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selftests/ftrace: Add a testcase for multiple fprobe events

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Add a testcase for multiple fprobe events on the same function
so that it clears ftrace hash map correctly when removing the
events.

Link: https://lore.kernel.org/all/177669370353.132053.16801520791509406141.stgit@mhiramat.tok.corp.google.com/

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
This commit is contained in:
Masami Hiramatsu (Google) 2026-04-20 23:01:43 +09:00
parent 132001e9f9
commit 453553e1ed
1 changed files with 69 additions and 0 deletions
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69
tools/testing/selftests/ftrace/test.d/dynevent/add_remove_multiple_fprobe.tc Normal file
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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Generic dynamic event - add/remove multiple fprobe events on the same function
# requires: dynamic_events "f[:[<group>/][<event>]] <func-name>[%return] [<args>]":README enabled_functions
echo 0 > events/enable
echo > dynamic_events
PLACE=vfs_read
PLACE2=vfs_open
:;: 'Ensure no other ftrace user' ;:
test `cat enabled_functions | wc -l` -eq 0 || exit_unresolved
:;: 'Test case 1: leave entry event' ;:
:;: 'Add entry and exit events on the same place' ;:
echo "f:event1 ${PLACE}" >> dynamic_events
echo "f:event2 ${PLACE}%return" >> dynamic_events
:;: 'Enable both of them' ;:
echo 1 > events/fprobes/enable
test `cat enabled_functions | wc -l` -eq 1
:;: 'Disable and remove exit event' ;:
echo 0 > events/fprobes/event2/enable
echo -:event2 >> dynamic_events
:;: 'Disable and remove all events' ;:
echo 0 > events/fprobes/enable
echo > dynamic_events
:;: 'Add another event' ;:
echo "f:event3 ${PLACE2}%return" > dynamic_events
echo 1 > events/fprobes/enable
test `cat enabled_functions | wc -l` -eq 1
:;: 'No other ftrace user' ;:
echo 0 > events/fprobes/enable
echo > dynamic_events
test `cat enabled_functions | wc -l` -eq 0
:;: 'Test case 2: leave exit event' ;:
:;: 'Add entry and exit events on the same place' ;:
echo "f:event1 ${PLACE}" >> dynamic_events
echo "f:event2 ${PLACE}%return" >> dynamic_events
:;: 'Enable both of them' ;:
echo 1 > events/fprobes/enable
test `cat enabled_functions | wc -l` -eq 1
:;: 'Disable and remove entry event' ;:
echo 0 > events/fprobes/event1/enable
echo -:event1 >> dynamic_events
:;: 'Disable and remove all events' ;:
echo 0 > events/fprobes/enable
echo > dynamic_events
:;: 'Add another event' ;:
echo "f:event3 ${PLACE2}" > dynamic_events
echo 1 > events/fprobes/enable
test `cat enabled_functions | wc -l` -eq 1
:;: 'No other ftrace user' ;:
echo 0 > events/fprobes/enable
echo > dynamic_events
test `cat enabled_functions | wc -l` -eq 0
clear_trace