[v4,08/15] tests: Add test code for meta bitmap

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
---
 tests/test-hbitmap.c | 116 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)

On 08.03.2016 05:44, Fam Zheng wrote:
> Signed-off-by: Fam Zheng <famz@redhat.com>
> Reviewed-by: John Snow <jsnow@redhat.com>
> ---
>  tests/test-hbitmap.c | 116 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 116 insertions(+)
> 
> diff --git a/tests/test-hbitmap.c b/tests/test-hbitmap.c
> index abe1427..c00c2b5 100644
> --- a/tests/test-hbitmap.c
> +++ b/tests/test-hbitmap.c
> @@ -12,6 +12,7 @@
>  #include "qemu/osdep.h"
>  #include <glib.h>
>  #include "qemu/hbitmap.h"
> +#include "block/block.h"
>  
>  #define LOG_BITS_PER_LONG          (BITS_PER_LONG == 32 ? 5 : 6)
>  
> @@ -21,6 +22,7 @@
>  
>  typedef struct TestHBitmapData {
>      HBitmap       *hb;
> +    HBitmap       *meta;
>      unsigned long *bits;
>      size_t         size;
>      size_t         old_size;
> @@ -92,6 +94,14 @@ static void hbitmap_test_init(TestHBitmapData *data,
>      }
>  }
>  
> +static void hbitmap_test_init_meta(TestHBitmapData *data,
> +                                   uint64_t size, int granularity,
> +                                   int meta_chunk)
> +{
> +    hbitmap_test_init(data, size, granularity);
> +    data->meta = hbitmap_create_meta(data->hb, meta_chunk);
> +}
> +
>  static inline size_t hbitmap_test_array_size(size_t bits)
>  {
>      size_t n = (bits + BITS_PER_LONG - 1) / BITS_PER_LONG;
> @@ -134,6 +144,9 @@ static void hbitmap_test_teardown(TestHBitmapData *data,
>                                    const void *unused)
>  {
>      if (data->hb) {
> +        if (data->meta) {
> +            hbitmap_free_meta(data->hb);
> +        }
>          hbitmap_free(data->hb);
>          data->hb = NULL;
>      }
> @@ -635,6 +648,103 @@ static void test_hbitmap_truncate_shrink_large(TestHBitmapData *data,
>      hbitmap_test_truncate(data, size, -diff, 0);
>  }
>  
> +static void hbitmap_check_meta(TestHBitmapData *data,
> +                               int64_t start, int count)
> +{
> +    int64_t i;
> +
> +    for (i = 0; i < data->size; i++) {
> +        if (i >= start && i < start + count) {
> +            g_assert(hbitmap_get(data->meta, i));
> +        } else {
> +            g_assert(!hbitmap_get(data->meta, i));
> +        }
> +    }
> +}
> +
> +static void hbitmap_test_meta(TestHBitmapData *data,
> +                              int64_t start, int count,
> +                              int64_t check_start, int check_count)
> +{
> +    hbitmap_reset_all(data->hb);
> +    hbitmap_reset_all(data->meta);
> +
> +    /* Test "unset" -> "unset" will not update meta. */
> +    hbitmap_reset(data->hb, start, count);
> +    hbitmap_check_meta(data, 0, 0);
> +
> +    /* Test "unset" -> "set" will update meta */
> +    hbitmap_set(data->hb, start, count);
> +    hbitmap_check_meta(data, check_start, check_count);
> +
> +    /* Test "set" -> "set" will not update meta */
> +    hbitmap_reset_all(data->meta);
> +    hbitmap_set(data->hb, start, count);
> +    hbitmap_check_meta(data, 0, 0);

Well, but if you'd do an hbitmap_set(data->hb, start, count + 1), then
it would update meta, right?

I forgot to mention in my reply to patch 7 that the check whether
anything in the range passed to hbitmap_set() has been changed in order
to determine whether all of that range should be set in the meta bitmap
seemed a bit excessive. I don't think this will hurt anyone, but still.

(So this is not a NACK, just a question.)

Max

> +
> +    /* Test "set" -> "unset" will update meta */
> +    hbitmap_reset_all(data->meta);
> +    hbitmap_reset(data->hb, start, count);
> +    hbitmap_check_meta(data, check_start, check_count);
> +}
> +
> +static void hbitmap_test_meta_do(TestHBitmapData *data, int chunk_size)
> +{
> +    uint64_t size = chunk_size * 100;
> +    hbitmap_test_init_meta(data, size, 0, chunk_size);
> +
> +    hbitmap_test_meta(data, 0, 1, 0, chunk_size);
> +    hbitmap_test_meta(data, 0, chunk_size, 0, chunk_size);
> +    hbitmap_test_meta(data, chunk_size - 1, 1, 0, chunk_size);
> +    hbitmap_test_meta(data, chunk_size - 1, 2, 0, chunk_size * 2);
> +    hbitmap_test_meta(data, chunk_size - 1, chunk_size + 1, 0, chunk_size * 2);
> +    hbitmap_test_meta(data, chunk_size - 1, chunk_size + 2, 0, chunk_size * 3);
> +    hbitmap_test_meta(data, 7 * chunk_size - 1, chunk_size + 2,
> +                      6 * chunk_size, chunk_size * 3);
> +    hbitmap_test_meta(data, size - 1, 1, size - chunk_size, chunk_size);
> +    hbitmap_test_meta(data, 0, size, 0, size);
> +}
> +
> +static void test_hbitmap_meta_byte(TestHBitmapData *data, const void *unused)
> +{
> +    hbitmap_test_meta_do(data, BITS_PER_BYTE);
> +}
> +
> +static void test_hbitmap_meta_word(TestHBitmapData *data, const void *unused)
> +{
> +    hbitmap_test_meta_do(data, BITS_PER_LONG);
> +}
> +
> +static void test_hbitmap_meta_sector(TestHBitmapData *data, const void *unused)
> +{
> +    hbitmap_test_meta_do(data, BDRV_SECTOR_SIZE * BITS_PER_BYTE);
> +}
> +
> +/**
> + * Create an HBitmap and test set/unset.
> + */
> +static void test_hbitmap_meta_one(TestHBitmapData *data, const void *unused)
> +{
> +    int i;
> +    int64_t offsets[] = {
> +        0, 1, L1 - 1, L1, L1 + 1, L2 - 1, L2, L2 + 1, L3 - 1, L3, L3 + 1
> +    };
> +
> +    hbitmap_test_init_meta(data, L3 * 2, 0, 1);
> +    for (i = 0; i < ARRAY_SIZE(offsets); i++) {
> +        hbitmap_test_meta(data, offsets[i], 1, offsets[i], 1);
> +        hbitmap_test_meta(data, offsets[i], L1, offsets[i], L1);
> +        hbitmap_test_meta(data, offsets[i], L2, offsets[i], L2);
> +    }
> +}
> +
> +static void test_hbitmap_meta_zero(TestHBitmapData *data, const void *unused)
> +{
> +    hbitmap_test_init_meta(data, 0, 0, 1);
> +
> +    hbitmap_check_meta(data, 0, 0);
> +}
> +
>  static void hbitmap_test_add(const char *testpath,
>                                     void (*test_func)(TestHBitmapData *data, const void *user_data))
>  {
> @@ -684,6 +794,12 @@ int main(int argc, char **argv)
>                       test_hbitmap_truncate_grow_large);
>      hbitmap_test_add("/hbitmap/truncate/shrink/large",
>                       test_hbitmap_truncate_shrink_large);
> +
> +    hbitmap_test_add("/hbitmap/meta/zero", test_hbitmap_meta_zero);
> +    hbitmap_test_add("/hbitmap/meta/one", test_hbitmap_meta_one);
> +    hbitmap_test_add("/hbitmap/meta/byte", test_hbitmap_meta_byte);
> +    hbitmap_test_add("/hbitmap/meta/word", test_hbitmap_meta_word);
> +    hbitmap_test_add("/hbitmap/meta/sector", test_hbitmap_meta_sector);
>      g_test_run();
>  
>      return 0;
>

On Fri, 03/11 15:58, Max Reitz wrote:
> > +    /* Test "unset" -> "set" will update meta */
> > +    hbitmap_set(data->hb, start, count);
> > +    hbitmap_check_meta(data, check_start, check_count);
> > +
> > +    /* Test "set" -> "set" will not update meta */
> > +    hbitmap_reset_all(data->meta);
> > +    hbitmap_set(data->hb, start, count);
> > +    hbitmap_check_meta(data, 0, 0);
> 
> Well, but if you'd do an hbitmap_set(data->hb, start, count + 1), then
> it would update meta, right?

Yes.

> 
> I forgot to mention in my reply to patch 7 that the check whether
> anything in the range passed to hbitmap_set() has been changed in order
> to determine whether all of that range should be set in the meta bitmap
> seemed a bit excessive. I don't think this will hurt anyone, but still.

It is. It has been on my list to optimize the unnecessary meta update away but
I haven't done that yet.

Fam

> 
> (So this is not a NACK, just a question.)
> 
> Max
>