On 2/11/22 16:03, Mike Rapoport wrote:
On Fri, Feb 11, 2022 at 12:03:28PM +0530, Aneesh Kumar K.V wrote:
Keep it simple by using a #define and limiting hugepage size to 2M.
This keeps the test simpler instead of dynamically finding the page size
and huge page size.
Without this tests are broken w.r.t reading /proc/self/pagemap
if (pread(pagemap_fd, ent, sizeof(ent),
(uintptr_t)ptr >> (PAGE_SHIFT - 3)) != sizeof(ent))
err(2, "read pagemap");
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: linux-kselftest@xxxxxxxxxxxxxxx
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
---
tools/testing/selftests/vm/ksm_tests.c | 9 ++++++++-
tools/testing/selftests/vm/transhuge-stress.c | 9 ++++++++-
2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/vm/ksm_tests.c b/tools/testing/selftests/vm/ksm_tests.c
index 1436e1a9a3d3..cae72872152b 100644
--- a/tools/testing/selftests/vm/ksm_tests.c
+++ b/tools/testing/selftests/vm/ksm_tests.c
@@ -22,7 +22,14 @@
#define KSM_MERGE_ACROSS_NODES_DEFAULT true
#define MB (1ul << 20)
-#define PAGE_SHIFT 12
+#ifdef __powerpc64__
+#define PAGE_SHIFT 16
+#else
+#define PAGE_SHIFT 12
+#endif
Page size can be other than 4096 for other configurations as well. And even
on ppc64 it's not necessarily 64k.
But most common test config is with 64K page size.
Ideally page size in selftests/vm should be sysconf(_SC_PAGESIZE)
yes. As explained in commit message, the idea was to keep it simpler.
"Keep it simple by using a #define and limiting hugepage size to 2M.
This keeps the test simpler instead of dynamically finding the page size
and huge page size.
Without this tests are broken w.r.t reading /proc/self/pagemap"
We can definitely look at updating multiple tests in selftest/vm to work
with dynamic value of pagesize and huagepage size. But that can be
outside this patch?
+/*
+ * On ppc64 this will only work with radix 2M hugepage size
+ */
#define HPAGE_SHIFT 21
#define PAGE_SIZE (1 << PAGE_SHIFT)
diff --git a/tools/testing/selftests/vm/transhuge-stress.c b/tools/testing/selftests/vm/transhuge-stress.c
index 5e4c036f6ad3..b1f8d98355c5 100644
--- a/tools/testing/selftests/vm/transhuge-stress.c
+++ b/tools/testing/selftests/vm/transhuge-stress.c
@@ -16,7 +16,14 @@
#include <string.h>
#include <sys/mman.h>
-#define PAGE_SHIFT 12
+#ifdef __powerpc64__
+#define PAGE_SHIFT 16
+#else
+#define PAGE_SHIFT 12
+#endif
+/*
+ * On ppc64 this will only work with radix 2M hugepage size
+ */
#define HPAGE_SHIFT 21
#define PAGE_SIZE (1 << PAGE_SHIFT)
--
2.34.1
