tools/perf/tests/shell/record_offcpu.sh

Source file repositories/reference/linux-study-clean/tools/perf/tests/shell/record_offcpu.sh

File Facts

System
Linux kernel
Corpus path
tools/perf/tests/shell/record_offcpu.sh
Extension
.sh
Size
4514 bytes
Lines
175
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/bash
# perf record offcpu profiling tests (exclusive)
# SPDX-License-Identifier: GPL-2.0

set -e

err=0
perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)

ts=$(printf "%u" $((~0 << 32))) # OFF_CPU_TIMESTAMP
dummy_timestamp=${ts%???} # remove the last 3 digits to match perf script

cleanup() {
  rm -f ${perfdata}
  rm -f ${perfdata}.old
  trap - EXIT TERM INT
}

trap_cleanup() {
  cleanup
  exit 1
}
trap trap_cleanup EXIT TERM INT

test_above_thresh="Threshold test (above threshold)"
test_below_thresh="Threshold test (below threshold)"

test_offcpu_priv() {
  echo "Checking off-cpu privilege"

  if [ "$(id -u)" != 0 ]
  then
    echo "off-cpu test [Skipped permission]"
    err=2
    return
  fi
  if perf version --build-options 2>&1 | grep HAVE_BPF_SKEL | grep -q OFF
  then
    echo "off-cpu test [Skipped missing BPF support]"
    err=2
    return
  fi
}

test_offcpu_basic() {
  echo "Basic off-cpu test"

  if ! perf record --off-cpu -e dummy -o ${perfdata} sleep 1 2> /dev/null
  then
    echo "Basic off-cpu test [Failed record]"
    err=1
    return
  fi
  if ! perf evlist -i ${perfdata} | grep -q "offcpu-time"
  then
    echo "Basic off-cpu test [Failed no event]"
    err=1
    return
  fi
  if ! perf report -i ${perfdata} -q --percent-limit=90 | grep -E -q sleep
  then
    echo "Basic off-cpu test [Failed missing output]"
    err=1
    return
  fi
  echo "Basic off-cpu test [Success]"
}

test_offcpu_child() {
  echo "Child task off-cpu test"

Annotation

Implementation Notes