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Add mallctl to set and get ncached_max of each cache_bin.

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1. `thread_tcache_ncached_max_read_sizeclass` allows users to get the
    ncached_max of the bin with the input sizeclass, passed in through
    oldp (will be upper casted if not an exact bin size is given).
2. `thread_tcache_ncached_max_write` takes in a char array
    representing the settings for bins in the tcache.
This commit is contained in:
guangli-dai 2023-09-19 14:37:09 -07:00 • committed by Qi Wang
parent 6b197fdd46
commit 630f7de952
14 changed files with 477 additions and 70 deletions
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17
include/jemalloc/internal/cache_bin.h
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@ -210,6 +210,11 @@ cache_bin_info_ncached_max_get(cache_bin_t *bin, cache_bin_info_t *info) {
return info->ncached_max;
}
/* Gets ncached_max without asserting that the bin is enabled. */
static inline cache_bin_sz_t
cache_bin_ncached_max_get_unsafe(cache_bin_t *bin) {
return bin->bin_info.ncached_max;
}
/*
* Internal.
*
@ -229,7 +234,7 @@ cache_bin_assert_earlier(cache_bin_t *bin, uint16_t earlier, uint16_t later) {
* Does difference calculations that handle wraparound correctly. Earlier must
* be associated with the position earlier in memory.
*/
static inline uint16_t
static inline cache_bin_sz_t
cache_bin_diff(cache_bin_t *bin, uint16_t earlier, uint16_t later) {
cache_bin_assert_earlier(bin, earlier, later);
return later - earlier;
@ -584,19 +589,17 @@ cache_bin_nitems_get_remote(cache_bin_t *bin, cache_bin_info_t *info,
cache_bin_sz_t diff = bin->low_bits_empty -
(uint16_t)(uintptr_t)bin->stack_head;
cache_bin_sz_t n = diff / sizeof(void *);
cache_bin_sz_t ncached_max = cache_bin_info_ncached_max_get(bin, info);
assert(n <= ncached_max);
*ncached = n;
/* Racy version of cache_bin_nstashed_get_internal. */
uint16_t low_bits_low_bound = cache_bin_low_bits_low_bound_get(bin,
info);
n = (bin->low_bits_full - low_bits_low_bound) / sizeof(void *);
assert(n <= ncached_max);
*nstashed = n;
/* Note that cannot assert ncached + nstashed <= ncached_max (racy). */
/*
* Note that cannot assert anything regarding ncached_max because
* it can be configured on the fly and is thus racy.
*/
}
/*