| Message ID | 20230707215540.2324998-8-axelrasmussen@google.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | add UFFDIO_POISON to simulate memory poisoning with UFFD | expand |
On Fri, Jul 07, 2023 at 02:55:39PM -0700, Axel Rasmussen wrote: > Previously, we had "one fault handler to rule them all", which used > several branches to deal with all of the scenarios required by all of > the various tests. > > In upcoming patches, I plan to add a new test, which has its own > slightly different fault handling logic. Instead of continuing to add > cruft to the existing fault handler, let's allow tests to define custom > ones, separate from other tests. > > Signed-off-by: Axel Rasmussen <axelrasmussen@google.com> Acked-by: Peter Xu <peterx@redhat.com> PS: please remember to update manpage after it lands. I still have a plan to update but not yet happening; if you happen to update before mine please feel free to update for whatever is missing. Thanks!
On Sat, Jul 8, 2023 at 8:02 AM Peter Xu <peterx@redhat.com> wrote: > > On Fri, Jul 07, 2023 at 02:55:39PM -0700, Axel Rasmussen wrote: > > Previously, we had "one fault handler to rule them all", which used > > several branches to deal with all of the scenarios required by all of > > the various tests. > > > > In upcoming patches, I plan to add a new test, which has its own > > slightly different fault handling logic. Instead of continuing to add > > cruft to the existing fault handler, let's allow tests to define custom > > ones, separate from other tests. > > > > Signed-off-by: Axel Rasmussen <axelrasmussen@google.com> > > Acked-by: Peter Xu <peterx@redhat.com> > > PS: please remember to update manpage after it lands. I still have a plan > to update but not yet happening; if you happen to update before mine please > feel free to update for whatever is missing. Will do! > > Thanks! > > -- > Peter Xu >
diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c index ba20d7504022..02b89860e193 100644 --- a/tools/testing/selftests/mm/uffd-common.c +++ b/tools/testing/selftests/mm/uffd-common.c @@ -499,6 +499,9 @@ void *uffd_poll_thread(void *arg) int ret; char tmp_chr; + if (!args->handle_fault) + args->handle_fault = uffd_handle_page_fault; + pollfd[0].fd = uffd; pollfd[0].events = POLLIN; pollfd[1].fd = pipefd[cpu*2]; @@ -527,7 +530,7 @@ void *uffd_poll_thread(void *arg) err("unexpected msg event %u\n", msg.event); break; case UFFD_EVENT_PAGEFAULT: - uffd_handle_page_fault(&msg, args); + args->handle_fault(&msg, args); break; case UFFD_EVENT_FORK: close(uffd); diff --git a/tools/testing/selftests/mm/uffd-common.h b/tools/testing/selftests/mm/uffd-common.h index 197f5262fe0d..7c4fa964c3b0 100644 --- a/tools/testing/selftests/mm/uffd-common.h +++ b/tools/testing/selftests/mm/uffd-common.h @@ -77,6 +77,9 @@ struct uffd_args { unsigned long missing_faults; unsigned long wp_faults; unsigned long minor_faults; + + /* A custom fault handler; defaults to uffd_handle_page_fault. */ + void (*handle_fault)(struct uffd_msg *msg, struct uffd_args *args); }; struct uffd_test_ops { diff --git a/tools/testing/selftests/mm/uffd-stress.c b/tools/testing/selftests/mm/uffd-stress.c index 995ff13e74c7..73ebb97c7026 100644 --- a/tools/testing/selftests/mm/uffd-stress.c +++ b/tools/testing/selftests/mm/uffd-stress.c @@ -189,10 +189,8 @@ static int stress(struct uffd_args *args) locking_thread, (void *)cpu)) return 1; if (bounces & BOUNCE_POLL) { - if (pthread_create(&uffd_threads[cpu], &attr, - uffd_poll_thread, - (void *)&args[cpu])) - return 1; + if (pthread_create(&uffd_threads[cpu], &attr, uffd_poll_thread, &args[cpu])) + err("uffd_poll_thread create"); } else { if (pthread_create(&uffd_threads[cpu], &attr, uffd_read_thread, @@ -250,6 +248,8 @@ static int userfaultfd_stress(void) struct uffd_args args[nr_cpus]; uint64_t mem_size = nr_pages * page_size; + memset(args, 0, sizeof(struct uffd_args) * nr_cpus); + if (uffd_test_ctx_init(UFFD_FEATURE_WP_UNPOPULATED, NULL)) err("context init failed");
Previously, we had "one fault handler to rule them all", which used several branches to deal with all of the scenarios required by all of the various tests. In upcoming patches, I plan to add a new test, which has its own slightly different fault handling logic. Instead of continuing to add cruft to the existing fault handler, let's allow tests to define custom ones, separate from other tests. Signed-off-by: Axel Rasmussen <axelrasmussen@google.com> --- tools/testing/selftests/mm/uffd-common.c | 5 ++++- tools/testing/selftests/mm/uffd-common.h | 3 +++ tools/testing/selftests/mm/uffd-stress.c | 8 ++++---- 3 files changed, 11 insertions(+), 5 deletions(-)