This adds two functions to report the metrics in /proc/self/ksm_stat and
/sys/kernel/debug/mm/ksm.
The debugging can be enabled with the following command line:
make -C tools/testing/selftests TARGETS="vm" --keep-going \
EXTRA_CFLAGS=-DDEBUG=1
Signed-off-by: Stefan Roesch <shr@xxxxxxxxxxxx>
---
tools/testing/selftests/mm/ksm_tests.c | 54 ++++++++++++++++++++++++++
1 file changed, 54 insertions(+)
diff --git a/tools/testing/selftests/mm/ksm_tests.c b/tools/testing/selftests/mm/ksm_tests.c
index a0a48ac43b29..9fb21b982dc9 100644
--- a/tools/testing/selftests/mm/ksm_tests.c
+++ b/tools/testing/selftests/mm/ksm_tests.c
@@ -93,6 +93,55 @@ static int ksm_read_sysfs(const char *file_path, unsigned long *val)
return 0;
}
+#ifdef DEBUG
+static void ksm_print_sysfs(void)
+{
+ unsigned long max_page_sharing, pages_sharing, pages_shared;
+ unsigned long full_scans, pages_unshared, pages_volatile;
+ unsigned long stable_node_chains, stable_node_dups;
+ long general_profit;
+
+ if (ksm_read_sysfs(KSM_FP("pages_shared"), &pages_shared) ||
+ ksm_read_sysfs(KSM_FP("pages_sharing"), &pages_sharing) ||
+ ksm_read_sysfs(KSM_FP("max_page_sharing"), &max_page_sharing) ||
+ ksm_read_sysfs(KSM_FP("full_scans"), &full_scans) ||
+ ksm_read_sysfs(KSM_FP("pages_unshared"), &pages_unshared) ||
+ ksm_read_sysfs(KSM_FP("pages_volatile"), &pages_volatile) ||
+ ksm_read_sysfs(KSM_FP("stable_node_chains"), &stable_node_chains) ||
+ ksm_read_sysfs(KSM_FP("stable_node_dups"), &stable_node_dups) ||
+ ksm_read_sysfs(KSM_FP("general_profit"), (unsigned long *)&general_profit))
+ return;
+
+ printf("pages_shared : %lu\n", pages_shared);
+ printf("pages_sharing : %lu\n", pages_sharing);
+ printf("max_page_sharing : %lu\n", max_page_sharing);
+ printf("full_scans : %lu\n", full_scans);
+ printf("pages_unshared : %lu\n", pages_unshared);
+ printf("pages_volatile : %lu\n", pages_volatile);
+ printf("stable_node_chains: %lu\n", stable_node_chains);
+ printf("stable_node_dups : %lu\n", stable_node_dups);
+ printf("general_profit : %ld\n", general_profit);
+}
+
+static void ksm_print_procfs(void)
+{
+ const char *file_name = "/proc/self/ksm_stat";
+ char buffer[512];
+ FILE *f = fopen(file_name, "r");
+
+ if (!f) {
+ fprintf(stderr, "f %s\n", file_name);
+ perror("fopen");
+ return;
+ }
+
+ while (fgets(buffer, sizeof(buffer), f))
+ printf("%s", buffer);
+
+ fclose(f);
+}
+#endif
+
static int str_to_prot(char *prot_str)
{
int prot = 0;
@@ -237,6 +286,11 @@ static bool assert_ksm_pages_count(long dupl_page_count)
ksm_read_sysfs(KSM_FP("max_page_sharing"), &max_page_sharing))
return false;
+#ifdef DEBUG
+ ksm_print_sysfs();
+ ksm_print_procfs();
+#endif
+
/*
* Since there must be at least 2 pages for merging and 1 page can be
* shared with the limited number of pages (max_page_sharing), sometimes
--
2.30.2
