rtla/tests: Add runtime test for -k and -u options

Add runtime test for rtla-timerlat's -k/--kernel-threads and
-u/--user-threads options using get_workload_pids.sh to check whether
the appropriate threads are being created.

The tests are implemented for both top and hist. Additionally, all tests
related to timerlat threads are moved to a separate section in the test
files. The latter is also done for rtla-osnoise tests.

Reviewed-by: Wander Lairson Costa <wander@redhat.com>
Link: https://lore.kernel.org/r/20260423130558.882022-9-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>

3 files changed, 30 insertions, 6 deletions

diff --git a/tools/tracing/rtla/tests/osnoise.t b/tools/tracing/rtla/tests/osnoise.t
index cdea84914345..d0b623233db5 100644
--- a/tools/tracing/rtla/tests/osnoise.t
+++ b/tools/tracing/rtla/tests/osnoise.t
@@ -9,13 +9,15 @@ check "verify help page" \
 	"osnoise --help" 0 "osnoise version"
 check_top_hist "verify help page" \
 	"osnoise TOOL --help" 0 "rtla osnoise"
-check_top_q_hist "verify the --priority/-P param" \
-	"osnoise TOOL -P F:1 -c 0 -r 900000 -d 10s -S 1 --on-threshold shell,command=\"tests/scripts/check-priority.sh SCHED_FIFO 1\"" \
-	2 "Priorities are set correctly"
 check_top_q_hist "verify the --stop/-s param" \
 	"osnoise TOOL -s 30 -T 1" 2 "osnoise hit stop tracing"
 check_top_q_hist "verify the --trace param" \
 	"osnoise TOOL -s 30 -T 1 -t" 2 "Saving trace to osnoise_trace.txt"
+
+# Thread tests
+check_top_q_hist "verify the --priority/-P param" \
+	"osnoise TOOL -P F:1 -c 0 -r 900000 -d 10s -S 1 --on-threshold shell,command=\"tests/scripts/check-priority.sh SCHED_FIFO 1\"" \
+	2 "Priorities are set correctly"
 check_top_q_hist "verify the -c/--cpus param" \
 	"osnoise TOOL -P F:1 -c 0 -r 900000 -d 10s -S 1 --on-threshold shell,command=tests/scripts/check-cpus.sh" 2 "^Affinity of threads: 0$"
 check_top_q_hist "verify the -H/--house-keeping param" \
diff --git a/tools/tracing/rtla/tests/scripts/check-user-kernel-threads.sh b/tools/tracing/rtla/tests/scripts/check-user-kernel-threads.sh
new file mode 100755
index 000000000000..bb7ac510a735
--- /dev/null
+++ b/tools/tracing/rtla/tests/scripts/check-user-kernel-threads.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+. "$(dirname $0)/lib/get_workload_pids.sh"
+kthreadd_pid=$(pgrep ^kthreadd$)
+cnt_kernel=0
+cnt_user=0
+for pid in $(get_workload_pids)
+do
+    if [ "$(echo $(ps -o ppid= $pid))" = "$kthreadd_pid" ]
+    then
+        ((++cnt_kernel))
+    else
+        ((++cnt_user))
+    fi
+done
+echo "$cnt_kernel kernel threads, $cnt_user user threads"
diff --git a/tools/tracing/rtla/tests/timerlat.t b/tools/tracing/rtla/tests/timerlat.t
index 20f68bcbcb27..3557adbdebae 100644
--- a/tools/tracing/rtla/tests/timerlat.t
+++ b/tools/tracing/rtla/tests/timerlat.t
@@ -26,9 +26,6 @@ check_top_hist "verify help page" \
 	"timerlat TOOL --help" 0 "rtla timerlat"
 check_top_hist "verify -s/--stack" \
 	"timerlat TOOL -s 3 -T 10 -t" 2 "Blocking thread stack trace"
-check_top_hist "verify -P/--priority" \
-	"timerlat TOOL -P F:1 -c 0 -d 10s -T 1 --on-threshold shell,command=\"tests/scripts/check-priority.sh SCHED_FIFO 1\"" \
-	2 "Priorities are set correctly"
 check_top_hist "test in nanoseconds" \
 	"timerlat TOOL -i 2 -c 0 -n -d 10s" 2 "ns"
 check_top_hist "set the automatic trace mode" \
@@ -41,10 +38,19 @@ check "verify --aa-only max latency" \
 	"timerlat top --aa-only 2000000 -d 1s" 0 "^  Max latency was" "Timer Latency"
 check_top_hist "disable auto-analysis" \
 	"timerlat TOOL -s 3 -T 10 -t --no-aa" 2 "" "analyzing it"
+
+# Thread tests
+check_top_hist "verify -P/--priority" \
+	"timerlat TOOL -P F:1 -c 0 -d 10s -T 1 --on-threshold shell,command=\"tests/scripts/check-priority.sh SCHED_FIFO 1\"" \
+	2 "Priorities are set correctly"
 check_top_q_hist "verify -c/--cpus" \
 	"timerlat TOOL -c 0 -d 10s -T 1 --on-threshold shell,command=tests/scripts/check-cpus.sh" 2 "^Affinity of threads: 0$"
 check_top_q_hist "verify -H/--house-keeping" \
 	"timerlat TOOL -H 0 -d 10s -T 1 --on-threshold shell,command=tests/scripts/check-housekeeping-cpus.sh" 2 "^Affinity of threads: 0$"
+check_top_q_hist "verify -k/--kernel-threads" \
+	"timerlat TOOL -k -c 0 -d 10s -T 1 --on-threshold shell,command=tests/scripts/check-user-kernel-threads.sh" 2 "1 kernel threads, 0 user threads"
+check_top_q_hist "verify -u/--user-threads" \
+	"timerlat TOOL -u -c 0 -d 10s -T 1 --on-threshold shell,command=tests/scripts/check-user-kernel-threads.sh" 2 "0 kernel threads, 1 user threads"
 
 # Histogram tests
 check "hist with -b/--bucket-size" \