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Tcache: Make flush fractions configurable.

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This commit is contained in:
David Goldblatt 2020-05-13 15:32:18 -07:00 committed by David Goldblatt
parent 7503b5b33a
commit 6cdac3c573
6 changed files with 29 additions and 2 deletions
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2
include/jemalloc/internal/tcache_externs.h
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@ -10,6 +10,8 @@ extern unsigned opt_tcache_nslots_large;
extern ssize_t opt_lg_tcache_shift;
extern size_t opt_tcache_gc_incr_bytes;
extern size_t opt_tcache_gc_delay_bytes;
extern unsigned opt_lg_tcache_flush_small_div;
extern unsigned opt_lg_tcache_flush_large_div;
/*
* Number of tcache bins. There are SC_NBINS small-object bins, plus 0 or more

4
include/jemalloc/internal/tcache_inlines.h
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@ -110,7 +110,7 @@ tcache_dalloc_small(tsd_t *tsd, tcache_t *tcache, void *ptr, szind_t binind,
cache_bin_t *bin = &tcache->bins[binind];
if (unlikely(!cache_bin_dalloc_easy(bin, ptr))) {
unsigned remain = cache_bin_info_ncached_max(
&tcache_bin_info[binind]) >> 1;
&tcache_bin_info[binind]) >> opt_lg_tcache_flush_small_div;
tcache_bin_flush_small(tsd, tcache, bin, binind, remain);
bool ret = cache_bin_dalloc_easy(bin, ptr);
assert(ret);
@ -128,7 +128,7 @@ tcache_dalloc_large(tsd_t *tsd, tcache_t *tcache, void *ptr, szind_t binind,
cache_bin_t *bin = &tcache->bins[binind];
if (unlikely(!cache_bin_dalloc_easy(bin, ptr))) {
unsigned remain = cache_bin_info_ncached_max(
&tcache_bin_info[binind]) >> 1;
&tcache_bin_info[binind]) >> opt_lg_tcache_flush_large_div;
tcache_bin_flush_large(tsd, tcache, bin, binind, remain);
bool ret = cache_bin_dalloc_easy(bin, ptr);
assert(ret);

10
src/ctl.c
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@ -110,6 +110,8 @@ CTL_PROTO(opt_tcache_nslots_large)
CTL_PROTO(opt_lg_tcache_nslots_mul)
CTL_PROTO(opt_tcache_gc_incr_bytes)
CTL_PROTO(opt_tcache_gc_delay_bytes)
CTL_PROTO(opt_lg_tcache_flush_small_div)
CTL_PROTO(opt_lg_tcache_flush_large_div)
CTL_PROTO(opt_thp)
CTL_PROTO(opt_lg_extent_max_active_fit)
CTL_PROTO(opt_prof)
@ -355,6 +357,10 @@ static const ctl_named_node_t opt_node[] = {
{NAME("lg_tcache_nslots_mul"), CTL(opt_lg_tcache_nslots_mul)},
{NAME("tcache_gc_incr_bytes"), CTL(opt_tcache_gc_incr_bytes)},
{NAME("tcache_gc_delay_bytes"), CTL(opt_tcache_gc_delay_bytes)},
{NAME("lg_tcache_flush_small_div"),
CTL(opt_lg_tcache_flush_small_div)},
{NAME("lg_tcache_flush_large_div"),
CTL(opt_lg_tcache_flush_large_div)},
{NAME("thp"), CTL(opt_thp)},
{NAME("lg_extent_max_active_fit"), CTL(opt_lg_extent_max_active_fit)},
{NAME("prof"), CTL(opt_prof)},
@ -1816,6 +1822,10 @@ CTL_RO_NL_GEN(opt_tcache_nslots_large, opt_tcache_nslots_large, unsigned)
CTL_RO_NL_GEN(opt_lg_tcache_nslots_mul, opt_lg_tcache_nslots_mul, ssize_t)
CTL_RO_NL_GEN(opt_tcache_gc_incr_bytes, opt_tcache_gc_incr_bytes, size_t)
CTL_RO_NL_GEN(opt_tcache_gc_delay_bytes, opt_tcache_gc_delay_bytes, size_t)
CTL_RO_NL_GEN(opt_lg_tcache_flush_small_div, opt_lg_tcache_flush_small_div,
unsigned)
CTL_RO_NL_GEN(opt_lg_tcache_flush_large_div, opt_lg_tcache_flush_large_div,
unsigned)
CTL_RO_NL_GEN(opt_thp, thp_mode_names[opt_thp], const char *)
CTL_RO_NL_GEN(opt_lg_extent_max_active_fit, opt_lg_extent_max_active_fit,
size_t)

6
src/jemalloc.c
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@ -1397,6 +1397,12 @@ malloc_conf_init_helper(sc_data_t *sc_data, unsigned bin_shard_sizes[SC_NBINS],
"tcache_gc_delay_bytes", 0, SIZE_T_MAX,
CONF_DONT_CHECK_MIN, CONF_DONT_CHECK_MAX,
/* clip */ false)
CONF_HANDLE_UNSIGNED(opt_lg_tcache_flush_small_div,
"lg_tcache_flush_small_div", 1, 16,
CONF_CHECK_MIN, CONF_CHECK_MAX, /* clip */ true)
CONF_HANDLE_UNSIGNED(opt_lg_tcache_flush_large_div,
"lg_tcache_flush_large_div", 1, 16,
CONF_CHECK_MIN, CONF_CHECK_MAX, /* clip */ true)
/*
* The runtime option of oversize_threshold remains

2
src/stats.c
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@ -1113,6 +1113,8 @@ stats_general_print(emitter_t *emitter) {
OPT_WRITE_SSIZE_T("lg_tcache_nslots_mul")
OPT_WRITE_SIZE_T("tcache_gc_incr_bytes")
OPT_WRITE_SIZE_T("tcache_gc_delay_bytes")
OPT_WRITE_UNSIGNED("lg_tcache_flush_small_div")
OPT_WRITE_UNSIGNED("lg_tcache_flush_large_div")
OPT_WRITE_CHAR_P("thp")
OPT_WRITE_BOOL("prof")
OPT_WRITE_CHAR_P("prof_prefix")

7
src/tcache.c
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@ -53,6 +53,13 @@ size_t opt_tcache_gc_incr_bytes = 65536;
*/
size_t opt_tcache_gc_delay_bytes = 0;
/*
* When a cache bin is flushed because it's full, how much of it do we flush?
* By default, we flush half the maximum number of items.
*/
unsigned opt_lg_tcache_flush_small_div = 1;
unsigned opt_lg_tcache_flush_large_div = 1;
cache_bin_info_t *tcache_bin_info;
/* Total stack size required (per tcache). Include the padding above. */