On 01/07/2022 13:07, carsten.haitzler@xxxxxxxxxxxx wrote:
From: "Carsten Haitzler (Rasterman)" <raster@xxxxxxxxxxxxx>
Add a script to drive the threaded memcpy test that gathers data so
it passes a minimum bar for amount and quality of content that we
extract from the kernel's perf support.
On this one I get a failure about 1/50 times on N1SDP (I ran it about 150
times and saw 3 failures so it's quite consistent). Usually it records
about a 1.4MB file with one aux record. But when it fails the file is
only 20K and has one small aux record:
0 0 0x1a10 [0x30]: PERF_RECORD_AUXTRACE size: 0x1820 offset: 0 ref: 0x1c23126d7ff3d2ab idx: 3 tid: 682799 cpu: 3
Nothing was dropped, and the load on the system wasn't any different
to when it passes. So I'm not sure if this is a real coresight bug
or that the test is flaky. There was a bug in SPE before where
threads weren't followed after forking, but only very rarely. It feels
a bit like that.
It could also be some contention issue because 10 threads are launched
but the machine only has 4 cores.
The failure message from the test looks like this:
77: CoreSight / Memcpy 16k 10 Threads :
--- start ---
Couldn't synthesize bpf events.
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.012 MB ./perf-memcpy_thread-16k_10.data ]
Sanity check number of ASYNC is too low (3 < 10)
---- end ----
CoreSight / Memcpy 16k 10 Threads: FAILED!
I didn't see this issue on any of the other tests. Sometimes very small
files were made if I loaded the system, but the tests still passed.
Thanks
James
Signed-off-by: Carsten Haitzler <carsten.haitzler@xxxxxxx>
---
.../shell/coresight/memcpy_thread_16k_10.sh | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
create mode 100755 tools/perf/tests/shell/coresight/memcpy_thread_16k_10.sh
diff --git a/tools/perf/tests/shell/coresight/memcpy_thread_16k_10.sh b/tools/perf/tests/shell/coresight/memcpy_thread_16k_10.sh
new file mode 100755
index 000000000000..d21ba8545938
--- /dev/null
+++ b/tools/perf/tests/shell/coresight/memcpy_thread_16k_10.sh
@@ -0,0 +1,18 @@
+#!/bin/sh -e
+# CoreSight / Memcpy 16k 10 Threads
+
+# SPDX-License-Identifier: GPL-2.0
+# Carsten Haitzler <carsten.haitzler@xxxxxxx>, 2021
+
+TEST="memcpy_thread"
+. $(dirname $0)/../lib/coresight.sh
+ARGS="16 10 1"
+DATV="16k_10"
+DATA="$DATD/perf-$TEST-$DATV.data"
+
+perf record $PERFRECOPT -o "$DATA" "$BIN" $ARGS
+
+perf_dump_aux_verify "$DATA" 10 10 10
+
+err=$?
+exit $err