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

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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: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Ross Zwisler <zwisler@google.com>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Google) 2022-12-19 13:31:08 -05:00
parent e6745a4da9
commit 7f09d639b8
1 changed files with 58 additions and 0 deletions
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58
tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc Normal file
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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