Commit 621a59d8 authored by Tom Zanussi's avatar Tom Zanussi Committed by Steven Rostedt (Google)
Browse files

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

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: default avatarTom Zanussi <zanussi@kernel.org>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent 9236eebd

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-fully-qualified-var-ref.tc

0 → 100644
+34 −0
Original line number Diff line number Diff line 
#!/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