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Add support for sharded bins within an arena.

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This makes it possible to have multiple set of bins in an arena, which improves
arena scalability because the bins (especially the small ones) are always the
limiting factor in production workload.

A bin shard is picked on allocation; each extent tracks the bin shard id for
deallocation.  The shard size will be determined using runtime options.
This commit is contained in:
Qi Wang
2018-11-12 15:56:04 -08:00
committed by Qi Wang
parent b23336af96
commit 37b8913925
12 changed files with 217 additions and 73 deletions
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6
src/bin.c
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@@ -6,6 +6,9 @@
#include "jemalloc/internal/sc.h"
#include "jemalloc/internal/witness.h"
unsigned opt_bin_shard_maxszind;
unsigned opt_n_bin_shards;
bin_info_t bin_infos[SC_NBINS];
void
@@ -18,6 +21,7 @@ bin_infos_init(sc_data_t *sc_data, bin_info_t bin_infos[SC_NBINS]) {
bin_info->slab_size = (sc->pgs << LG_PAGE);
bin_info->nregs =
(uint32_t)(bin_info->slab_size / bin_info->reg_size);
bin_info->n_shards = (i < opt_bin_shard_maxszind) ? opt_n_bin_shards : 1;
bitmap_info_t bitmap_info = BITMAP_INFO_INITIALIZER(
bin_info->nregs);
bin_info->bitmap_info = bitmap_info;
@@ -27,6 +31,8 @@ bin_infos_init(sc_data_t *sc_data, bin_info_t bin_infos[SC_NBINS]) {
void
bin_boot(sc_data_t *sc_data) {
assert(sc_data->initialized);
opt_bin_shard_maxszind = OPT_BIN_SHARD_MAXSZIND;
opt_n_bin_shards = OPT_N_BIN_SHARDS;
bin_infos_init(sc_data, bin_infos);
}