The patch titled
Subject: selftests/damon: implement a program for even-numbered memory regions access
has been added to the -mm mm-unstable branch. Its filename is
selftests-damon-implement-a-program-for-even-numbered-memory-regions-access.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-damon-implement-a-program-for-even-numbered-memory-regions-access.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
Subject: selftests/damon: implement a program for even-numbered memory regions access
Date: Tue, 25 Jun 2024 11:05:33 -0700
To test schemes_tried_regions feature, we need to have a program having
specific number of regions that having different access pattern. Existing
artificial access pattern generator, 'access_memory', cannot be used for
the purpose, since it accesses only one region at a given time. Extending
it could be an option, but since the purpose and the implementation are
pretty simple, implementing another one from the scratch is better.
Implement such another artificial memory access program that allocates
user-defined number/size regions and accesses even-numbered regions.
Link: https://lkml.kernel.org/r/20240625180538.73134-4-sj@xxxxxxxxxx
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/damon/Makefile | 2
tools/testing/selftests/damon/access_memory_even.c | 42 +++++++++++
2 files changed, 43 insertions(+), 1 deletion(-)
--- /dev/null
+++ a/tools/testing/selftests/damon/access_memory_even.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Artificial memory access program for testing DAMON.
+ *
+ * Receives number of regions and size of each region from user. Allocate the
+ * regions and repeatedly access even numbered (starting from zero) regions.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+int main(int argc, char *argv[])
+{
+ char **regions;
+ clock_t start_clock;
+ int nr_regions;
+ int sz_region;
+ int access_time_ms;
+ int i;
+
+ if (argc != 3) {
+ printf("Usage: %s <number> <size (bytes)>\n", argv[0]);
+ return -1;
+ }
+
+ nr_regions = atoi(argv[1]);
+ sz_region = atoi(argv[2]);
+
+ regions = malloc(sizeof(*regions) * nr_regions);
+ for (i = 0; i < nr_regions; i++)
+ regions[i] = malloc(sz_region);
+
+ while (1) {
+ for (i = 0; i < nr_regions; i++) {
+ if (i % 2 == 0)
+ memset(regions[i], i, sz_region);
+ }
+ }
+ return 0;
+}
--- a/tools/testing/selftests/damon/Makefile~selftests-damon-implement-a-program-for-even-numbered-memory-regions-access
+++ a/tools/testing/selftests/damon/Makefile
@@ -4,7 +4,7 @@
TEST_GEN_FILES += huge_count_read_write
TEST_GEN_FILES += debugfs_target_ids_read_before_terminate_race
TEST_GEN_FILES += debugfs_target_ids_pid_leak
-TEST_GEN_FILES += access_memory
+TEST_GEN_FILES += access_memory access_memory_even
TEST_FILES = _chk_dependency.sh _debugfs_common.sh
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
mm-damon-core-merge-regions-aggressively-when-max_nr_regions-is-unmet.patch
docs-mm-damon-maintainer-profile-introduce-hackermail.patch
docs-mm-damon-maintainer-profile-document-damon-community-meetups.patch
selftests-damon-access_memory-use-user-defined-region-size.patch
selftests-damon-_damon_sysfs-support-schemes_update_tried_regions.patch
selftests-damon-implement-a-program-for-even-numbered-memory-regions-access.patch
selftests-damon-implement-damos-tried-regions-test.patch
selftests-damon-_damon_sysfs-implement-kdamonds-stop-function.patch
selftests-damon-implement-test-for-min-max_nr_regions.patch
_damon_sysfs-implement-commit-for-online-parameters-update.patch
selftests-damon-damon_nr_regions-test-online-tuned-max_nr_regions.patch
