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linux/tools/perf/tests
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James Clark 0f892fd1bd perf tests: Fix flaky test 'Object code reading' 
This test occasionally fails on aarch64 when a sample is taken in
free@plt and it fails with "Bytes read differ from those read by
objdump".

This is because that symbol is near a section boundary in the elf file.
Despite the -z option to always output zeros, objdump uses
bfd_map_over_sections() to iterate through the elf file so it doesn't
see outside of the sections where these zeros are and can't print them.

For example this boundary proceeds free@plt in libc with a gap of 48
bytes between .plt and .text:

  objdump -d -z --start-address=0x23cc8 --stop-address=0x23d08 libc-2.30.so

  libc-2.30.so:     file format elf64-littleaarch64

  Disassembly of section .plt:

  0000000000023cc8 <*ABS*+0x7fd00@plt+0x8>:
     23cc8:	91018210 	add	x16, x16, #0x60
     23ccc:	d61f0220 	br	x17

  Disassembly of section .text:

  0000000000023d00 <abort@@GLIBC_2.17-0x98>:
     23d00:	a9bf7bfd 	stp	x29, x30, [sp, #-16]!
     23d04:	910003fd 	mov	x29, sp

Taking a sample in free@plt is very rare because it is so small, but the
test can be forced to fail almost every time on any platform by linking
the test with a shared library that has a single empty function and
calling it in a loop.

The fix is to zero the buffers so that when there is a jump in the
addresses output by objdump, zeros are already filled in between.

Signed-off-by: James Clark <james.clark@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/20210906152238.3415467-1-james.clark@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2021-09-27 09:32:28 -03:00
..
attr perf test: Test 17 fails with make LIBPFM4=1 on s390 z/VM 2021-06-01 10:57:39 -03:00
shell perf tests: Fix *probe_vfs_getname.sh test failures 2021-08-30 10:06:43 -03:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
api-io.c tools api: Add a lightweight buffered reading api 2020-04-30 10:48:28 -03:00
attr.c perf tests: Skip 'Setup struct perf_event_attr' test for hybrid 2021-04-29 10:31:00 -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 evlist: Use the right prefix for 'struct evlist' event attribute config methods 2020-11-30 15:15:27 -03:00
bitmap.c tools: rename bitmap_alloc() to bitmap_zalloc() 2021-09-08 11:50:27 -07:00
bp_account.c perf tests bp_account: Make global variable static 2020-03-02 11:15:07 -03:00
bp_signal_overflow.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00
bp_signal.c perf tools: Fix various typos in comments 2021-03-23 17:13:43 -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 perf test: Fix bpf test sample mismatch reporting 2021-09-10 11:45:19 -03:00
Build perf tests: Add dlfilter test 2021-08-11 09:35:44 -03:00
builtin-test.c perf test: Make --skip work on shell tests 2021-08-11 15:45:08 -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 tests: Fix flaky test 'Object code reading' 2021-09-27 09:32:28 -03:00
cpumap.c perf test: Fix cpu map leaks in cpu_map_print test 2021-03-06 16:54:29 -03:00
demangle-java-test.c perf tests: Add test for the java demangler 2020-05-28 10:03:28 -03:00
demangle-ocaml-test.c perf tools: Preserve identifier id in OCaml demangler 2021-03-30 12:45:59 -03:00
dlfilter-test.c perf tests dlfilter: Free desc and long_desc in check_filter_desc 2021-08-20 11:16:27 -03:00
dso-data.c perf test: Handle fd gaps in test__dso_data_reopen 2021-08-02 10:01:54 -03:00
dwarf-unwind.c perf test: Fix DWARF unwind for optimized builds. 2021-09-27 09:32:28 -03:00
event_update.c perf test event_update: Fix memory leak of unit 2021-07-15 17:27:52 -03:00
event-times.c perf evlist: Use the right prefix for 'struct evlist' create maps methods 2020-11-30 14:56:52 -03:00
evsel-roundtrip-name.c perf tests: Fix 'Roundtrip evsel->name' on core-only system 2021-07-14 10:05:35 -03:00
evsel-tp-sched.c perf evsel: Convert last 'struct evsel' methods to the right evsel__ prefix 2020-11-30 09:08:24 -03:00
expand-cgroup.c perf evlist: Use the right prefix for alternative 'struct evlist' constructors 2020-11-30 15:04:05 -03:00
expr.c perf metric: Add 'struct expr_id_data' to keep expr value 2020-07-17 09:09:48 -03:00
fdarray.c libperf: Add flags to fdarray fds objects 2020-07-21 09:52:51 -03:00
genelf.c perf jit: Move test functionality in to a test 2019-11-29 12:20:45 -03:00
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 perf tools: Fix various typos in comments 2021-03-23 17:13:43 -03:00
hists_filter.c perf hists: Split hists_stats from events_stats 2021-04-29 10:30:58 -03:00
hists_link.c libperf: Add perf_evlist__first()/last() functions 2019-09-25 09:51:48 -03:00
hists_output.c perf evsel: Rename perf_evsel__resort*() to evsel__resort*() 2020-05-28 10:03:24 -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 perf test: Fix cpu and thread map leaks in keep_tracking test 2021-03-06 16:54:28 -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: Fix LLVM test failure when running in verbose mode 2021-08-31 15:17:45 -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 tools: Test build with libbpf/LIBBPF_DYNAMIC=1 2021-05-17 20:32:05 -03:00
maps.c perf test maps__merge_in: Fix memory leak of maps 2021-07-15 17:27:52 -03:00
mem2node.c tools: rename bitmap_alloc() to bitmap_zalloc() 2021-09-08 11:50:27 -07:00
mem.c perf symbols: Move mem_info and branch_info out of symbol.h 2019-08-31 22:27:48 -03:00
mmap-basic.c libperf: Move 'idx' from tools/perf to perf_evsel::idx 2021-07-09 14:04:28 -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 unneeded internal/cpumap inclusions 2021-02-12 17:35:48 -03:00
openat-syscall-tp-fields.c perf evlist: Use the right prefix for alternative 'struct evlist' constructors 2020-11-30 15:04:05 -03:00
openat-syscall.c perf evsel: Rename perf_evsel__new*() to evsel__new*() 2020-05-28 10:03:24 -03:00
parse-events.c perf tests: Add test for PMU aliases 2021-09-03 08:38:49 -03:00
parse-metric.c perf tests: Support 'Parse and process metrics' test for hybrid 2021-04-29 10:31:00 -03:00
parse-no-sample-id-all.c perf evlist: Use the right prefix for 'struct evlist' sample parsing methods 2020-11-30 09:43:07 -03:00
pe-file-parsing.c perf tools: Pass build_id object to filename__read_build_id() 2020-10-14 08:45:16 -03:00
pe-file.c perf tests: Add test for PE binary format support 2020-09-04 14:38:15 -03:00
pe-file.exe perf tests: Add test for PE binary format support 2020-09-04 14:38:15 -03:00
pe-file.exe.debug perf tests: Add test for PE binary format support 2020-09-04 14:38:15 -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 perf evlist: Use the right prefix for 'struct evlist' event attribute config methods 2020-11-30 15:15:27 -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
perf-time-to-tsc.c perf tests: Fix 'Convert perf time to TSC' on core-only system 2021-07-14 10:05:35 -03:00
pfm.c libperf: Move 'nr_groups' from tools/perf to evlist::nr_groups 2021-07-09 14:04:32 -03:00
pmu-events.c perf test: Add pmu-events sys event support 2021-08-10 14:47:52 -03:00
pmu.c perf test: Free formats for perf pmu parse test 2020-09-15 09:22:42 -03:00
python-use.c perf tests: Show python test script in verbose mode 2020-10-13 16:22:03 -03:00
sample-parsing.c perf test: Fix sample-parsing failure on non-x86 platforms 2021-03-06 16:54:31 -03:00
sdt.c perf tools: Pass build_id object to build_id__sprintf() 2020-10-14 08:46:22 -03:00
stat.c perf tools: Move event synthesizing routines to separate header 2019-09-20 09:19:22 -03:00
sw-clock.c perf test: Fix cpu and thread map leaks in sw_clock_freq test 2021-03-06 16:54:28 -03:00
switch-tracking.c perf tests: Support 'Track with sched_switch' test for hybrid 2021-04-29 10:31:00 -03:00
task-exit.c perf test: Fix cpu and thread map leaks in task_exit test 2021-03-06 16:54:28 -03:00
tests.h perf tests: Add dlfilter test 2021-08-11 09:35:44 -03:00
thread-map.c perf test: Fix a memory leak in thread_map_remove test 2021-03-06 16:54:29 -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 tools: Remove repipe argument from perf_session__new() 2021-08-02 10:06:51 -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 test: Implement skip_reason callback for watchpoint tests 2020-11-04 09:42:40 -03:00