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

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc
Extension
.tc
Size
2635 bytes
Lines
77
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 histogram trigger
# 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 basic trigger"

echo 'hist:keys=parent_pid: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"

reset_trigger

echo "Test histogram with compound keys"

echo 'hist:keys=parent_pid,child_pid' > events/sched/sched_process_fork/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
grep '^{ parent_pid:.*, child_pid:.*}' events/sched/sched_process_fork/hist > /dev/null || \
    fail "compound keys on sched_process_fork did not work"

reset_trigger

echo "Test histogram with string key"

echo 'hist:keys=parent_comm' > events/sched/sched_process_fork/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
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 sym modifier"

echo 'hist:keys=call_site.sym' > events/kmem/kmalloc/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
grep '{ call_site: \[[0-9a-f][0-9a-f]*\] [_a-zA-Z][_a-zA-Z]* *}' events/kmem/kmalloc/hist > /dev/null || \
    fail "sym modifier on kmalloc call_site did not work"

reset_trigger

echo "Test histogram with sym-offset modifier"

echo 'hist:keys=call_site.sym-offset' > events/kmem/kmalloc/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
grep '{ call_site: \[[0-9a-f][0-9a-f]*\] [_a-zA-Z][_a-zA-Z]*+0x[0-9a-f][0-9a-f]*' events/kmem/kmalloc/hist > /dev/null || \
    fail "sym-offset modifier on kmalloc call_site did not work"

reset_trigger

echo "Test histogram with sort key"

echo 'hist:keys=parent_pid,child_pid:sort=child_pid.ascending' > events/sched/sched_process_fork/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done

check_inc() {
    while [ $# -gt 1 ]; do
        [ $1 -gt $2 ] && return 1
        shift 1
    done
    return 0

Annotation

Implementation Notes