Re: [PATCH v2 19/31] selftests/mm: Rename uffd_stats to uffd_args

From: Mike Rapoport
Date: Thu Apr 20 2023 - 06:58:55 EST

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On Wed, Apr 12, 2023 at 12:43:37PM -0400, Peter Xu wrote:
> Prepare for adding more fields into the struct.
>
> Suggested-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
> Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>

Reviewed-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>

> ---
> tools/testing/selftests/mm/uffd-common.c | 28 ++++++-------
> tools/testing/selftests/mm/uffd-common.h | 6 +--
> tools/testing/selftests/mm/uffd-stress.c | 51 ++++++++++++------------
> 3 files changed, 42 insertions(+), 43 deletions(-)
>
> diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c
> index f02dfcf10714..e746405aa8f3 100644
> --- a/tools/testing/selftests/mm/uffd-common.c
> +++ b/tools/testing/selftests/mm/uffd-common.c
> @@ -186,34 +186,34 @@ struct uffd_test_ops hugetlb_uffd_test_ops = {
> .check_pmd_mapping = NULL,
> };
>
> -void uffd_stats_report(struct uffd_stats *stats, int n_cpus)
> +void uffd_stats_report(struct uffd_args *args, int n_cpus)
> {
> int i;
> unsigned long long miss_total = 0, wp_total = 0, minor_total = 0;
>
> for (i = 0; i < n_cpus; i++) {
> - miss_total += stats[i].missing_faults;
> - wp_total += stats[i].wp_faults;
> - minor_total += stats[i].minor_faults;
> + miss_total += args[i].missing_faults;
> + wp_total += args[i].wp_faults;
> + minor_total += args[i].minor_faults;
> }
>
> printf("userfaults: ");
> if (miss_total) {
> printf("%llu missing (", miss_total);
> for (i = 0; i < n_cpus; i++)
> - printf("%lu+", stats[i].missing_faults);
> + printf("%lu+", args[i].missing_faults);
> printf("\b) ");
> }
> if (wp_total) {
> printf("%llu wp (", wp_total);
> for (i = 0; i < n_cpus; i++)
> - printf("%lu+", stats[i].wp_faults);
> + printf("%lu+", args[i].wp_faults);
> printf("\b) ");
> }
> if (minor_total) {
> printf("%llu minor (", minor_total);
> for (i = 0; i < n_cpus; i++)
> - printf("%lu+", stats[i].minor_faults);
> + printf("%lu+", args[i].minor_faults);
> printf("\b)");
> }
> printf("\n");
> @@ -397,7 +397,7 @@ int uffd_read_msg(int ufd, struct uffd_msg *msg)
> return 0;
> }
>
> -void uffd_handle_page_fault(struct uffd_msg *msg, struct uffd_stats *stats)
> +void uffd_handle_page_fault(struct uffd_msg *msg, struct uffd_args *args)
> {
> unsigned long offset;
>
> @@ -407,7 +407,7 @@ void uffd_handle_page_fault(struct uffd_msg *msg, struct uffd_stats *stats)
> if (msg->arg.pagefault.flags & UFFD_PAGEFAULT_FLAG_WP) {
> /* Write protect page faults */
> wp_range(uffd, msg->arg.pagefault.address, page_size, false);
> - stats->wp_faults++;
> + args->wp_faults++;
> } else if (msg->arg.pagefault.flags & UFFD_PAGEFAULT_FLAG_MINOR) {
> uint8_t *area;
> int b;
> @@ -430,7 +430,7 @@ void uffd_handle_page_fault(struct uffd_msg *msg, struct uffd_stats *stats)
> for (b = 0; b < page_size; ++b)
> area[b] = ~area[b];
> continue_range(uffd, msg->arg.pagefault.address, page_size);
> - stats->minor_faults++;
> + args->minor_faults++;
> } else {
> /*
> * Missing page faults.
> @@ -460,14 +460,14 @@ void uffd_handle_page_fault(struct uffd_msg *msg, struct uffd_stats *stats)
> offset &= ~(page_size-1);
>
> if (copy_page(uffd, offset))
> - stats->missing_faults++;
> + args->missing_faults++;
> }
> }
>
> void *uffd_poll_thread(void *arg)
> {
> - struct uffd_stats *stats = (struct uffd_stats *)arg;
> - unsigned long cpu = stats->cpu;
> + struct uffd_args *args = (struct uffd_args *)arg;
> + unsigned long cpu = args->cpu;
> struct pollfd pollfd[2];
> struct uffd_msg msg;
> struct uffdio_register uffd_reg;
> @@ -502,7 +502,7 @@ void *uffd_poll_thread(void *arg)
> err("unexpected msg event %u\n", msg.event);
> break;
> case UFFD_EVENT_PAGEFAULT:
> - uffd_handle_page_fault(&msg, stats);
> + uffd_handle_page_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 47565b2f2dee..f8d2ad178827 100644
> --- a/tools/testing/selftests/mm/uffd-common.h
> +++ b/tools/testing/selftests/mm/uffd-common.h
> @@ -70,7 +70,7 @@
> - 1)))
>
> /* Userfaultfd test statistics */
> -struct uffd_stats {
> +struct uffd_args {
> int cpu;
> unsigned long missing_faults;
> unsigned long wp_faults;
> @@ -98,12 +98,12 @@ extern uffd_test_ops_t shmem_uffd_test_ops;
> extern uffd_test_ops_t hugetlb_uffd_test_ops;
> extern uffd_test_ops_t *uffd_test_ops;
>
> -void uffd_stats_report(struct uffd_stats *stats, int n_cpus);
> +void uffd_stats_report(struct uffd_args *args, int n_cpus);
> void uffd_test_ctx_init(uint64_t features);
> void 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);
> -void uffd_handle_page_fault(struct uffd_msg *msg, struct uffd_stats *stats);
> +void uffd_handle_page_fault(struct uffd_msg *msg, struct uffd_args *args);
> int __copy_page(int ufd, unsigned long offset, bool retry);
> int copy_page(int ufd, unsigned long offset);
> void *uffd_poll_thread(void *arg);
> diff --git a/tools/testing/selftests/mm/uffd-stress.c b/tools/testing/selftests/mm/uffd-stress.c
> index 54fc9b4ffa3c..ce7251ab93ef 100644
> --- a/tools/testing/selftests/mm/uffd-stress.c
> +++ b/tools/testing/selftests/mm/uffd-stress.c
> @@ -90,16 +90,15 @@ static void usage(void)
> exit(1);
> }
>
> -static void uffd_stats_reset(struct uffd_stats *uffd_stats,
> - unsigned long n_cpus)
> +static void uffd_stats_reset(struct uffd_args *args, unsigned long n_cpus)
> {
> int i;
>
> for (i = 0; i < n_cpus; i++) {
> - uffd_stats[i].cpu = i;
> - uffd_stats[i].missing_faults = 0;
> - uffd_stats[i].wp_faults = 0;
> - uffd_stats[i].minor_faults = 0;
> + args[i].cpu = i;
> + args[i].missing_faults = 0;
> + args[i].wp_faults = 0;
> + args[i].minor_faults = 0;
> }
> }
>
> @@ -163,7 +162,7 @@ pthread_mutex_t uffd_read_mutex = PTHREAD_MUTEX_INITIALIZER;
>
> static void *uffd_read_thread(void *arg)
> {
> - struct uffd_stats *stats = (struct uffd_stats *)arg;
> + struct uffd_args *args = (struct uffd_args *)arg;
> struct uffd_msg msg;
>
> pthread_mutex_unlock(&uffd_read_mutex);
> @@ -172,7 +171,7 @@ static void *uffd_read_thread(void *arg)
> for (;;) {
> if (uffd_read_msg(uffd, &msg))
> continue;
> - uffd_handle_page_fault(&msg, stats);
> + uffd_handle_page_fault(&msg, args);
> }
>
> return NULL;
> @@ -210,7 +209,7 @@ static void *background_thread(void *arg)
> return NULL;
> }
>
> -static int stress(struct uffd_stats *uffd_stats)
> +static int stress(struct uffd_args *args)
> {
> unsigned long cpu;
> pthread_t locking_threads[nr_cpus];
> @@ -225,12 +224,12 @@ static int stress(struct uffd_stats *uffd_stats)
> if (bounces & BOUNCE_POLL) {
> if (pthread_create(&uffd_threads[cpu], &attr,
> uffd_poll_thread,
> - (void *)&uffd_stats[cpu]))
> + (void *)&args[cpu]))
> return 1;
> } else {
> if (pthread_create(&uffd_threads[cpu], &attr,
> uffd_read_thread,
> - (void *)&uffd_stats[cpu]))
> + (void *)&args[cpu]))
> return 1;
> pthread_mutex_lock(&uffd_read_mutex);
> }
> @@ -264,7 +263,7 @@ static int stress(struct uffd_stats *uffd_stats)
> if (write(pipefd[cpu*2+1], &c, 1) != 1)
> err("pipefd write error");
> if (pthread_join(uffd_threads[cpu],
> - (void *)&uffd_stats[cpu]))
> + (void *)&args[cpu]))
> return 1;
> } else {
> if (pthread_cancel(uffd_threads[cpu]))
> @@ -493,7 +492,7 @@ static int userfaultfd_events_test(void)
> int err, features;
> pid_t pid;
> char c;
> - struct uffd_stats stats = { 0 };
> + struct uffd_args args = { 0 };
>
> printf("testing events (fork, remap, remove): ");
> fflush(stdout);
> @@ -508,7 +507,7 @@ static int userfaultfd_events_test(void)
> true, test_uffdio_wp, false))
> err("register failure");
>
> - if (pthread_create(&uffd_mon, &attr, uffd_poll_thread, &stats))
> + if (pthread_create(&uffd_mon, &attr, uffd_poll_thread, &args))
> err("uffd_poll_thread create");
>
> pid = fork();
> @@ -526,9 +525,9 @@ static int userfaultfd_events_test(void)
> if (pthread_join(uffd_mon, NULL))
> return 1;
>
> - uffd_stats_report(&stats, 1);
> + uffd_stats_report(&args, 1);
>
> - return stats.missing_faults != nr_pages;
> + return args.missing_faults != nr_pages;
> }
>
> static int userfaultfd_sig_test(void)
> @@ -538,7 +537,7 @@ static int userfaultfd_sig_test(void)
> int err, features;
> pid_t pid;
> char c;
> - struct uffd_stats stats = { 0 };
> + struct uffd_args args = { 0 };
>
> printf("testing signal delivery: ");
> fflush(stdout);
> @@ -557,7 +556,7 @@ static int userfaultfd_sig_test(void)
>
> uffd_test_ops->release_pages(area_dst);
>
> - if (pthread_create(&uffd_mon, &attr, uffd_poll_thread, &stats))
> + if (pthread_create(&uffd_mon, &attr, uffd_poll_thread, &args))
> err("uffd_poll_thread create");
>
> pid = fork();
> @@ -606,7 +605,7 @@ static int userfaultfd_minor_test(void)
> unsigned long p;
> pthread_t uffd_mon;
> char c;
> - struct uffd_stats stats = { 0 };
> + struct uffd_args args = { 0 };
>
> if (!test_uffdio_minor)
> return 0;
> @@ -629,7 +628,7 @@ static int userfaultfd_minor_test(void)
> page_size);
> }
>
> - if (pthread_create(&uffd_mon, &attr, uffd_poll_thread, &stats))
> + if (pthread_create(&uffd_mon, &attr, uffd_poll_thread, &args))
> err("uffd_poll_thread create");
>
> /*
> @@ -645,7 +644,7 @@ static int userfaultfd_minor_test(void)
> if (pthread_join(uffd_mon, NULL))
> return 1;
>
> - uffd_stats_report(&stats, 1);
> + uffd_stats_report(&args, 1);
>
> if (test_collapse) {
> printf("testing collapse of uffd memory into PMD-mapped THPs:");
> @@ -664,7 +663,7 @@ static int userfaultfd_minor_test(void)
> printf(" done.\n");
> }
>
> - return stats.missing_faults != 0 || stats.minor_faults != nr_pages;
> + return args.missing_faults != 0 || args.minor_faults != nr_pages;
> }
>
> static int pagemap_open(void)
> @@ -822,7 +821,7 @@ static int userfaultfd_stress(void)
> {
> void *area;
> unsigned long nr;
> - struct uffd_stats uffd_stats[nr_cpus];
> + struct uffd_args args[nr_cpus];
> uint64_t mem_size = nr_pages * page_size;
>
> uffd_test_ctx_init(UFFD_FEATURE_WP_UNPOPULATED);
> @@ -894,10 +893,10 @@ static int userfaultfd_stress(void)
> */
> uffd_test_ops->release_pages(area_dst);
>
> - uffd_stats_reset(uffd_stats, nr_cpus);
> + uffd_stats_reset(args, nr_cpus);
>
> /* bounce pass */
> - if (stress(uffd_stats))
> + if (stress(args))
> return 1;
>
> /* Clear all the write protections if there is any */
> @@ -926,7 +925,7 @@ static int userfaultfd_stress(void)
>
> swap(area_src_alias, area_dst_alias);
>
> - uffd_stats_report(uffd_stats, nr_cpus);
> + uffd_stats_report(args, nr_cpus);
> }
>
> if (test_type == TEST_ANON) {
> --
> 2.39.1
>

--
Sincerely yours,
Mike.

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