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Message-Id: <20220113180308.15610-4-mike.kravetz@oracle.com>
Date: Thu, 13 Jan 2022 10:03:08 -0800
From: Mike Kravetz <mike.kravetz@...cle.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc: Michal Hocko <mhocko@...e.com>,
Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
Axel Rasmussen <axelrasmussen@...gle.com>,
Peter Xu <peterx@...hat.com>,
Andrea Arcangeli <aarcange@...hat.com>,
Mina Almasry <almasrymina@...gle.com>,
Shuah Khan <shuah@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Mike Kravetz <mike.kravetz@...cle.com>
Subject: [RFC PATCH 3/3] userfaultfd/selftests: enable huegtlb remap and remove event testing
With MADV_DONTNEED support added to hugetlb mappings, mremap testing
can also be enabled for hugetlb.
Modify the tests to use madvise MADV_DONTNEED and MADV_REMOVE instead of
fallocate hole puch for releasing hugetlb pages.
Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>
---
tools/testing/selftests/vm/userfaultfd.c | 67 ++++++++++++------------
1 file changed, 34 insertions(+), 33 deletions(-)
diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index 0b543a9a42b2..226f385158df 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -88,7 +88,6 @@ static bool test_uffdio_minor = false;
static bool map_shared;
static int shm_fd;
static int huge_fd;
-static char *huge_fd_off0;
static unsigned long long *count_verify;
static int uffd = -1;
static int uffd_flags, finished, *pipefd;
@@ -124,9 +123,9 @@ const char *examples =
"./userfaultfd anon 100 99999\n\n"
"# Run share memory test on 1GiB region with 99 bounces:\n"
"./userfaultfd shmem 1000 99\n\n"
- "# Run hugetlb memory test on 256MiB region with 50 bounces (using /dev/hugepages/hugefile):\n"
+ "# Run hugetlb memory test on 256MiB region with 50 bounces:\n"
"./userfaultfd hugetlb 256 50 /dev/hugepages/hugefile\n\n"
- "# Run the same hugetlb test but using shmem:\n"
+ "# Run the same hugetlb test but using shared file:\n"
"./userfaultfd hugetlb_shared 256 50 /dev/hugepages/hugefile\n\n"
"# 10MiB-~6GiB 999 bounces anonymous test, "
"continue forever unless an error triggers\n"
@@ -223,10 +222,13 @@ static void noop_alias_mapping(__u64 *start, size_t len, unsigned long offset)
static void hugetlb_release_pages(char *rel_area)
{
- if (fallocate(huge_fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
- rel_area == huge_fd_off0 ? 0 : nr_pages * page_size,
- nr_pages * page_size))
- err("fallocate() failed");
+ if (!map_shared) {
+ if (madvise(rel_area, nr_pages * page_size, MADV_DONTNEED))
+ err("madvise(MADV_DONTNEED) failed");
+ } else {
+ if (madvise(rel_area, nr_pages * page_size, MADV_REMOVE))
+ err("madvise(MADV_REMOVE) failed");
+ }
}
static void hugetlb_allocate_area(void **alloc_area)
@@ -234,26 +236,37 @@ static void hugetlb_allocate_area(void **alloc_area)
void *area_alias = NULL;
char **alloc_area_alias;
- *alloc_area = mmap(NULL, nr_pages * page_size, PROT_READ | PROT_WRITE,
- (map_shared ? MAP_SHARED : MAP_PRIVATE) |
- MAP_HUGETLB |
- (*alloc_area == area_src ? 0 : MAP_NORESERVE),
- huge_fd, *alloc_area == area_src ? 0 :
- nr_pages * page_size);
+ if (!map_shared)
+ *alloc_area = mmap(NULL,
+ nr_pages * page_size,
+ PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB |
+ (*alloc_area == area_src ? 0 : MAP_NORESERVE),
+ -1,
+ 0);
+ else
+ *alloc_area = mmap(NULL,
+ nr_pages * page_size,
+ PROT_READ | PROT_WRITE,
+ MAP_SHARED |
+ (*alloc_area == area_src ? 0 : MAP_NORESERVE),
+ huge_fd,
+ *alloc_area == area_src ? 0 : nr_pages * page_size);
if (*alloc_area == MAP_FAILED)
err("mmap of hugetlbfs file failed");
if (map_shared) {
- area_alias = mmap(NULL, nr_pages * page_size, PROT_READ | PROT_WRITE,
- MAP_SHARED | MAP_HUGETLB,
- huge_fd, *alloc_area == area_src ? 0 :
- nr_pages * page_size);
+ area_alias = mmap(NULL,
+ nr_pages * page_size,
+ PROT_READ | PROT_WRITE,
+ MAP_SHARED,
+ huge_fd,
+ *alloc_area == area_src ? 0 : nr_pages * page_size);
if (area_alias == MAP_FAILED)
err("mmap of hugetlb file alias failed");
}
if (*alloc_area == area_src) {
- huge_fd_off0 = *alloc_area;
alloc_area_alias = &area_src_alias;
} else {
alloc_area_alias = &area_dst_alias;
@@ -266,12 +279,7 @@ static void hugetlb_alias_mapping(__u64 *start, size_t len, unsigned long offset
{
if (!map_shared)
return;
- /*
- * We can't zap just the pagetable with hugetlbfs because
- * MADV_DONTEED won't work. So exercise -EEXIST on a alias
- * mapping where the pagetables are not established initially,
- * this way we'll exercise the -EEXEC at the fs level.
- */
+
*start = (unsigned long) area_dst_alias + offset;
}
@@ -424,7 +432,6 @@ static void uffd_test_ctx_clear(void)
uffd = -1;
}
- huge_fd_off0 = NULL;
munmap_area((void **)&area_src);
munmap_area((void **)&area_src_alias);
munmap_area((void **)&area_dst);
@@ -919,10 +926,7 @@ static int faulting_process(int signal_test)
struct sigaction act;
unsigned long signalled = 0;
- if (test_type != TEST_HUGETLB)
- split_nr_pages = (nr_pages + 1) / 2;
- else
- split_nr_pages = nr_pages;
+ split_nr_pages = (nr_pages + 1) / 2;
if (signal_test) {
sigbuf = &jbuf;
@@ -979,9 +983,6 @@ static int faulting_process(int signal_test)
if (signal_test)
return signalled != split_nr_pages;
- if (test_type == TEST_HUGETLB)
- return 0;
-
area_dst = mremap(area_dst, nr_pages * page_size, nr_pages * page_size,
MREMAP_MAYMOVE | MREMAP_FIXED, area_src);
if (area_dst == MAP_FAILED)
@@ -1669,7 +1670,7 @@ int main(int argc, char **argv)
}
nr_pages = nr_pages_per_cpu * nr_cpus;
- if (test_type == TEST_HUGETLB) {
+ if (test_type == TEST_HUGETLB && map_shared) {
if (argc < 5)
usage();
huge_fd = open(argv[4], O_CREAT | O_RDWR, 0755);
--
2.34.1
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