tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc

Source file repositories/reference/linux-study-clean/tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc
Extension
.tc
Size
1776 bytes
Lines
45
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 multiple histogram triggers
# requires: set_event events/sched/sched_process_fork/trigger events/sched/sched_process_fork/hist
# flags: instance

fail() { #msg
    echo $1
    exit_fail
}

echo "Test histogram multiple triggers"

echo 'hist:keys=parent_pid:vals=child_pid' > events/sched/sched_process_fork/trigger
echo 'hist:keys=parent_comm:vals=child_pid' >> events/sched/sched_process_fork/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
grep parent_pid events/sched/sched_process_fork/hist > /dev/null || \
    fail "hist trigger on sched_process_fork did not work"
grep child events/sched/sched_process_fork/hist > /dev/null || \
    fail "hist trigger on sched_process_fork did not work"
COMM=`cat /proc/$$/comm`
grep "parent_comm: $COMM" events/sched/sched_process_fork/hist > /dev/null || \
    fail "string key on sched_process_fork did not work"

reset_trigger

echo "Test histogram with its name"

echo 'hist:name=test_hist:keys=common_pid' > events/sched/sched_process_fork/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
grep test_hist events/sched/sched_process_fork/hist > /dev/null || \
    fail "named event on sched_process_fork did not work"

echo "Test same named histogram on different events"

echo 'hist:name=test_hist:keys=common_pid' > events/sched/sched_process_exit/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
grep test_hist events/sched/sched_process_exit/hist > /dev/null || \
    fail "named event on sched_process_fork did not work"

diffs=`diff events/sched/sched_process_exit/hist events/sched/sched_process_fork/hist | wc -l`
test $diffs -eq 0 || fail "Same name histograms are not same"

exit 0

Annotation

Implementation Notes