From: Dev Jain <dev.jain@arm.com>
To: akpm@linux-foundation.org, shuah@kernel.org
Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org, Anshuman.Khandual@arm.com,
Dev Jain <dev.jain@arm.com>
Subject: [PATCH] selftests/mm: hugetlb_madv_vs_map: Avoid test skipping by querying hugepage size at runtime
Date: Thu, 9 May 2024 15:24:47 +0530 [thread overview]
Message-ID: <20240509095447.3791573-1-dev.jain@arm.com> (raw)
Currently, the size used in mmap() is statically defined, leading to
skipping of the test on a hugepage size other than 2 MB, since munmap()
won't free the hugepage for a size greater than 2 MB. Hence, query the
size at runtime.
Also, there is no reason why a hugepage allocation should fail, since we
are using a simple mmap() using MAP_HUGETLB; hence, instead of skipping
the test, make it fail.
Signed-off-by: Dev Jain <dev.jain@arm.com>
---
tools/testing/selftests/mm/hugetlb_madv_vs_map.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/tools/testing/selftests/mm/hugetlb_madv_vs_map.c b/tools/testing/selftests/mm/hugetlb_madv_vs_map.c
index d01e8d4901d0..8f122a0f0828 100644
--- a/tools/testing/selftests/mm/hugetlb_madv_vs_map.c
+++ b/tools/testing/selftests/mm/hugetlb_madv_vs_map.c
@@ -27,9 +27,9 @@
#include "vm_util.h"
#include "../kselftest.h"
-#define MMAP_SIZE (1 << 21)
#define INLOOP_ITER 100
+size_t mmap_size;
char *huge_ptr;
/* Touch the memory while it is being madvised() */
@@ -44,7 +44,7 @@ void *touch(void *unused)
void *madv(void *unused)
{
for (int i = 0; i < INLOOP_ITER; i++)
- madvise(huge_ptr, MMAP_SIZE, MADV_DONTNEED);
+ madvise(huge_ptr, mmap_size, MADV_DONTNEED);
return NULL;
}
@@ -59,7 +59,7 @@ void *map_extra(void *unused)
void *ptr;
for (int i = 0; i < INLOOP_ITER; i++) {
- ptr = mmap(NULL, MMAP_SIZE, PROT_READ | PROT_WRITE,
+ ptr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
-1, 0);
@@ -93,14 +93,16 @@ int main(void)
free_hugepages);
}
+ mmap_size = default_huge_page_size();
+
while (max--) {
- huge_ptr = mmap(NULL, MMAP_SIZE, PROT_READ | PROT_WRITE,
+ huge_ptr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
-1, 0);
if ((unsigned long)huge_ptr == -1) {
- ksft_exit_skip("Failed to allocated huge page\n");
- return KSFT_SKIP;
+ ksft_test_result_fail("Failed to allocate huge page\n");
+ return KSFT_FAIL;
}
pthread_create(&thread1, NULL, madv, NULL);
@@ -117,7 +119,7 @@ int main(void)
}
/* Unmap and restart */
- munmap(huge_ptr, MMAP_SIZE);
+ munmap(huge_ptr, mmap_size);
}
return KSFT_PASS;
--
2.39.2
next reply other threads:[~2024-05-09 9:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-09 9:54 Dev Jain [this message]
2024-05-10 11:43 ` [PATCH] selftests/mm: hugetlb_madv_vs_map: Avoid test skipping by querying hugepage size at runtime Muhammad Usama Anjum
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