linux/tools/perf/tests
James Clark fa7095c5c3 perf unwind: Don't show unwind error messages when augmenting frame pointer stack
Commit Fixes: b9f6fbb3b2 ("perf arm64: Inject missing frames when
using 'perf record --call-graph=fp'") intended to add a 'best effort'
DWARF unwind that improved the frame pointer stack in most scenarios.

It's expected that the unwind will fail sometimes, but this shouldn't be
reported as an error. It only works when the return address can be
determined from the contents of the link register alone.

Fix the error shown when the unwinder requires extra registers by adding
a new flag that suppresses error messages. This flag is not set in the
normal --call-graph=dwarf unwind mode so that behavior is not changed.

Fixes: b9f6fbb3b2 ("perf arm64: Inject missing frames when using 'perf record --call-graph=fp'")
Reported-by: John Garry <john.garry@huawei.com>
Signed-off-by: James Clark <james.clark@arm.com>
Tested-by: John Garry <john.garry@huawei.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Truong <alexandre.truong@arm.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20220406145651.1392529-1-james.clark@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2022-04-09 12:34:29 -03:00
..
attr perf test: Add perf_event_attr tests for the arm_spe event 2022-03-05 16:00:12 -03:00
shell perf test arm64: Test unwinding using fame-pointer (fp) mode 2022-03-21 18:05:23 -03:00
.gitignore
Build
api-io.c
attr.c
attr.py
backward-ring-buffer.c
bitmap.c
bp_account.c
bp_signal.c
bp_signal_overflow.c
bpf-script-example.c
bpf-script-test-kbuild.c
bpf-script-test-prologue.c
bpf-script-test-relocation.c
bpf.c
builtin-test.c
clang.c
code-reading.c
cpumap.c
demangle-java-test.c
demangle-ocaml-test.c
dlfilter-test.c
dso-data.c
dwarf-unwind.c perf unwind: Don't show unwind error messages when augmenting frame pointer stack 2022-04-09 12:34:29 -03:00
event-times.c
event_update.c
evsel-roundtrip-name.c
evsel-tp-sched.c
expand-cgroup.c
expr.c
fdarray.c
genelf.c
hists_common.c
hists_common.h
hists_cumulate.c
hists_filter.c
hists_link.c
hists_output.c
is_printable_array.c
keep-tracking.c
kmod-path.c
llvm.c
llvm.h
make
maps.c
mem.c
mem2node.c
mmap-basic.c
mmap-thread-lookup.c
openat-syscall-all-cpus.c
openat-syscall-tp-fields.c
openat-syscall.c
parse-events.c
parse-metric.c
parse-no-sample-id-all.c
pe-file-parsing.c
pe-file.c
pe-file.exe
pe-file.exe.debug
perf-hooks.c
perf-record.c
perf-targz-src-pkg
perf-time-to-tsc.c perf test tsc: Fix error message when not supported 2022-04-09 12:34:29 -03:00
pfm.c
pmu-events.c
pmu.c
python-use.c
sample-parsing.c
sdt.c
sigtrap.c perf test: Skip failing sigtrap test for arm+aarch64 2022-02-18 09:54:50 -03:00
stat.c
sw-clock.c
switch-tracking.c
task-exit.c
tests.h
thread-map.c
thread-maps-share.c
time-utils-test.c
topology.c
unit_number__scnprintf.c
vmlinux-kallsyms.c
wp.c