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Date: Mon, 11 Oct 2021 02:59:07 -0300
From: Pedro Demarchi Gomes <pedrodemargomes@...il.com>
To: unlisted-recipients:; (no To-header on input)
Cc: pedrodemargomes@...il.com,
Andrew Morton <akpm@...ux-foundation.org>,
Shuah Khan <shuah@...nel.org>, linux-mm@...ck.org,
linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] selftests: vm: add KSM huge pages merging time test
Signed-off-by: Pedro Demarchi Gomes <pedrodemargomes@...il.com>
---
tools/testing/selftests/vm/ksm_tests.c | 40 +++++++++++++++++++-------
1 file changed, 30 insertions(+), 10 deletions(-)
diff --git a/tools/testing/selftests/vm/ksm_tests.c b/tools/testing/selftests/vm/ksm_tests.c
index b61dcdb44c5b..92b716565d9c 100644
--- a/tools/testing/selftests/vm/ksm_tests.c
+++ b/tools/testing/selftests/vm/ksm_tests.c
@@ -5,6 +5,7 @@
#include <time.h>
#include <string.h>
#include <numa.h>
+#include <err.h>
#include "../kselftest.h"
#include "../../../../include/vdso/time64.h"
@@ -34,7 +35,8 @@ enum ksm_test_name {
CHECK_KSM_ZERO_PAGE_MERGE,
CHECK_KSM_NUMA_MERGE,
KSM_MERGE_TIME,
- KSM_COW_TIME
+ KSM_COW_TIME,
+ KSM_MERGE_TIME_HUGE_PAGES
};
static int ksm_write_sysfs(const char *file_path, unsigned long val)
@@ -99,6 +101,9 @@ static void print_help(void)
" -U (page unmerging)\n"
" -P evaluate merging time and speed.\n"
" For this test, the size of duplicated memory area (in MiB)\n"
+ " must be provided using -s option\n"
+ " -H evaluate merging time and speed of huge pages.\n"
+ " For this test, the size of duplicated memory area (in MiB)\n"
" must be provided using -s option\n"
" -C evaluate the time required to break COW of merged pages.\n\n");
@@ -118,10 +123,14 @@ static void print_help(void)
exit(0);
}
-static void *allocate_memory(void *ptr, int prot, int mapping, char data, size_t map_size)
+static void *allocate_memory(void *ptr, int prot, int mapping, char data, size_t map_size,
+ bool huge_page)
{
void *map_ptr = mmap(ptr, map_size, PROT_WRITE, mapping, -1, 0);
+ if (huge_page && madvise(map_ptr, map_size, MADV_HUGEPAGE))
+ err(2, "MADV_HUGEPAGE");
+
if (!map_ptr) {
perror("mmap");
return NULL;
@@ -250,7 +259,7 @@ static int check_ksm_merge(int mapping, int prot, long page_count, int timeout,
}
/* fill pages with the same data and merge them */
- map_ptr = allocate_memory(NULL, prot, mapping, '*', page_size * page_count);
+ map_ptr = allocate_memory(NULL, prot, mapping, '*', page_size * page_count, false);
if (!map_ptr)
return KSFT_FAIL;
@@ -282,7 +291,7 @@ static int check_ksm_unmerge(int mapping, int prot, int timeout, size_t page_siz
}
/* fill pages with the same data and merge them */
- map_ptr = allocate_memory(NULL, prot, mapping, '*', page_size * page_count);
+ map_ptr = allocate_memory(NULL, prot, mapping, '*', page_size * page_count, false);
if (!map_ptr)
return KSFT_FAIL;
@@ -325,7 +334,7 @@ static int check_ksm_zero_page_merge(int mapping, int prot, long page_count, int
return KSFT_FAIL;
/* fill pages with zero and try to merge them */
- map_ptr = allocate_memory(NULL, prot, mapping, 0, page_size * page_count);
+ map_ptr = allocate_memory(NULL, prot, mapping, 0, page_size * page_count, false);
if (!map_ptr)
return KSFT_FAIL;
@@ -416,7 +425,7 @@ static int check_ksm_numa_merge(int mapping, int prot, int timeout, bool merge_a
return KSFT_FAIL;
}
-static int ksm_merge_time(int mapping, int prot, int timeout, size_t map_size)
+static int ksm_merge_time(int mapping, int prot, int timeout, size_t map_size, bool huge_page)
{
void *map_ptr;
struct timespec start_time, end_time;
@@ -424,7 +433,7 @@ static int ksm_merge_time(int mapping, int prot, int timeout, size_t map_size)
map_size *= MB;
- map_ptr = allocate_memory(NULL, prot, mapping, '*', map_size);
+ map_ptr = allocate_memory(NULL, prot, mapping, '*', map_size, huge_page);
if (!map_ptr)
return KSFT_FAIL;
@@ -466,7 +475,7 @@ static int ksm_cow_time(int mapping, int prot, int timeout, size_t page_size)
/* page_count must be less than 2*page_size */
size_t page_count = 4000;
- map_ptr = allocate_memory(NULL, prot, mapping, '*', page_size * page_count);
+ map_ptr = allocate_memory(NULL, prot, mapping, '*', page_size * page_count, false);
if (!map_ptr)
return KSFT_FAIL;
@@ -541,7 +550,7 @@ int main(int argc, char *argv[])
bool merge_across_nodes = KSM_MERGE_ACROSS_NODES_DEFAULT;
long size_MB = 0;
- while ((opt = getopt(argc, argv, "ha:p:l:z:m:s:MUZNPC")) != -1) {
+ while ((opt = getopt(argc, argv, "ha:p:l:z:m:s:MUZNPCH")) != -1) {
switch (opt) {
case 'a':
prot = str_to_prot(optarg);
@@ -598,6 +607,9 @@ int main(int argc, char *argv[])
case 'C':
test_name = KSM_COW_TIME;
break;
+ case 'H':
+ test_name = KSM_MERGE_TIME_HUGE_PAGES;
+ break;
default:
return KSFT_FAIL;
}
@@ -645,12 +657,20 @@ int main(int argc, char *argv[])
return KSFT_FAIL;
}
ret = ksm_merge_time(MAP_PRIVATE | MAP_ANONYMOUS, prot, ksm_scan_limit_sec,
- size_MB);
+ size_MB, false);
break;
case KSM_COW_TIME:
ret = ksm_cow_time(MAP_PRIVATE | MAP_ANONYMOUS, prot, ksm_scan_limit_sec,
page_size);
break;
+ case KSM_MERGE_TIME_HUGE_PAGES:
+ if (size_MB == 0) {
+ printf("Option '-s' is required.\n");
+ return KSFT_FAIL;
+ }
+ ret = ksm_merge_time(MAP_PRIVATE | MAP_ANONYMOUS, prot, ksm_scan_limit_sec,
+ size_MB, true);
+ break;
}
if (ksm_restore(&ksm_sysfs_old)) {
--
2.25.1
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