[v2,1/2] selftests: KVM: Move dirty logging functions to memstress.(c|h)

  Move some helper functions from dirty_log_perf_test.c to the memstress
library so that they can be used in a future commit which tests page
splitting during dirty logging.

Signed-off-by: Ben Gardon <bgardon@google.com>
---
 .../selftests/kvm/dirty_log_perf_test.c       | 84 ++-----------------
 .../testing/selftests/kvm/include/memstress.h |  8 ++
 tools/testing/selftests/kvm/lib/memstress.c   | 72 ++++++++++++++++
 3 files changed, 87 insertions(+), 77 deletions(-)
  

On Mon, Jan 23, 2023 at 11:03 AM Ben Gardon <bgardon@google.com> wrote:
>
> Move some helper functions from dirty_log_perf_test.c to the memstress
> library so that they can be used in a future commit which tests page
> splitting during dirty logging.
>
> Signed-off-by: Ben Gardon <bgardon@google.com>
> ---
>  .../selftests/kvm/dirty_log_perf_test.c       | 84 ++-----------------
>  .../testing/selftests/kvm/include/memstress.h |  8 ++
>  tools/testing/selftests/kvm/lib/memstress.c   | 72 ++++++++++++++++
>  3 files changed, 87 insertions(+), 77 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/dirty_log_perf_test.c b/tools/testing/selftests/kvm/dirty_log_perf_test.c
> index e9d6d1aecf89c..416719e205183 100644
> --- a/tools/testing/selftests/kvm/dirty_log_perf_test.c
> +++ b/tools/testing/selftests/kvm/dirty_log_perf_test.c
> @@ -136,77 +136,6 @@ struct test_params {
>         bool random_access;
>  };
>
> -static void toggle_dirty_logging(struct kvm_vm *vm, int slots, bool enable)
> -{
> -       int i;
> -
> -       for (i = 0; i < slots; i++) {
> -               int slot = MEMSTRESS_MEM_SLOT_INDEX + i;
> -               int flags = enable ? KVM_MEM_LOG_DIRTY_PAGES : 0;
> -
> -               vm_mem_region_set_flags(vm, slot, flags);
> -       }
> -}
> -
> -static inline void enable_dirty_logging(struct kvm_vm *vm, int slots)
> -{
> -       toggle_dirty_logging(vm, slots, true);
> -}
> -
> -static inline void disable_dirty_logging(struct kvm_vm *vm, int slots)
> -{
> -       toggle_dirty_logging(vm, slots, false);
> -}
> -
> -static void get_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[], int slots)
> -{
> -       int i;
> -
> -       for (i = 0; i < slots; i++) {
> -               int slot = MEMSTRESS_MEM_SLOT_INDEX + i;
> -
> -               kvm_vm_get_dirty_log(vm, slot, bitmaps[i]);
> -       }
> -}
> -
> -static void clear_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[],
> -                           int slots, uint64_t pages_per_slot)
> -{
> -       int i;
> -
> -       for (i = 0; i < slots; i++) {
> -               int slot = MEMSTRESS_MEM_SLOT_INDEX + i;
> -
> -               kvm_vm_clear_dirty_log(vm, slot, bitmaps[i], 0, pages_per_slot);
> -       }
> -}
> -
> -static unsigned long **alloc_bitmaps(int slots, uint64_t pages_per_slot)
> -{
> -       unsigned long **bitmaps;
> -       int i;
> -
> -       bitmaps = malloc(slots * sizeof(bitmaps[0]));
> -       TEST_ASSERT(bitmaps, "Failed to allocate bitmaps array.");
> -
> -       for (i = 0; i < slots; i++) {
> -               bitmaps[i] = bitmap_zalloc(pages_per_slot);
> -               TEST_ASSERT(bitmaps[i], "Failed to allocate slot bitmap.");
> -       }
> -
> -       return bitmaps;
> -}
> -
> -static void free_bitmaps(unsigned long *bitmaps[], int slots)
> -{
> -       int i;
> -
> -       for (i = 0; i < slots; i++)
> -               free(bitmaps[i]);
> -
> -       free(bitmaps);
> -}
> -
>  static void run_test(enum vm_guest_mode mode, void *arg)
>  {
>         struct test_params *p = arg;
> @@ -236,7 +165,7 @@ static void run_test(enum vm_guest_mode mode, void *arg)
>         host_num_pages = vm_num_host_pages(mode, guest_num_pages);
>         pages_per_slot = host_num_pages / p->slots;
>
> -       bitmaps = alloc_bitmaps(p->slots, pages_per_slot);
> +       bitmaps = memstress_alloc_bitmaps(p->slots, pages_per_slot);
>
>         if (dirty_log_manual_caps)
>                 vm_enable_cap(vm, KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2,
> @@ -277,7 +206,7 @@ static void run_test(enum vm_guest_mode mode, void *arg)
>
>         /* Enable dirty logging */
>         clock_gettime(CLOCK_MONOTONIC, &start);
> -       enable_dirty_logging(vm, p->slots);
> +       memstress_enable_dirty_logging(vm, p->slots);
>         ts_diff = timespec_elapsed(start);
>         pr_info("Enabling dirty logging time: %ld.%.9lds\n\n",
>                 ts_diff.tv_sec, ts_diff.tv_nsec);
> @@ -306,7 +235,7 @@ static void run_test(enum vm_guest_mode mode, void *arg)
>                         iteration, ts_diff.tv_sec, ts_diff.tv_nsec);
>
>                 clock_gettime(CLOCK_MONOTONIC, &start);
> -               get_dirty_log(vm, bitmaps, p->slots);
> +               memstress_get_dirty_log(vm, bitmaps, p->slots);
>                 ts_diff = timespec_elapsed(start);
>                 get_dirty_log_total = timespec_add(get_dirty_log_total,
>                                                    ts_diff);
> @@ -315,7 +244,8 @@ static void run_test(enum vm_guest_mode mode, void *arg)
>
>                 if (dirty_log_manual_caps) {
>                         clock_gettime(CLOCK_MONOTONIC, &start);
> -                       clear_dirty_log(vm, bitmaps, p->slots, pages_per_slot);
> +                       memstress_clear_dirty_log(vm, bitmaps, p->slots,
> +                                                 pages_per_slot);
>                         ts_diff = timespec_elapsed(start);
>                         clear_dirty_log_total = timespec_add(clear_dirty_log_total,
>                                                              ts_diff);
> @@ -334,7 +264,7 @@ static void run_test(enum vm_guest_mode mode, void *arg)
>
>         /* Disable dirty logging */
>         clock_gettime(CLOCK_MONOTONIC, &start);
> -       disable_dirty_logging(vm, p->slots);
> +       memstress_disable_dirty_logging(vm, p->slots);
>         ts_diff = timespec_elapsed(start);
>         pr_info("Disabling dirty logging time: %ld.%.9lds\n",
>                 ts_diff.tv_sec, ts_diff.tv_nsec);
> @@ -359,7 +289,7 @@ static void run_test(enum vm_guest_mode mode, void *arg)
>                         clear_dirty_log_total.tv_nsec, avg.tv_sec, avg.tv_nsec);
>         }
>
> -       free_bitmaps(bitmaps, p->slots);
> +       memstress_free_bitmaps(bitmaps, p->slots);
>         arch_cleanup_vm(vm);
>         memstress_destroy_vm(vm);
>  }
> diff --git a/tools/testing/selftests/kvm/include/memstress.h b/tools/testing/selftests/kvm/include/memstress.h
> index 72e3e358ef7bd..ce4e603050eaa 100644
> --- a/tools/testing/selftests/kvm/include/memstress.h
> +++ b/tools/testing/selftests/kvm/include/memstress.h
> @@ -72,4 +72,12 @@ void memstress_guest_code(uint32_t vcpu_id);
>  uint64_t memstress_nested_pages(int nr_vcpus);
>  void memstress_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vcpus[]);
>
> +void memstress_enable_dirty_logging(struct kvm_vm *vm, int slots);
> +void memstress_disable_dirty_logging(struct kvm_vm *vm, int slots);
> +void memstress_get_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[], int slots);
> +void memstress_clear_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[],
> +                              int slots, uint64_t pages_per_slot);
> +unsigned long **memstress_alloc_bitmaps(int slots, uint64_t pages_per_slot);
> +void memstress_free_bitmaps(unsigned long *bitmaps[], int slots);
> +
>  #endif /* SELFTEST_KVM_MEMSTRESS_H */
> diff --git a/tools/testing/selftests/kvm/lib/memstress.c b/tools/testing/selftests/kvm/lib/memstress.c
> index 5f1d3173c238c..3632956c6bcf5 100644
> --- a/tools/testing/selftests/kvm/lib/memstress.c
> +++ b/tools/testing/selftests/kvm/lib/memstress.c
> @@ -5,6 +5,7 @@
>  #define _GNU_SOURCE
>
>  #include <inttypes.h>
> +#include <linux/bitmap.h>
>
>  #include "kvm_util.h"
>  #include "memstress.h"
> @@ -320,3 +321,74 @@ void memstress_join_vcpu_threads(int nr_vcpus)
>         for (i = 0; i < nr_vcpus; i++)
>                 pthread_join(vcpu_threads[i].thread, NULL);
>  }
> +
> +static void toggle_dirty_logging(struct kvm_vm *vm, int slots, bool enable)
> +{
> +       int i;
> +
> +       for (i = 0; i < slots; i++) {
> +               int slot = MEMSTRESS_MEM_SLOT_INDEX + i;
> +               int flags = enable ? KVM_MEM_LOG_DIRTY_PAGES : 0;
> +
> +               vm_mem_region_set_flags(vm, slot, flags);
> +       }
> +}
> +
> +void memstress_enable_dirty_logging(struct kvm_vm *vm, int slots)
> +{
> +       toggle_dirty_logging(vm, slots, true);
> +}
> +
> +void memstress_disable_dirty_logging(struct kvm_vm *vm, int slots)
> +{
> +       toggle_dirty_logging(vm, slots, false);
> +}

Very simple functions, maybe just make it inline in the memstress header.

> +
> +void memstress_get_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[], int slots)
> +{
> +       int i;
> +
> +       for (i = 0; i < slots; i++) {
> +               int slot = MEMSTRESS_MEM_SLOT_INDEX + i;
> +
> +               kvm_vm_get_dirty_log(vm, slot, bitmaps[i]);
> +       }
> +}
> +
> +void memstress_clear_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[],
> +                              int slots, uint64_t pages_per_slot)
> +{
> +       int i;
> +
> +       for (i = 0; i < slots; i++) {
> +               int slot = MEMSTRESS_MEM_SLOT_INDEX + i;
> +
> +               kvm_vm_clear_dirty_log(vm, slot, bitmaps[i], 0, pages_per_slot);
> +       }
> +}
> +
> +unsigned long **memstress_alloc_bitmaps(int slots, uint64_t pages_per_slot)
> +{
> +       unsigned long **bitmaps;
> +       int i;
> +
> +       bitmaps = malloc(slots * sizeof(bitmaps[0]));
> +       TEST_ASSERT(bitmaps, "Failed to allocate bitmaps array.");
> +
> +       for (i = 0; i < slots; i++) {
> +               bitmaps[i] = bitmap_zalloc(pages_per_slot);
> +               TEST_ASSERT(bitmaps[i], "Failed to allocate slot bitmap.");
> +       }
> +
> +       return bitmaps;
> +}
> +
> +void memstress_free_bitmaps(unsigned long *bitmaps[], int slots)
> +{
> +       int i;
> +
> +       for (i = 0; i < slots; i++)
> +               free(bitmaps[i]);
> +
> +       free(bitmaps);
> +}
> --
> 2.39.1.405.gd4c25cc71f-goog
>

Other than the inline suggestion, which is optional.

Reviewed-by: Vipin Sharma <vipinsh@google.com>