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

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc
Extension
.tc
Size
1668 bytes
Lines
51
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 modifiers
# 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 with execname modifier"

echo 'hist:keys=common_pid.execname' > events/sched/sched_process_fork/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
COMM=`cat /proc/$$/comm`
grep "common_pid: $COMM" events/sched/sched_process_fork/hist > /dev/null || \
    fail "execname modifier on sched_process_fork did not work"

reset_trigger

echo "Test histogram with hex modifier"

echo 'hist:keys=parent_pid.hex' > events/sched/sched_process_fork/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
# Note that $$ is the parent pid. $PID is current PID.
HEX=`printf %x $PID`
grep "parent_pid: $HEX" events/sched/sched_process_fork/hist > /dev/null || \
    fail "hex modifier on sched_process_fork did not work"

reset_trigger

echo "Test histogram with syscall modifier"

echo 'hist:keys=id.syscall' > events/raw_syscalls/sys_exit/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
grep "id: \(unknown_\|sys_\)" events/raw_syscalls/sys_exit/hist > /dev/null || \
    fail "syscall modifier on raw_syscalls/sys_exit did not work"


reset_trigger

echo "Test histogram with log2 modifier"

echo 'hist:keys=bytes_req.log2' > events/kmem/kmalloc/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
grep 'bytes_req: ~ 2^[0-9]*' events/kmem/kmalloc/hist > /dev/null || \
    fail "log2 modifier on kmem/kmalloc did not work"

exit 0

Annotation

Implementation Notes