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selftests/ftrace: Add test case for fully-qualified variable references

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This test adds a variable (ts0) to two events (sched_waking and
sched_wakeup) and uses a fully-qualified variable reference to expicitly
choose a particular one (sched_wakeup.$ts0) when calculating the wakeup
latency.

Link: https://patch.msgid.link/ce9d96aeb84b2d40bd469fe9a346e225442873b1.1776112478.git.zanussi@kernel.org
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi 2026-04-13 17:35:38 -05:00 committed by Steven Rostedt (Google)
parent 9236eebd13
commit 621a59d8fc
1 changed files with 34 additions and 0 deletions
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34
tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-fully-qualified-var-ref.tc Normal file
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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: event trigger - test fully-qualified variable reference support
# requires: set_event synthetic_events events/sched/sched_process_fork/hist ping:program
fail() { #msg
echo $1
exit_fail
}
echo "Test fully-qualified variable reference support"
echo 'wakeup_latency u64 lat; pid_t pid; int prio; char comm[16]' > synthetic_events
echo 'hist:keys=comm:ts0=common_timestamp.usecs if comm=="ping"' > events/sched/sched_waking/trigger
echo 'hist:keys=comm:ts0=common_timestamp.usecs if comm=="ping"' > events/sched/sched_wakeup/trigger
echo 'hist:keys=next_comm:wakeup_lat=common_timestamp.usecs-sched.sched_wakeup.$ts0:onmatch(sched.sched_waking).wakeup_latency($wakeup_lat,next_pid,sched.sched_waking.prio,next_comm) if next_comm=="ping"' > events/sched/sched_switch/trigger
echo 'hist:keys=pid,prio,comm:vals=lat:sort=pid,prio' > events/synthetic/wakeup_latency/trigger
ping $LOCALHOST -c 3
if ! grep -q "ping" events/synthetic/wakeup_latency/hist; then
fail "Failed to create inter-event histogram"
fi
if ! grep -q "synthetic_prio=prio" events/sched/sched_waking/hist; then
fail "Failed to create histogram with fully-qualified variable reference"
fi
echo '!hist:keys=next_comm:wakeup_lat=common_timestamp.usecs-sched.sched_wakeup.$ts0:onmatch(sched.sched_waking).wakeup_latency($wakeup_lat,next_pid,sched.sched_waking.prio,next_comm) if next_comm=="ping"' >> events/sched/sched_switch/trigger
if grep -q "synthetic_prio=prio" events/sched/sched_waking/hist; then
fail "Failed to remove histogram with fully-qualified variable reference"
fi
exit 0