Commit 7f09d639 authored by Steven Rostedt (Google)'s avatar Steven Rostedt (Google)
Browse files

tracing/selftests: Add test for event filtering on function name 

With the new filter logic of passing in the name of a function to match an
instruction pointer (or the address of the function), add a test to make
sure that it is functional.

This is also the first test to test plain filtering. The filtering has
been tested via the trigger logic, which uses the same code, but there was
nothing to test just the event filter, so this test is the first to add
such a case.

Link: https://lkml.kernel.org/r/20221219183214.075559302@goodmis.org



Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Tom Zanussi <zanussi@kernel.org>
Cc: Zheng Yejian <zhengyejian1@huawei.com>
Cc: linux-kselftest@vger.kernel.org
Suggested-by: default avatarMasami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: default avatarRoss Zwisler <zwisler@google.com>
Acked-by: default avatarShuah Khan <skhan@linuxfoundation.org>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent e6745a4d

tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc

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+58 −0
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#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# description: event filter function - test event filtering on functions

# requires: set_event events/kmem/kmem_cache_free/filter

# flags: instance



fail() { #msg

    echo $1

    exit_fail

}



echo "Test event filter function name"

echo 0 > tracing_on

echo 0 > events/enable

echo > trace

echo 'call_site.function == exit_mmap' > events/kmem/kmem_cache_free/filter

echo 1 > events/kmem/kmem_cache_free/enable

echo 1 > tracing_on

ls > /dev/null

echo 0 > events/kmem/kmem_cache_free/enable



hitcnt=`grep kmem_cache_free trace| grep exit_mmap | wc -l`

misscnt=`grep kmem_cache_free trace| grep -v exit_mmap | wc -l`



if [ $hitcnt -eq 0 ]; then

	exit_fail

fi



if [ $misscnt -gt 0 ]; then

	exit_fail

fi



address=`grep ' exit_mmap$' /proc/kallsyms | cut -d' ' -f1`



echo "Test event filter function address"

echo 0 > tracing_on

echo 0 > events/enable

echo > trace

echo "call_site.function == 0x$address" > events/kmem/kmem_cache_free/filter

echo 1 > events/kmem/kmem_cache_free/enable

echo 1 > tracing_on

sleep 1

echo 0 > events/kmem/kmem_cache_free/enable



hitcnt=`grep kmem_cache_free trace| grep exit_mmap | wc -l`

misscnt=`grep kmem_cache_free trace| grep -v exit_mmap | wc -l`



if [ $hitcnt -eq 0 ]; then

	exit_fail

fi



if [ $misscnt -gt 0 ]; then

	exit_fail

fi



reset_events_filter



exit 0