mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-04 20:19:47 +08:00
c738a34417
I found it failed on machines with limited memory because 16M byte per-cpu buffer is too big. The reason it added the option is not to miss tracing data. Thus we can limit the data size by reducing the function call depth instead of increasing the buffer size to handle the whole data. As it used the same option in the test_ftrace_trace() and it was able to find the sleep function, it should work with the profile subcommand. Get rid of other grep commands which might be affected by the depth change. Reported-by: Thomas Richter <tmricht@linux.ibm.com> Reviewed-by: James Clark <james.clark@linaro.org> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sumanth Korikkar <sumanthk@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Link: https://lore.kernel.org/r/20250107224352.1128669-3-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
87 lines
2.2 KiB
Bash
Executable File
87 lines
2.2 KiB
Bash
Executable File
#!/bin/sh
|
|
# perf ftrace tests
|
|
# SPDX-License-Identifier: GPL-2.0
|
|
|
|
set -e
|
|
|
|
# perf ftrace commands only works for root
|
|
if [ "$(id -u)" != 0 ]; then
|
|
echo "perf ftrace test [Skipped: no permission]"
|
|
exit 2
|
|
fi
|
|
|
|
output=$(mktemp /tmp/__perf_test.ftrace.XXXXXX)
|
|
|
|
cleanup() {
|
|
rm -f "${output}"
|
|
|
|
trap - EXIT TERM INT
|
|
}
|
|
|
|
trap_cleanup() {
|
|
cleanup
|
|
exit 1
|
|
}
|
|
trap trap_cleanup EXIT TERM INT
|
|
|
|
# this will be set in test_ftrace_trace()
|
|
target_function=
|
|
|
|
test_ftrace_list() {
|
|
echo "perf ftrace list test"
|
|
perf ftrace -F > "${output}"
|
|
# this will be used in test_ftrace_trace()
|
|
sleep_functions=$(grep 'sys_.*sleep$' "${output}")
|
|
echo "syscalls for sleep:"
|
|
echo "${sleep_functions}"
|
|
echo "perf ftrace list test [Success]"
|
|
}
|
|
|
|
test_ftrace_trace() {
|
|
echo "perf ftrace trace test"
|
|
perf ftrace trace --graph-opts depth=5 sleep 0.1 > "${output}"
|
|
# it should have some function name contains 'sleep'
|
|
grep "^#" "${output}"
|
|
grep -F 'sleep()' "${output}"
|
|
# find actual syscall function name
|
|
for FN in ${sleep_functions}; do
|
|
if grep -q "${FN}" "${output}"; then
|
|
target_function="${FN}"
|
|
echo "perf ftrace trace test [Success]"
|
|
return
|
|
fi
|
|
done
|
|
|
|
echo "perf ftrace trace test [Failure: sleep syscall not found]"
|
|
exit 1
|
|
}
|
|
|
|
test_ftrace_latency() {
|
|
echo "perf ftrace latency test"
|
|
echo "target function: ${target_function}"
|
|
perf ftrace latency -T "${target_function}" sleep 0.1 > "${output}"
|
|
grep "^#" "${output}"
|
|
grep "###" "${output}"
|
|
echo "perf ftrace latency test [Success]"
|
|
}
|
|
|
|
test_ftrace_profile() {
|
|
echo "perf ftrace profile test"
|
|
perf ftrace profile --graph-opts depth=5 sleep 0.1 > "${output}"
|
|
grep ^# "${output}"
|
|
time_re="[[:space:]]+1[[:digit:]]{5}\.[[:digit:]]{3}"
|
|
# 100283.000 100283.000 100283.000 1 __x64_sys_clock_nanosleep
|
|
# Check for one *clock_nanosleep line with a Count of just 1 that takes a bit more than 0.1 seconds
|
|
# Strip the _x64_sys part to work with other architectures
|
|
grep -E "^${time_re}${time_re}${time_re}[[:space:]]+1[[:space:]]+.*clock_nanosleep" "${output}"
|
|
echo "perf ftrace profile test [Success]"
|
|
}
|
|
|
|
test_ftrace_list
|
|
test_ftrace_trace
|
|
test_ftrace_latency
|
|
test_ftrace_profile
|
|
|
|
cleanup
|
|
exit 0
|