tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-dynstring.tc

Source file repositories/reference/linux-study-clean/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-dynstring.tc

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-dynstring.tc
Extension
.tc
Size
1281 bytes
Lines
32
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: event trigger - test inter-event histogram trigger trace action with dynamic string param
# requires: set_event synthetic_events events/sched/sched_process_exec/hist "' >> synthetic_events":README ping:program

fail() { #msg
    echo $1
    exit_fail
}

echo "Test create synthetic event"

echo 'ping_test_latency u64 lat; char filename[]' > synthetic_events
if [ ! -d events/synthetic/ping_test_latency ]; then
    fail "Failed to create ping_test_latency synthetic event"
fi

echo "Test create histogram for synthetic event using trace action and dynamic strings"
echo "Test histogram dynamic string variables,simple expression support and trace action"

echo 'hist:key=pid:filenamevar=filename:ts0=common_timestamp.usecs' > events/sched/sched_process_exec/trigger
echo 'hist:key=pid:lat=common_timestamp.usecs-$ts0:onmatch(sched.sched_process_exec).ping_test_latency($lat,$filenamevar) if comm == "ping"' > events/sched/sched_process_exit/trigger
echo 'hist:keys=filename,lat:sort=filename,lat' > events/synthetic/ping_test_latency/trigger

ping $LOCALHOST -c 5

if ! grep -q "ping" events/synthetic/ping_test_latency/hist; then
    fail "Failed to create dynamic string trace action inter-event histogram"
fi

exit 0

Annotation

Implementation Notes