Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
selftests/ftrace: Add a testcase for multiple fprobe events
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>
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+69
tools/testing/selftests/ftrace/test.d/dynevent/add_remove_multiple_fprobe.tc
+69
tools/testing/selftests/ftrace/test.d/dynevent/add_remove_multiple_fprobe.tc
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: Generic dynamic event - add/remove multiple fprobe events on the same function
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# requires: dynamic_events "f[:[<group>/][<event>]] <func-name>[%return] [<args>]":README enabled_functions
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echo 0 > events/enable
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echo > dynamic_events
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PLACE=vfs_read
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PLACE2=vfs_open
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:;: 'Ensure no other ftrace user' ;:
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test `cat enabled_functions | wc -l` -eq 0 || exit_unresolved
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:;: 'Test case 1: leave entry event' ;:
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:;: 'Add entry and exit events on the same place' ;:
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echo "f:event1 ${PLACE}" >> dynamic_events
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echo "f:event2 ${PLACE}%return" >> dynamic_events
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:;: 'Enable both of them' ;:
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echo 1 > events/fprobes/enable
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test `cat enabled_functions | wc -l` -eq 1
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:;: 'Disable and remove exit event' ;:
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echo 0 > events/fprobes/event2/enable
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echo -:event2 >> dynamic_events
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:;: 'Disable and remove all events' ;:
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echo 0 > events/fprobes/enable
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echo > dynamic_events
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:;: 'Add another event' ;:
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echo "f:event3 ${PLACE2}%return" > dynamic_events
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echo 1 > events/fprobes/enable
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test `cat enabled_functions | wc -l` -eq 1
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:;: 'No other ftrace user' ;:
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echo 0 > events/fprobes/enable
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echo > dynamic_events
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test `cat enabled_functions | wc -l` -eq 0
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:;: 'Test case 2: leave exit event' ;:
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:;: 'Add entry and exit events on the same place' ;:
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echo "f:event1 ${PLACE}" >> dynamic_events
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echo "f:event2 ${PLACE}%return" >> dynamic_events
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:;: 'Enable both of them' ;:
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echo 1 > events/fprobes/enable
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test `cat enabled_functions | wc -l` -eq 1
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:;: 'Disable and remove entry event' ;:
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echo 0 > events/fprobes/event1/enable
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echo -:event1 >> dynamic_events
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:;: 'Disable and remove all events' ;:
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echo 0 > events/fprobes/enable
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echo > dynamic_events
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:;: 'Add another event' ;:
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echo "f:event3 ${PLACE2}" > dynamic_events
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echo 1 > events/fprobes/enable
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test `cat enabled_functions | wc -l` -eq 1
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:;: 'No other ftrace user' ;:
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echo 0 > events/fprobes/enable
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echo > dynamic_events
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test `cat enabled_functions | wc -l` -eq 0
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clear_trace