tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onmatch-onmax-action-hist.tc

Source file repositories/reference/linux-study-clean/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onmatch-onmax-action-hist.tc

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onmatch-onmax-action-hist.tc
Extension
.tc
Size
1300 bytes
Lines
31
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 onmatch-onmax action
# requires: set_event synthetic_events events/sched/sched_process_fork/hist ping:program

fail() { #msg
    echo $1
    exit_fail
}

echo "Test create synthetic event"

echo 'wakeup_latency  u64 lat pid_t pid char comm[16]' > synthetic_events
if [ ! -d events/synthetic/wakeup_latency ]; then
    fail "Failed to create wakeup_latency synthetic event"
fi

echo "Test create histogram for synthetic event"
echo "Test histogram variables,simple expression support and onmatch-onmax action"

echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="ping"' > events/sched/sched_wakeup/trigger
echo 'hist:keys=next_pid:wakeup_lat=common_timestamp.usecs-$ts0:onmatch(sched.sched_wakeup).wakeup_latency($wakeup_lat,next_pid,next_comm):onmax($wakeup_lat).save(next_comm,prev_pid,prev_prio,prev_comm) if next_comm=="ping"' >> events/sched/sched_switch/trigger
echo 'hist:keys=comm,pid,lat:wakeup_lat=lat:sort=lat' > events/synthetic/wakeup_latency/trigger

ping $LOCALHOST -c 5
if [ ! grep -q "ping" events/synthetic/wakeup_latency/hist -o ! grep -q "max:" events/sched/sched_switch/hist]; then
    fail "Failed to create onmatch-onmax action inter-event histogram"
fi

exit 0

Annotation

Implementation Notes