Commit b81a3a10 authored by Steven Rostedt (Google)'s avatar Steven Rostedt (Google)
Browse files

tracing/histogram: Add simple tests for stacktrace usage of synthetic events 

Update the selftests to include a test of passing a stacktrace between the
events of a synthetic event.

Link: https://lkml.kernel.org/r/20230117152236.475439286@goodmis.org



Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Tom Zanussi <zanussi@kernel.org>
Cc: Ross Zwisler <zwisler@google.com>
Cc: Ching-lin Yu <chinglinyu@google.com>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent 88238513

kernel/trace/trace.c

+1 −1
Original line number Diff line number Diff line
@@ -5757,7 +5757,7 @@ static const char readme_msg[] = 
#ifdef CONFIG_SYNTH_EVENTS

	"  events/synthetic_events\t- Create/append/remove/show synthetic events\n"

	"\t  Write into this file to define/undefine new synthetic events.\n"

	"\t     example: echo 'myevent u64 lat; char name[]' >> synthetic_events\n"

	"\t     example: echo 'myevent u64 lat; char name[]; long[] stack' >> synthetic_events\n"

#endif

#endif

;

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-stack.tc

0 → 100644
+24 −0
Original line number Diff line number Diff line 
#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# description: event trigger - test inter-event histogram trigger trace action with dynamic string param

# requires: set_event synthetic_events events/sched/sched_process_exec/hist "long[]' >> synthetic_events":README



fail() { #msg

    echo $1

    exit_fail

}



echo "Test create synthetic event with stack"





echo 's:wake_lat pid_t pid; u64 delta; unsigned long[] stack;' > dynamic_events

echo 'hist:keys=next_pid:ts=common_timestamp.usecs,st=stacktrace  if prev_state == 1||prev_state == 2' >> events/sched/sched_switch/trigger

echo 'hist:keys=prev_pid:delta=common_timestamp.usecs-$ts,s=$st:onmax($delta).trace(wake_lat,prev_pid,$delta,$s)' >> events/sched/sched_switch/trigger

echo 1 > events/synthetic/wake_lat/enable

sleep 1



if ! grep -q "=>.*sched" trace; then

    fail "Failed to create synthetic event with stack"

fi



exit 0

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-syntax.tc

+6 −0
Original line number Diff line number Diff line
@@ -70,6 +70,12 @@ grep "myevent[[:space:]]unsigned long var" synthetic_events 
echo "myevent char var[10]" > synthetic_events

grep "myevent[[:space:]]char\[10\] var" synthetic_events



if grep -q 'long\[\]' README; then

  # test stacktrace type

  echo "myevent unsigned long[] var" > synthetic_events

  grep "myevent[[:space:]]unsigned long\[\] var" synthetic_events

fi



do_reset



exit 0