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Add a hard limit on tcache max size class.

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For locality reasons, tcache bins are integrated in TSD.  Allowing all size
classes to be cached has little benefit, but takes up much thread local storage.
In addition, it complicates the layout which we try hard to optimize.
This commit is contained in:
Qi Wang 2020-10-15 16:37:16 -07:00 committed by Qi Wang
parent 3de19ba401
commit 5e41ff9b74
4 changed files with 14 additions and 9 deletions
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4
doc/jemalloc.xml.in
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@ -1314,8 +1314,8 @@ malloc_conf = "xmalloc:true";]]></programlisting>
</term>
<listitem><para>Maximum size class (log base 2) to cache in the
thread-specific cache (tcache). At a minimum, all small size classes
are cached, and at a maximum all large size classes are cached. The
default maximum is 32 KiB (2^15).</para></listitem>
are cached; and at a maximum, size classes up to 8 MiB can be cached.
The default maximum is 32 KiB (2^15).</para></listitem>
</varlistentry>
<varlistentry id="opt.thp">

2
include/jemalloc/internal/tcache_structs.h
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@ -54,7 +54,7 @@ struct tcache_slow_s {
struct tcache_s {
tcache_slow_t *tcache_slow;
cache_bin_t bins[SC_NSIZES];
cache_bin_t bins[TCACHE_NBINS_MAX];
};
/* Linkage for list of available (previously used) explicit tcache IDs. */

5
include/jemalloc/internal/tcache_types.h
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@ -27,4 +27,9 @@ typedef struct tcaches_s tcaches_t;
/* Used for explicit tcache only. Means flushed but not destroyed. */
#define TCACHES_ELM_NEED_REINIT ((tcache_t *)(uintptr_t)1)
#define TCACHE_LG_MAXCLASS_LIMIT 23 /* tcache_maxclass = 8M */
#define TCACHE_MAXCLASS_LIMIT ((size_t)1 << TCACHE_LG_MAXCLASS_LIMIT)
#define TCACHE_NBINS_MAX (SC_NBINS + SC_NGROUP * \
(TCACHE_LG_MAXCLASS_LIMIT - SC_LG_LARGE_MINCLASS) + 1)
#endif /* JEMALLOC_INTERNAL_TCACHE_TYPES_H */

12
src/tcache.c
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@ -936,20 +936,20 @@ tcache_ncached_max_compute(szind_t szind) {
bool
tcache_boot(tsdn_t *tsdn, base_t *base) {
/* If necessary, clamp opt_lg_tcache_max. */
if (opt_lg_tcache_max < 0 || (ZU(1) << opt_lg_tcache_max) <
SC_SMALL_MAXCLASS) {
tcache_maxclass = opt_lg_tcache_max < 0 ? 0 :
ZU(1) << opt_lg_tcache_max;
if (tcache_maxclass < SC_SMALL_MAXCLASS) {
tcache_maxclass = SC_SMALL_MAXCLASS;
} else {
tcache_maxclass = (ZU(1) << opt_lg_tcache_max);
} else if (tcache_maxclass > TCACHE_MAXCLASS_LIMIT) {
tcache_maxclass = TCACHE_MAXCLASS_LIMIT;
}
nhbins = sz_size2index(tcache_maxclass) + 1;
if (malloc_mutex_init(&tcaches_mtx, "tcaches", WITNESS_RANK_TCACHES,
malloc_mutex_rank_exclusive)) {
return true;
}
nhbins = sz_size2index(tcache_maxclass) + 1;
/* Initialize tcache_bin_info. */
tcache_bin_info = (cache_bin_info_t *)base_alloc(tsdn, base,
nhbins * sizeof(cache_bin_info_t), CACHELINE);