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

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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: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Google) 2023-01-17 10:21:31 -05:00
parent 88238513bb
commit b81a3a100c
3 changed files with 31 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/trace/trace.c
View File

@ -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
;

24
tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-stack.tc Normal file
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@ -0,0 +1,24 @@
#!/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

6
tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-syntax.tc
View File

@ -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