf env: Remove needless cpumap.h header 2019-09-20 09:19:21 -03:00
mmap-basic.c libperf: Adopt perf_mmap__read_event() from tools/perf 2019-10-10 11:49:46 -03:00
mmap-thread-lookup.c libperf: Move 'page_size' global variable to libperf 2019-09-25 09:51:48 -03:00
openat-syscall-all-cpus.c perf env: Remove needless cpumap.h header 2019-09-20 09:19:21 -03:00
openat-syscall-tp-fields.c libperf: Adopt perf_mmap__read_event() from tools/perf 2019-10-10 11:49:46 -03:00
openat-syscall.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00
parse-events.c perf parse: Report initial event parsing error 2019-11-18 19:14:29 -03:00
parse-no-sample-id-all.c perf tools: Remove util.h from where it is not needed 2019-09-20 09:19:20 -03:00
perf-hooks.c perf tests: Avoid raising SEGV using an obvious NULL dereference 2019-09-27 09:26:14 -03:00
perf-record.c libperf: Adopt perf_mmap__read_event() from tools/perf 2019-10-10 11:49:46 -03:00
perf-targz-src-pkg License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pmu.c perf tools: Remove util.h from where it is not needed 2019-09-20 09:19:20 -03:00
python-use.c perf test: Use header file util/debug.h 2018-06-04 10:28:53 -03:00
sample-parsing.c perf tools: Add kernel AUX area sampling definitions 2019-11-21 10:54:20 -03:00
sdt.c perf tools: No need to include internal/lib.h from util/util.h 2019-09-25 09:51:48 -03:00
stat.c perf tools: Move event synthesizing routines to separate header 2019-09-20 09:19:22 -03:00
sw-clock.c libperf: Adopt perf_mmap__read_event() from tools/perf 2019-10-10 11:49:46 -03:00
switch-tracking.c libperf: Adopt perf_mmap__read_event() from tools/perf 2019-10-10 11:49:46 -03:00
task-exit.c perf test: Avoid infinite loop for task exit case 2019-10-15 08:36:22 -03:00
tests.h perf evlist: Maintain evlist->all_cpus 2019-11-29 12:20:45 -03:00
thread-map.c perf tools: Move event synthesizing routines to separate header 2019-09-20 09:19:22 -03:00
thread-maps-share.c perf tests: Rename thread-mg-share to thread-maps-share 2019-11-26 11:07:46 -03:00
time-utils-test.c perf evlist: Rename struct perf_evlist to struct evlist 2019-07-29 18:34:42 -03:00
topology.c perf session: Return error code for perf_session__new() function on failure 2019-09-20 15:58:11 -03:00
unit_number__scnprintf.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00
vmlinux-kallsyms.c perf maps: Merge 'struct maps' with 'struct map_groups' 2019-11-26 11:07:46 -03:00
wp.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00