6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: James Clark james.clark@arm.com
[ Upstream commit 10b6ee3b597b1b1b4dc390aaf9d589664af31df9 ]
These tests record in a mode that includes kernel trace but look for samples of a userspace process. This makes them sensitive to any kernel compilation options that increase the amount of time spent in the kernel. If the trace buffer is completely filled before userspace is reached then the test will fail. Double the buffer size to fix this.
The other tests in the same file aren't sensitive to this for various reasons, for example the iterate devices test filters by userspace trace only. But in order to keep coverage of all the modes, increase the buffer size rather than filtering by userspace for the basic tests.
Fixes: d1efa4a0a696e487 ("perf cs-etm: Add separate decode paths for timeless and per-thread modes") Reviewed-by: Anshuman Khandual anshuman.khandual@arm.com Signed-off-by: James Clark james.clark@arm.com Cc: Adrian Hunter adrian.hunter@intel.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Ian Rogers irogers@google.com Cc: Ingo Molnar mingo@redhat.com Cc: James Clark james.clark@arm.com Cc: Jiri Olsa jolsa@kernel.org Cc: Mark Rutland mark.rutland@arm.com Cc: Mike Leach mike.leach@linaro.org Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: Suzuki Poulouse suzuki.poulose@arm.com Link: https://lore.kernel.org/r/20240326113749.257250-1-james.clark@arm.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/tests/shell/test_arm_coresight.sh | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/tests/shell/test_arm_coresight.sh b/tools/perf/tests/shell/test_arm_coresight.sh index f1bf5621160fb..4d4e685775303 100755 --- a/tools/perf/tests/shell/test_arm_coresight.sh +++ b/tools/perf/tests/shell/test_arm_coresight.sh @@ -186,7 +186,7 @@ arm_cs_etm_snapshot_test() {
arm_cs_etm_basic_test() { echo "Recording trace with '$*'" - perf record -o ${perfdata} "$@" -- ls > /dev/null 2>&1 + perf record -o ${perfdata} "$@" -m,8M -- ls > /dev/null 2>&1
perf_script_branch_samples ls && perf_report_branch_samples ls &&