6.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: James Clark james.clark@arm.com
[ Upstream commit ff16aeb9b83441b8458d4235496cf320189a0c60 ]
The 2 second sleep can cause the test to fail on very slow network file systems because Perf ends up being killed before it finishes starting up.
Fix it by making the leafloop workload end after a fixed time like the other workloads so there is no need to kill it after 2 seconds.
Also remove the 1 second start sampling delay because it is similarly fragile. Instead, search through all samples for a matching one, rather than just checking the first sample and hoping it's in the right place.
Fixes: cd6382d82752 ("perf test arm64: Test unwinding using fame-pointer (fp) mode") Signed-off-by: James Clark james.clark@arm.com Acked-by: Namhyung Kim namhyung@kernel.org Cc: German Gomez german.gomez@arm.com Cc: Spoorthy S spoorts2@in.ibm.com Cc: Kajol Jain kjain@linux.ibm.com Signed-off-by: Namhyung Kim namhyung@kernel.org Link: https://lore.kernel.org/r/20240612140316.3006660-1-james.clark@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- .../perf/tests/shell/test_arm_callgraph_fp.sh | 27 +++++++------------ tools/perf/tests/workloads/leafloop.c | 20 +++++++++++--- 2 files changed, 26 insertions(+), 21 deletions(-)
diff --git a/tools/perf/tests/shell/test_arm_callgraph_fp.sh b/tools/perf/tests/shell/test_arm_callgraph_fp.sh index 61898e2566160..9caa361301759 100755 --- a/tools/perf/tests/shell/test_arm_callgraph_fp.sh +++ b/tools/perf/tests/shell/test_arm_callgraph_fp.sh @@ -28,28 +28,21 @@ cleanup_files()
trap cleanup_files EXIT TERM INT
-# Add a 1 second delay to skip samples that are not in the leaf() function # shellcheck disable=SC2086 -perf record -o "$PERF_DATA" --call-graph fp -e cycles//u -D 1000 --user-callchains -- $TEST_PROGRAM 2> /dev/null & -PID=$! +perf record -o "$PERF_DATA" --call-graph fp -e cycles//u --user-callchains -- $TEST_PROGRAM
-echo " + Recording (PID=$PID)..." -sleep 2 -echo " + Stopping perf-record..." - -kill $PID -wait $PID +# Try opening the file so any immediate errors are visible in the log +perf script -i "$PERF_DATA" -F comm,ip,sym | head -n4
-# expected perf-script output: +# expected perf-script output if 'leaf' has been inserted correctly: # -# program +# perf # 728 leaf # 753 parent # 76c leafloop -# ... +# ... remaining stack to main() ...
-perf script -i "$PERF_DATA" -F comm,ip,sym | head -n4 -perf script -i "$PERF_DATA" -F comm,ip,sym | head -n4 | \ - awk '{ if ($2 != "") sym[i++] = $2 } END { if (sym[0] != "leaf" || - sym[1] != "parent" || - sym[2] != "leafloop") exit 1 }' +# Each frame is separated by a tab, some spaces and an address +SEP="[[:space:]]+ [[:xdigit:]]+" +perf script -i "$PERF_DATA" -F comm,ip,sym | tr '\n' ' ' | \ + grep -E -q "perf $SEP leaf $SEP parent $SEP leafloop" diff --git a/tools/perf/tests/workloads/leafloop.c b/tools/perf/tests/workloads/leafloop.c index 1bf5cc97649b0..f7561767e32cd 100644 --- a/tools/perf/tests/workloads/leafloop.c +++ b/tools/perf/tests/workloads/leafloop.c @@ -1,6 +1,8 @@ /* SPDX-License-Identifier: GPL-2.0 */ +#include <signal.h> #include <stdlib.h> #include <linux/compiler.h> +#include <unistd.h> #include "../tests.h"
/* We want to check these symbols in perf script */ @@ -8,10 +10,16 @@ noinline void leaf(volatile int b); noinline void parent(volatile int b);
static volatile int a; +static volatile sig_atomic_t done; + +static void sighandler(int sig __maybe_unused) +{ + done = 1; +}
noinline void leaf(volatile int b) { - for (;;) + while (!done) a += b; }
@@ -22,12 +30,16 @@ noinline void parent(volatile int b)
static int leafloop(int argc, const char **argv) { - int c = 1; + int sec = 1;
if (argc > 0) - c = atoi(argv[0]); + sec = atoi(argv[0]); + + signal(SIGINT, sighandler); + signal(SIGALRM, sighandler); + alarm(sec);
- parent(c); + parent(sec); return 0; }