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Add a test that creates 3 instances and enables function_graph tracer in each as well as the top instance, where each will enable a filter (but one that traces all functions) and check that they are filtering properly. Link: https://lore.kernel.org/linux-trace-kernel/20240603190825.252845939@goodmis.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com> Cc: Florent Revest <revest@chromium.org> Cc: Martin KaFai Lau <martin.lau@linux.dev> Cc: bpf <bpf@vger.kernel.org> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Alan Maguire <alan.maguire@oracle.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Guo Ren <guoren@kernel.org> Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
104 lines
2.1 KiB
Bash
104 lines
2.1 KiB
Bash
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: ftrace - function graph filters
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# requires: set_ftrace_filter function_graph:tracer
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# Make sure that function graph filtering works
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INSTANCE1="instances/test1_$$"
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INSTANCE2="instances/test2_$$"
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INSTANCE3="instances/test3_$$"
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WD=`pwd`
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do_reset() {
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cd $WD
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if [ -d $INSTANCE1 ]; then
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echo nop > $INSTANCE1/current_tracer
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rmdir $INSTANCE1
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fi
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if [ -d $INSTANCE2 ]; then
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echo nop > $INSTANCE2/current_tracer
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rmdir $INSTANCE2
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fi
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if [ -d $INSTANCE3 ]; then
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echo nop > $INSTANCE3/current_tracer
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rmdir $INSTANCE3
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fi
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}
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mkdir $INSTANCE1
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if ! grep -q function_graph $INSTANCE1/available_tracers; then
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echo "function_graph not allowed with instances"
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rmdir $INSTANCE1
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exit_unsupported
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fi
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mkdir $INSTANCE2
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mkdir $INSTANCE3
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fail() { # msg
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do_reset
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echo $1
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exit_fail
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}
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disable_tracing
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clear_trace
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do_test() {
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REGEX=$1
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TEST=$2
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# filter something, schedule is always good
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if ! echo "$REGEX" > set_ftrace_filter; then
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fail "can not enable filter $REGEX"
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fi
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echo > trace
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echo function_graph > current_tracer
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enable_tracing
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sleep 1
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# search for functions (has "{" or ";" on the line)
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echo 0 > tracing_on
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count=`cat trace | grep -v '^#' | grep -e '{' -e ';' | grep -v "$TEST" | wc -l`
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echo 1 > tracing_on
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if [ $count -ne 0 ]; then
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fail "Graph filtering not working by itself against $TEST?"
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fi
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# Make sure we did find something
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echo 0 > tracing_on
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count=`cat trace | grep -v '^#' | grep -e '{' -e ';' | grep "$TEST" | wc -l`
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echo 1 > tracing_on
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if [ $count -eq 0 ]; then
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fail "No traces found with $TEST?"
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fi
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}
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do_test '*sched*' 'sched'
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cd $INSTANCE1
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do_test '*lock*' 'lock'
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cd $WD
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cd $INSTANCE2
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do_test '*rcu*' 'rcu'
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cd $WD
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cd $INSTANCE3
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echo function_graph > current_tracer
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sleep 1
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count=`cat trace | grep -v '^#' | grep -e '{' -e ';' | grep "$TEST" | wc -l`
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if [ $count -eq 0 ]; then
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fail "No traces found with all tracing?"
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fi
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cd $WD
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echo nop > current_tracer
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echo nop > $INSTANCE1/current_tracer
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echo nop > $INSTANCE2/current_tracer
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echo nop > $INSTANCE3/current_tracer
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do_reset
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exit 0
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