project-base/server-skynet-source-3rd-jemalloc
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Make cache_bin_sz_t unsigned.

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The bin size type was made signed only because the low_water could go -1, which
was already removed.
This commit is contained in:
Qi Wang 2019-08-30 11:52:15 -07:00 committed by Qi Wang
parent 23dc7a7fba
commit 785b84e603
2 changed files with 8 additions and 10 deletions
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16
include/jemalloc/internal/cache_bin.h
View File

@ -13,12 +13,8 @@
* of the tcache at all.
*/
/*
* The count of the number of cached allocations in a bin. We make this signed
* so that negative numbers can encode "invalid" states (e.g. a low water mark
* of -1 for a cache that has been depleted).
*/
typedef int32_t cache_bin_sz_t;
/* The size in bytes of each cache bin stack. */
typedef uint16_t cache_bin_sz_t;
typedef struct cache_bin_stats_s cache_bin_stats_t;
struct cache_bin_stats_s {
@ -126,7 +122,7 @@ static inline cache_bin_sz_t
cache_bin_ncached_get(cache_bin_t *bin, szind_t ind) {
cache_bin_sz_t n = (tcache_bin_info[ind].stack_size +
bin->full_position - bin->cur_ptr.lowbits) / sizeof(void *);
assert(n >= 0 && n <= cache_bin_ncached_max_get(ind));
assert(n <= cache_bin_ncached_max_get(ind));
assert(n == 0 || *(bin->cur_ptr.ptr) != NULL);
return n;
@ -157,13 +153,13 @@ cache_bin_bottom_item_get(cache_bin_t *bin, szind_t ind) {
return bottom;
}
/* Returns the numeric value of low water in [-1, ncached]. */
/* Returns the numeric value of low water in [0, ncached]. */
static inline cache_bin_sz_t
cache_bin_low_water_get(cache_bin_t *bin, szind_t ind) {
cache_bin_sz_t ncached_max = cache_bin_ncached_max_get(ind);
cache_bin_sz_t low_water = ncached_max -
(bin->low_water_position - bin->full_position) / sizeof(void *);
assert(low_water >= 0 && low_water <= ncached_max);
assert(low_water <= ncached_max);
assert(low_water <= cache_bin_ncached_get(bin, ind));
assert(bin->low_water_position >= bin->cur_ptr.lowbits);
@ -174,7 +170,7 @@ static inline void
cache_bin_ncached_set(cache_bin_t *bin, szind_t ind, cache_bin_sz_t n) {
bin->cur_ptr.lowbits = bin->full_position +
tcache_bin_info[ind].stack_size - n * sizeof(void *);
assert(n >= 0 && n <= cache_bin_ncached_max_get(ind));
assert(n <= cache_bin_ncached_max_get(ind));
assert(n == 0 || *bin->cur_ptr.ptr != NULL);
}

2
src/tcache.c
View File

@ -825,6 +825,8 @@ tcache_boot(tsdn_t *tsdn) {
ncached_max = TCACHE_NSLOTS_SMALL_MAX;
}
unsigned stack_size = ncached_max * sizeof(void *);
assert(stack_size < ((uint64_t)1 <<
(sizeof(cache_bin_sz_t) * 8)));
tcache_bin_info[i].stack_size = stack_size;
total_stack_bytes += stack_size;
}