| Message ID | 20231028003819.652322-4-surenb@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | userfaultfd move option | expand |
On Fri, Oct 27, 2023 at 05:38:13PM -0700, Suren Baghdasaryan wrote: > uffd_test_ctx_clear() is being called from uffd_test_ctx_init() to unmap > areas used in the previous test run. This approach is problematic because > while unmapping areas uffd_test_ctx_clear() uses page_size and nr_pages > which might differ from one test run to another. > Fix this by calling uffd_test_ctx_clear() after each test is done. > > Signed-off-by: Suren Baghdasaryan <surenb@google.com> Reviewed-by: Peter Xu <peterx@redhat.com>
On Mon, Oct 30, 2023 at 1:14 PM Peter Xu <peterx@redhat.com> wrote: > > On Fri, Oct 27, 2023 at 05:38:13PM -0700, Suren Baghdasaryan wrote: > > uffd_test_ctx_clear() is being called from uffd_test_ctx_init() to unmap > > areas used in the previous test run. This approach is problematic because > > while unmapping areas uffd_test_ctx_clear() uses page_size and nr_pages > > which might differ from one test run to another. > > Fix this by calling uffd_test_ctx_clear() after each test is done. > > > > Signed-off-by: Suren Baghdasaryan <surenb@google.com> > > Reviewed-by: Peter Xu <peterx@redhat.com> Looks correct to me as well. Thanks for fixing this, Suren! Reviewed-by: Axel Rasmussen <axelrasmussen@google.com> > > -- > Peter Xu >
diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c index 02b89860e193..583e5a4cc0fd 100644 --- a/tools/testing/selftests/mm/uffd-common.c +++ b/tools/testing/selftests/mm/uffd-common.c @@ -262,7 +262,7 @@ static inline void munmap_area(void **area) *area = NULL; } -static void uffd_test_ctx_clear(void) +void uffd_test_ctx_clear(void) { size_t i; @@ -298,8 +298,6 @@ int uffd_test_ctx_init(uint64_t features, const char **errmsg) unsigned long nr, cpu; int ret; - uffd_test_ctx_clear(); - ret = uffd_test_ops->allocate_area((void **)&area_src, true); ret |= uffd_test_ops->allocate_area((void **)&area_dst, false); if (ret) { diff --git a/tools/testing/selftests/mm/uffd-common.h b/tools/testing/selftests/mm/uffd-common.h index 7c4fa964c3b0..870776b5a323 100644 --- a/tools/testing/selftests/mm/uffd-common.h +++ b/tools/testing/selftests/mm/uffd-common.h @@ -105,6 +105,7 @@ extern uffd_test_ops_t *uffd_test_ops; void uffd_stats_report(struct uffd_args *args, int n_cpus); int uffd_test_ctx_init(uint64_t features, const char **errmsg); +void uffd_test_ctx_clear(void); int userfaultfd_open(uint64_t *features); int uffd_read_msg(int ufd, struct uffd_msg *msg); void wp_range(int ufd, __u64 start, __u64 len, bool wp); diff --git a/tools/testing/selftests/mm/uffd-stress.c b/tools/testing/selftests/mm/uffd-stress.c index 469e0476af26..7e83829bbb33 100644 --- a/tools/testing/selftests/mm/uffd-stress.c +++ b/tools/testing/selftests/mm/uffd-stress.c @@ -323,8 +323,10 @@ static int userfaultfd_stress(void) uffd_stats_reset(args, nr_cpus); /* bounce pass */ - if (stress(args)) + if (stress(args)) { + uffd_test_ctx_clear(); return 1; + } /* Clear all the write protections if there is any */ if (test_uffdio_wp) @@ -354,6 +356,7 @@ static int userfaultfd_stress(void) uffd_stats_report(args, nr_cpus); } + uffd_test_ctx_clear(); return 0; } diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c index 2709a34a39c5..e7d43c198041 100644 --- a/tools/testing/selftests/mm/uffd-unit-tests.c +++ b/tools/testing/selftests/mm/uffd-unit-tests.c @@ -1319,6 +1319,7 @@ int main(int argc, char *argv[]) continue; } test->uffd_fn(&args); + uffd_test_ctx_clear(); } }
uffd_test_ctx_clear() is being called from uffd_test_ctx_init() to unmap areas used in the previous test run. This approach is problematic because while unmapping areas uffd_test_ctx_clear() uses page_size and nr_pages which might differ from one test run to another. Fix this by calling uffd_test_ctx_clear() after each test is done. Signed-off-by: Suren Baghdasaryan <surenb@google.com> --- tools/testing/selftests/mm/uffd-common.c | 4 +--- tools/testing/selftests/mm/uffd-common.h | 1 + tools/testing/selftests/mm/uffd-stress.c | 5 ++++- tools/testing/selftests/mm/uffd-unit-tests.c | 1 + 4 files changed, 7 insertions(+), 4 deletions(-)