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linux-stable/tools/perf/tests
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Leo Yan 791ce9c48c perf test: Avoid infinite loop for task exit case 
When executing the task exit testing case, perf gets stuck in an endless
loop this case and doesn't return back on Arm64 Juno board.

After digging into this issue, since Juno board has Arm's big.LITTLE
CPUs, thus the PMUs are not compatible between the big CPUs and little
CPUs.  This leads to a PMU event that cannot be enabled properly when
the traced task is migrated from one variant's CPU to another variant.
Finally, the test case runs into infinite loop for cannot read out any
event data after return from polling.

Eventually, we need to work out formal solution to allow PMU events can
be freely migrated from one CPU variant to another, but this is a
difficult task and a different topic.  This patch tries to fix the Perf
test case to avoid infinite loop, when the testing detects 1000 times
retrying for reading empty events, it will directly bail out and return
failure.  This allows the Perf tool can continue its other test cases.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
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/20191011091942.29841-2-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2019-10-15 08:36:22 -03:00
..
attr perf tools: Save bpf_prog_info and BTF of new BPF programs 2019-03-21 11:27:04 -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 libperf: Adopt perf_mmap__read_event() from tools/perf 2019-10-10 11:49:46 -03:00
bitmap.c perf env: Remove needless cpumap.h header 2019-09-20 09:19:21 -03:00
bp_account.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00
bp_signal.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -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: Add missing SPDX headers 2019-06-17 15:57:19 -03:00
builtin-test.c perf auxtrace: Uninline functions that touch perf_session 2019-08-31 22:24:10 -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 libperf: Adopt perf_mmap__read_event() from tools/perf 2019-10-10 11:49:46 -03:00
cpumap.c perf tools: Move event synthesizing routines to separate header 2019-09-20 09:19:22 -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 tools: Move event synthesizing routines to separate header 2019-09-20 09:19:22 -03:00
event-times.c libperf: Add perf_evlist__first()/last() functions 2019-09-25 09:51:48 -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
map_groups.c perf tests: Add missing SPDX headers 2019-06-17 15:57:19 -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 libperf: Add perf_evlist__first()/last() functions 2019-09-25 09:51:48 -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: Move event synthesizing routines to separate header 2019-09-20 09:19:22 -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 tests: Add a test for time-utils 2019-06-10 16:20:12 -03:00
thread-map.c perf tools: Move event synthesizing routines to separate header 2019-09-20 09:19:22 -03:00
thread-mg-share.c perf tools: Remove needless map.h include directives 2019-08-31 22:24:10 -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 libperf: Move 'page_size' global variable to libperf 2019-09-25 09:51:48 -03:00
wp.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00