These files:
tools/testing/selftests/vm/vm_util.c
tools/testing/selftests/vm/khugepaged.c
Both contain logic to:
1) Determine hugepage size on current system
2) Read /proc/self/smaps to determine number of THPs at an address
Refactor selftests/vm/khugepaged.c to use the vm_util common helpers
and add it as a build dependency.
Since selftests/vm/khugepaged.c is the largest user of check_huge(),
change the signature of check_huge() to match
selftests/vm/khugepaged.c's useage: take an expected number of
hugepages, and return a bool indicating if the correct number of
hugepages were found. Add a wrapper, check_huge_anon(), in anticipation
of checking smaps for file and shmem hugepages.
Update existing callsites to use the new pattern / function.
Likewise, check_for_pattern() was duplicated, and it's a general enough
helper to include in vm_util helpers as well.
Signed-off-by: Zach O'Keefe <zokeefe@xxxxxxxxxx>
---
tools/testing/selftests/vm/Makefile | 1 +
tools/testing/selftests/vm/khugepaged.c | 64 ++-----------------
tools/testing/selftests/vm/soft-dirty.c | 2 +-
.../selftests/vm/split_huge_page_test.c | 12 ++--
tools/testing/selftests/vm/vm_util.c | 26 +++++---
tools/testing/selftests/vm/vm_util.h | 3 +-
6 files changed, 32 insertions(+), 76 deletions(-)
diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile
index d9fa6a9ea584..33716ba4d63b 100644
--- a/tools/testing/selftests/vm/Makefile
+++ b/tools/testing/selftests/vm/Makefile
@@ -97,6 +97,7 @@ TEST_FILES += va_128TBswitch.sh
include ../lib.mk
+$(OUTPUT)/khugepaged: vm_util.c
$(OUTPUT)/madv_populate: vm_util.c
$(OUTPUT)/soft-dirty: vm_util.c
$(OUTPUT)/split_huge_page_test: vm_util.c
diff --git a/tools/testing/selftests/vm/khugepaged.c b/tools/testing/selftests/vm/khugepaged.c
index b77b1e28cdb3..e5c602f7a18b 100644
--- a/tools/testing/selftests/vm/khugepaged.c
+++ b/tools/testing/selftests/vm/khugepaged.c
@@ -11,6 +11,8 @@
#include <sys/mman.h>
#include <sys/wait.h>
+#include "vm_util.h"
+
#ifndef MADV_PAGEOUT
#define MADV_PAGEOUT 21
#endif
@@ -351,64 +353,12 @@ static void save_settings(void)
signal(SIGQUIT, restore_settings);
}
-#define MAX_LINE_LENGTH 500
-
-static bool check_for_pattern(FILE *fp, char *pattern, char *buf)
-{
- while (fgets(buf, MAX_LINE_LENGTH, fp) != NULL) {
- if (!strncmp(buf, pattern, strlen(pattern)))
- return true;
- }
- return false;
-}
-
static bool check_huge(void *addr, int nr_hpages)
{
- bool thp = false;
- int ret;
- FILE *fp;
- char buffer[MAX_LINE_LENGTH];
- char addr_pattern[MAX_LINE_LENGTH];
-
- ret = snprintf(addr_pattern, MAX_LINE_LENGTH, "%08lx-",
- (unsigned long) addr);
- if (ret >= MAX_LINE_LENGTH) {
- printf("%s: Pattern is too long\n", __func__);
- exit(EXIT_FAILURE);
- }
-
-
- fp = fopen(PID_SMAPS, "r");
- if (!fp) {
- printf("%s: Failed to open file %s\n", __func__, PID_SMAPS);
- exit(EXIT_FAILURE);
- }
- if (!check_for_pattern(fp, addr_pattern, buffer))
- goto err_out;
-
- ret = snprintf(addr_pattern, MAX_LINE_LENGTH, "AnonHugePages:%10ld kB",
- nr_hpages * (hpage_pmd_size >> 10));
- if (ret >= MAX_LINE_LENGTH) {
- printf("%s: Pattern is too long\n", __func__);
- exit(EXIT_FAILURE);
- }
- /*
- * Fetch the AnonHugePages: in the same block and check whether it got
- * the expected number of hugeepages next.
- */
- if (!check_for_pattern(fp, "AnonHugePages:", buffer))
- goto err_out;
-
- if (strncmp(buffer, addr_pattern, strlen(addr_pattern)))
- goto err_out;
-
- thp = true;
-err_out:
- fclose(fp);
- return thp;
+ return check_huge_anon(addr, nr_hpages, hpage_pmd_size);
}
-
+#define MAX_LINE_LENGTH 500
static bool check_swap(void *addr, unsigned long size)
{
bool swap = false;
@@ -430,7 +380,7 @@ static bool check_swap(void *addr, unsigned long size)
printf("%s: Failed to open file %s\n", __func__, PID_SMAPS);
exit(EXIT_FAILURE);
}
- if (!check_for_pattern(fp, addr_pattern, buffer))
+ if (!check_for_pattern(fp, addr_pattern, buffer, sizeof(buffer)))
goto err_out;
ret = snprintf(addr_pattern, MAX_LINE_LENGTH, "Swap:%19ld kB",
@@ -443,7 +393,7 @@ static bool check_swap(void *addr, unsigned long size)
* Fetch the Swap: in the same block and check whether it got
* the expected number of hugeepages next.
*/
- if (!check_for_pattern(fp, "Swap:", buffer))
+ if (!check_for_pattern(fp, "Swap:", buffer, sizeof(buffer)))
goto err_out;
if (strncmp(buffer, addr_pattern, strlen(addr_pattern)))
@@ -1045,7 +995,7 @@ int main(int argc, const char **argv)
setbuf(stdout, NULL);
page_size = getpagesize();
- hpage_pmd_size = read_num("hpage_pmd_size");
+ hpage_pmd_size = read_pmd_pagesize();
hpage_pmd_nr = hpage_pmd_size / page_size;
default_settings.khugepaged.max_ptes_none = hpage_pmd_nr - 1;
diff --git a/tools/testing/selftests/vm/soft-dirty.c b/tools/testing/selftests/vm/soft-dirty.c
index e3a43f5d4fa2..21d8830c5f24 100644
--- a/tools/testing/selftests/vm/soft-dirty.c
+++ b/tools/testing/selftests/vm/soft-dirty.c
@@ -91,7 +91,7 @@ static void test_hugepage(int pagemap_fd, int pagesize)
for (i = 0; i < hpage_len; i++)
map[i] = (char)i;
- if (check_huge(map)) {
+ if (check_huge_anon(map, 1, hpage_len)) {
ksft_test_result_pass("Test %s huge page allocation\n", __func__);
clear_softdirty();
diff --git a/tools/testing/selftests/vm/split_huge_page_test.c b/tools/testing/selftests/vm/split_huge_page_test.c
index 6aa2b8253aed..76e1c36dd9e5 100644
--- a/tools/testing/selftests/vm/split_huge_page_test.c
+++ b/tools/testing/selftests/vm/split_huge_page_test.c
@@ -92,7 +92,6 @@ void split_pmd_thp(void)
{
char *one_page;
size_t len = 4 * pmd_pagesize;
- uint64_t thp_size;
size_t i;
one_page = memalign(pmd_pagesize, len);
@@ -107,8 +106,7 @@ void split_pmd_thp(void)
for (i = 0; i < len; i++)
one_page[i] = (char)i;
- thp_size = check_huge(one_page);
- if (!thp_size) {
+ if (!check_huge_anon(one_page, 1, pmd_pagesize)) {
printf("No THP is allocated\n");
exit(EXIT_FAILURE);
}
@@ -124,9 +122,8 @@ void split_pmd_thp(void)
}
- thp_size = check_huge(one_page);
- if (thp_size) {
- printf("Still %ld kB AnonHugePages not split\n", thp_size);
+ if (check_huge_anon(one_page, 0, pmd_pagesize)) {
+ printf("Still AnonHugePages not split\n");
exit(EXIT_FAILURE);
}
@@ -172,8 +169,7 @@ void split_pte_mapped_thp(void)
for (i = 0; i < len; i++)
one_page[i] = (char)i;
- thp_size = check_huge(one_page);
- if (!thp_size) {
+ if (!check_huge_anon(one_page, 1, pmd_pagesize)) {
printf("No THP is allocated\n");
exit(EXIT_FAILURE);
}
diff --git a/tools/testing/selftests/vm/vm_util.c b/tools/testing/selftests/vm/vm_util.c
index b58ab11a7a30..9dae51b8219f 100644
--- a/tools/testing/selftests/vm/vm_util.c
+++ b/tools/testing/selftests/vm/vm_util.c
@@ -42,9 +42,9 @@ void clear_softdirty(void)
ksft_exit_fail_msg("writing clear_refs failed\n");
}
-static bool check_for_pattern(FILE *fp, const char *pattern, char *buf)
+bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len)
{
- while (fgets(buf, MAX_LINE_LENGTH, fp) != NULL) {
+ while (fgets(buf, len, fp)) {
if (!strncmp(buf, pattern, strlen(pattern)))
return true;
}
@@ -72,9 +72,10 @@ uint64_t read_pmd_pagesize(void)
return strtoul(buf, NULL, 10);
}
-uint64_t check_huge(void *addr)
+bool __check_huge(void *addr, char *pattern, int nr_hpages,
+ uint64_t hpage_size)
{
- uint64_t thp = 0;
+ uint64_t thp = -1;
int ret;
FILE *fp;
char buffer[MAX_LINE_LENGTH];
@@ -89,20 +90,27 @@ uint64_t check_huge(void *addr)
if (!fp)
ksft_exit_fail_msg("%s: Failed to open file %s\n", __func__, SMAP_FILE_PATH);
- if (!check_for_pattern(fp, addr_pattern, buffer))
+ if (!check_for_pattern(fp, addr_pattern, buffer, sizeof(buffer)))
goto err_out;
/*
- * Fetch the AnonHugePages: in the same block and check the number of
+ * Fetch the pattern in the same block and check the number of
* hugepages.
*/
- if (!check_for_pattern(fp, "AnonHugePages:", buffer))
+ if (!check_for_pattern(fp, pattern, buffer, sizeof(buffer)))
goto err_out;
- if (sscanf(buffer, "AnonHugePages:%10ld kB", &thp) != 1)
+ snprintf(addr_pattern, MAX_LINE_LENGTH, "%s%%9ld kB", pattern);
+
+ if (sscanf(buffer, addr_pattern, &thp) != 1)
ksft_exit_fail_msg("Reading smap error\n");
err_out:
fclose(fp);
- return thp;
+ return thp == (nr_hpages * (hpage_size >> 10));
+}
+
+bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size)
+{
+ return __check_huge(addr, "AnonHugePages: ", nr_hpages, hpage_size);
}
diff --git a/tools/testing/selftests/vm/vm_util.h b/tools/testing/selftests/vm/vm_util.h
index 2e512bd57ae1..8434ea0c95cd 100644
--- a/tools/testing/selftests/vm/vm_util.h
+++ b/tools/testing/selftests/vm/vm_util.h
@@ -5,5 +5,6 @@
uint64_t pagemap_get_entry(int fd, char *start);
bool pagemap_is_softdirty(int fd, char *start);
void clear_softdirty(void);
+bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len);
uint64_t read_pmd_pagesize(void);
-uint64_t check_huge(void *addr);
+bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size);
--
2.37.1.559.g78731f0fdb-goog
