tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-inter-event-combined-hist.tc

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-inter-event-combined-hist.tc
Extension
.tc
Size
1703 bytes
Lines
38
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 combined histogram trigger
# 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 'waking_latency  u64 lat pid_t pid' > synthetic_events
if [ ! -d events/synthetic/waking_latency ]; then
    fail "Failed to create waking_latency synthetic event"
fi

echo "Test combined histogram"

echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="ping"' > events/sched/sched_waking/trigger
echo 'hist:keys=pid:waking_lat=common_timestamp.usecs-$ts0:onmatch(sched.sched_waking).waking_latency($waking_lat,pid) if comm=="ping"' > events/sched/sched_wakeup/trigger
echo 'hist:keys=pid,lat:sort=pid,lat' > events/synthetic/waking_latency/trigger

echo 'wakeup_latency u64 lat pid_t pid' >> synthetic_events
echo 'hist:keys=pid:ts1=common_timestamp.usecs if comm=="ping"' >> events/sched/sched_wakeup/trigger
echo 'hist:keys=next_pid:wakeup_lat=common_timestamp.usecs-$ts1:onmatch(sched.sched_wakeup).wakeup_latency($wakeup_lat,next_pid) if next_comm=="ping"' > events/sched/sched_switch/trigger

echo 'waking_plus_wakeup_latency u64 lat; pid_t pid' >> synthetic_events
echo 'hist:keys=pid,lat:sort=pid,lat:ww_lat=$waking_lat+$wakeup_lat:onmatch(synthetic.wakeup_latency).waking_plus_wakeup_latency($ww_lat,pid)' >> events/synthetic/wakeup_latency/trigger
echo 'hist:keys=pid,lat:sort=pid,lat' >> events/synthetic/waking_plus_wakeup_latency/trigger

ping $LOCALHOST -c 3
if ! grep -q "pid:" events/synthetic/waking_plus_wakeup_latency/hist; then
    fail "Failed to create combined histogram"
fi

exit 0

Annotation

Implementation Notes