tools/testing/selftests/ftrace/test.d/ftrace/fgraph-multi.tc

Source file repositories/reference/linux-study-clean/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-multi.tc

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/ftrace/test.d/ftrace/fgraph-multi.tc
Extension
.tc
Size
2194 bytes
Lines
104
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: ftrace - function graph filters
# requires: set_ftrace_filter function_graph:tracer

# Make sure that function graph filtering works

INSTANCE1="instances/test1_$$"
INSTANCE2="instances/test2_$$"
INSTANCE3="instances/test3_$$"

WD=`pwd`

do_reset() {
    cd $WD
    if [ -d $INSTANCE1 ]; then
	echo nop > $INSTANCE1/current_tracer
	rmdir $INSTANCE1
    fi
    if [ -d $INSTANCE2 ]; then
	echo nop > $INSTANCE2/current_tracer
	rmdir $INSTANCE2
    fi
    if [ -d $INSTANCE3 ]; then
	echo nop > $INSTANCE3/current_tracer
	rmdir $INSTANCE3
    fi
}

mkdir $INSTANCE1
if ! grep -q function_graph $INSTANCE1/available_tracers; then
    echo "function_graph not allowed with instances"
    rmdir $INSTANCE1
    exit_unsupported
fi

mkdir $INSTANCE2
mkdir $INSTANCE3

fail() { # msg
    do_reset
    echo $1
    exit_fail
}

disable_tracing
clear_trace

do_test() {
    REGEX=$1
    TEST=$2

    # filter something, schedule is always good
    if ! echo "$REGEX" > set_ftrace_filter; then
	fail "can not enable filter $REGEX"
    fi

    echo > trace
    echo function_graph > current_tracer
    enable_tracing
    sleep 1
    # search for functions (has "{" or ";" on the line)
    echo 0 > tracing_on
    count=`cat trace | grep -v '^#' | grep -e '{' -e ';' | grep -v "$TEST" | wc -l`
    echo 1 > tracing_on
    if [ $count -ne 0 ]; then
	fail "Graph filtering not working by itself against $TEST?"
    fi

    # Make sure we did find something

Annotation

Implementation Notes