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userfaultfd/selftests: enable hugetlb remap and remove event testing

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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.

Link: https://lkml.kernel.org/r/20220215002348.128823-4-mike.kravetz@oracle.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev>
Cc: Peter Xu <peterx@redhat.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Kravetz 2022-03-24 18:13:24 -07:00 committed by Linus Torvalds
parent c4b6cb8840
commit 9ae8f2b849
2 changed files with 36 additions and 36 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
tools/testing/selftests/vm/run_vmtests.sh
View file

@ -208,14 +208,13 @@ echo "running userfaultfd_hugetlb"
echo "---------------------------"
# Test requires source and destination huge pages. Size of source
# (half_ufd_size_MB) is passed as argument to test.
./userfaultfd hugetlb $half_ufd_size_MB 32 $mnt/ufd_test_file
./userfaultfd hugetlb $half_ufd_size_MB 32
if [ $? -ne 0 ]; then
echo "[FAIL]"
exitcode=1
else
echo "[PASS]"
fi
rm -f $mnt/ufd_test_file
echo "-------------------------"
echo "running userfaultfd_shmem"

69
tools/testing/selftests/vm/userfaultfd.c
View file

@ -89,7 +89,6 @@ 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;
@ -128,9 +127,9 @@ 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"
"./userfaultfd hugetlb 256 50 /dev/hugepages/hugefile\n\n"
"# Run the same hugetlb test but using shmem:\n"
"# Run hugetlb memory test on 256MiB region with 50 bounces:\n"
"./userfaultfd hugetlb 256 50\n\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"
@ -227,10 +226,13 @@ 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)
@ -238,26 +240,37 @@ 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;
@ -270,12 +283,7 @@ 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;
}
@ -428,7 +436,6 @@ 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);
@ -926,10 +933,7 @@ 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;
@ -986,9 +990,6 @@ 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)
@ -1676,7 +1677,7 @@ 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);