Commit b348eb7a authored by SeongJae Park's avatar SeongJae Park Committed by Linus Torvalds
Browse files

mm/damon: add user space selftests 

This commit adds a simple user space tests for DAMON.  The tests are using
kselftest framework.

Link: https://lkml.kernel.org/r/20210716081449.22187-13-sj38.park@gmail.com


Signed-off-by: default avatarSeongJae Park <sjpark@amazon.de>
Reviewed-by: default avatarMarkus Boehme <markubo@amazon.de>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Amit Shah <amit@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: David Woodhouse <dwmw@amazon.com>
Cc: Fan Du <fan.du@intel.com>
Cc: Fernand Sieber <sieberf@amazon.com>
Cc: Greg Kroah-Hartman <greg@kroah.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Joe Perches <joe@perches.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Leonard Foerster <foersleo@amazon.de>
Cc: Marco Elver <elver@google.com>
Cc: Maximilian Heyne <mheyne@amazon.de>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 17ccae8b

tools/testing/selftests/damon/Makefile

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# SPDX-License-Identifier: GPL-2.0

# Makefile for damon selftests



TEST_FILES = _chk_dependency.sh

TEST_PROGS = debugfs_attrs.sh



include ../lib.mk

tools/testing/selftests/damon/_chk_dependency.sh

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#!/bin/bash

# SPDX-License-Identifier: GPL-2.0



# Kselftest framework requirement - SKIP code is 4.

ksft_skip=4



DBGFS=/sys/kernel/debug/damon



if [ $EUID -ne 0 ];

then

	echo "Run as root"

	exit $ksft_skip

fi



if [ ! -d "$DBGFS" ]

then

	echo "$DBGFS not found"

	exit $ksft_skip

fi



for f in attrs target_ids monitor_on

do

	if [ ! -f "$DBGFS/$f" ]

	then

		echo "$f not found"

		exit 1

	fi

done

tools/testing/selftests/damon/debugfs_attrs.sh

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#!/bin/bash

# SPDX-License-Identifier: GPL-2.0



test_write_result() {

	file=$1

	content=$2

	orig_content=$3

	expect_reason=$4

	expected=$5



	echo "$content" > "$file"

	if [ $? -ne "$expected" ]

	then

		echo "writing $content to $file doesn't return $expected"

		echo "expected because: $expect_reason"

		echo "$orig_content" > "$file"

		exit 1

	fi

}



test_write_succ() {

	test_write_result "$1" "$2" "$3" "$4" 0

}



test_write_fail() {

	test_write_result "$1" "$2" "$3" "$4" 1

}



test_content() {

	file=$1

	orig_content=$2

	expected=$3

	expect_reason=$4



	content=$(cat "$file")

	if [ "$content" != "$expected" ]

	then

		echo "reading $file expected $expected but $content"

		echo "expected because: $expect_reason"

		echo "$orig_content" > "$file"

		exit 1

	fi

}



source ./_chk_dependency.sh



# Test attrs file

# ===============



file="$DBGFS/attrs"

orig_content=$(cat "$file")



test_write_succ "$file" "1 2 3 4 5" "$orig_content" "valid input"

test_write_fail "$file" "1 2 3 4" "$orig_content" "no enough fields"

test_write_fail "$file" "1 2 3 5 4" "$orig_content" \

	"min_nr_regions > max_nr_regions"

test_content "$file" "$orig_content" "1 2 3 4 5" "successfully written"

echo "$orig_content" > "$file"



# Test target_ids file

# ====================



file="$DBGFS/target_ids"

orig_content=$(cat "$file")



test_write_succ "$file" "1 2 3 4" "$orig_content" "valid input"

test_write_succ "$file" "1 2 abc 4" "$orig_content" "still valid input"

test_content "$file" "$orig_content" "1 2" "non-integer was there"

test_write_succ "$file" "abc 2 3" "$orig_content" "the file allows wrong input"

test_content "$file" "$orig_content" "" "wrong input written"

test_write_succ "$file" "" "$orig_content" "empty input"

test_content "$file" "$orig_content" "" "empty input written"

echo "$orig_content" > "$file"



echo "PASS"