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Add a batch mode for cache_bin_alloc()

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This commit is contained in:
Yinan Zhang 2020-10-22 16:07:25 -07:00
parent 4a65f34930
commit be5e49f4fa
2 changed files with 65 additions and 0 deletions
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12
include/jemalloc/internal/cache_bin.h
View File

@ -317,6 +317,18 @@ cache_bin_alloc(cache_bin_t *bin, bool *success) {
return cache_bin_alloc_impl(bin, success, true);
}
JEMALLOC_ALWAYS_INLINE cache_bin_sz_t
cache_bin_alloc_batch(cache_bin_t *bin, size_t num, void **out) {
size_t n = cache_bin_ncached_get_internal(bin);
if (n > num) {
n = num;
}
memcpy(out, bin->stack_head, n * sizeof(void *));
bin->stack_head += n;
cache_bin_low_water_adjust(bin);
return n;
}
/*
* Free an object into the given bin. Fails only if the bin is full.
*/

53
test/unit/cache_bin.c
View File

@ -52,6 +52,34 @@ do_flush_test(cache_bin_t *bin, cache_bin_info_t *info, void **ptrs,
}
}
static void
do_batch_alloc_test(cache_bin_t *bin, cache_bin_info_t *info, void **ptrs,
cache_bin_sz_t nfill, size_t batch) {
assert_true(cache_bin_ncached_get(bin, info) == 0, "");
CACHE_BIN_PTR_ARRAY_DECLARE(arr, nfill);
cache_bin_init_ptr_array_for_fill(bin, info, &arr, nfill);
for (cache_bin_sz_t i = 0; i < nfill; i++) {
arr.ptr[i] = &ptrs[i];
}
cache_bin_finish_fill(bin, info, &arr, nfill);
assert_true(cache_bin_ncached_get(bin, info) == nfill, "");
cache_bin_low_water_set(bin);
void **out = malloc((batch + 1) * sizeof(void *));
size_t n = cache_bin_alloc_batch(bin, batch, out);
assert_true(n == ((size_t)nfill < batch ? (size_t)nfill : batch), "");
for (cache_bin_sz_t i = 0; i < (cache_bin_sz_t)n; i++) {
expect_ptr_eq(out[i], &ptrs[i], "");
}
expect_true(cache_bin_low_water_get(bin, info) == nfill -
(cache_bin_sz_t)n, "");
while (cache_bin_ncached_get(bin, info) > 0) {
bool success;
cache_bin_alloc(bin, &success);
}
free(out);
}
TEST_BEGIN(test_cache_bin) {
const int ncached_max = 100;
bool success;
@ -197,6 +225,31 @@ TEST_BEGIN(test_cache_bin) {
do_flush_test(&bin, &info, ptrs, ncached_max / 2, ncached_max / 4);
do_flush_test(&bin, &info, ptrs, ncached_max / 2, 0);
do_batch_alloc_test(&bin, &info, ptrs, ncached_max, ncached_max);
do_batch_alloc_test(&bin, &info, ptrs, ncached_max, ncached_max * 2);
do_batch_alloc_test(&bin, &info, ptrs, ncached_max, ncached_max / 2);
do_batch_alloc_test(&bin, &info, ptrs, ncached_max, 2);
do_batch_alloc_test(&bin, &info, ptrs, ncached_max, 1);
do_batch_alloc_test(&bin, &info, ptrs, ncached_max, 0);
do_batch_alloc_test(&bin, &info, ptrs, ncached_max / 2,
ncached_max / 2);
do_batch_alloc_test(&bin, &info, ptrs, ncached_max / 2, ncached_max);
do_batch_alloc_test(&bin, &info, ptrs, ncached_max / 2,
ncached_max / 4);
do_batch_alloc_test(&bin, &info, ptrs, ncached_max / 2, 2);
do_batch_alloc_test(&bin, &info, ptrs, ncached_max / 2, 1);
do_batch_alloc_test(&bin, &info, ptrs, ncached_max / 2, 0);
do_batch_alloc_test(&bin, &info, ptrs, 2, ncached_max);
do_batch_alloc_test(&bin, &info, ptrs, 2, 2);
do_batch_alloc_test(&bin, &info, ptrs, 2, 1);
do_batch_alloc_test(&bin, &info, ptrs, 2, 0);
do_batch_alloc_test(&bin, &info, ptrs, 1, 2);
do_batch_alloc_test(&bin, &info, ptrs, 1, 1);
do_batch_alloc_test(&bin, &info, ptrs, 1, 0);
do_batch_alloc_test(&bin, &info, ptrs, 0, 2);
do_batch_alloc_test(&bin, &info, ptrs, 0, 1);
do_batch_alloc_test(&bin, &info, ptrs, 0, 0);
free(ptrs);
}
TEST_END