tools/testing/selftests/mm/test_vmalloc.sh

Source file repositories/reference/linux-study-clean/tools/testing/selftests/mm/test_vmalloc.sh

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/mm/test_vmalloc.sh
Extension
.sh
Size
5180 bytes
Lines
203
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
# SPDX-License-Identifier: GPL-2.0
#
# Copyright (C) 2018 Uladzislau Rezki (Sony) <urezki@gmail.com>
#
# This is a test script for the kernel test driver to analyse vmalloc
# allocator. Therefore it is just a kernel module loader. You can specify
# and pass different parameters in order to:
#     a) analyse performance of vmalloc allocations;
#     b) stressing and stability check of vmalloc subsystem.

TEST_NAME="vmalloc"
DRIVER="test_${TEST_NAME}"
NUM_CPUS=`grep -c ^processor /proc/cpuinfo`

# Default number of times we allocate percpu objects:
NR_PCPU_OBJECTS=35000

# 1 if fails
exitcode=1

# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4

#
# Static templates for performance, stressing and smoke tests.
# Also it is possible to pass any supported parameters manualy.
#
PERF_PARAM="sequential_test_order=1 test_repeat_count=3"
SMOKE_PARAM="test_loop_count=10000 test_repeat_count=10"
STRESS_PARAM="nr_threads=$NUM_CPUS test_repeat_count=20"

PCPU_OBJ_PARAM="nr_pcpu_objects=$NR_PCPU_OBJECTS"

check_test_requirements()
{
	uid=$(id -u)
	if [ $uid -ne 0 ]; then
		echo "$0: Must be run as root"
		exit $ksft_skip
	fi

	if ! which modprobe > /dev/null 2>&1; then
		echo "$0: You need modprobe installed"
		exit $ksft_skip
	fi

	if ! modinfo $DRIVER > /dev/null 2>&1; then
		echo "$0: You must have the following enabled in your kernel:"
		echo "CONFIG_TEST_VMALLOC=m"
		exit $ksft_skip
	fi
}

check_memory_requirement()
{
	# The pcpu_alloc_test allocates nr_pcpu_objects per cpu. If the
	# PAGE_SIZE is on the larger side it is easier to set a value
	# that can cause oom events during testing. Since we are
	# testing the functionality of vmalloc and not the oom-killer,
	# calculate what is 90% of available memory and divide it by
	# the number of online CPUs.
	pages=$(($(getconf _AVPHYS_PAGES) * 90 / 100 / $NUM_CPUS))

	if (($pages < $NR_PCPU_OBJECTS)); then
		echo "Updated nr_pcpu_objects to 90% of available memory."
		echo "nr_pcpu_objects is now set to: $pages."
		PCPU_OBJ_PARAM="nr_pcpu_objects=$pages"
	fi
}

Annotation

Implementation Notes