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Add the S/s JEMALLOC_OPTIONS flags to enable/disable tcache bin sorting.

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This commit is contained in:
Jason Evans 2010-01-03 16:17:52 -08:00
parent 279e09d1ff
commit e9db6c92ab
2 changed files with 22 additions and 1 deletions
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9
jemalloc/doc/jemalloc.3.in
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@ -312,6 +312,15 @@ Double/halve the size of the maximum size class that is a multiple of the
quantum (8 or 16 bytes, depending on architecture). quantum (8 or 16 bytes, depending on architecture).
Above this size, cacheline spacing is used for size classes. Above this size, cacheline spacing is used for size classes.
The default value is 128 bytes. The default value is 128 bytes.
@roff_tcache@.It S
@roff_tcache@Sort the objects of a particular size class that are stored in a
@roff_tcache@thread-specific cache just before flushing some of them from the
@roff_tcache@cache, such that the objects highest in memory are preferentially
@roff_tcache@freed.
@roff_tcache@This tends to reduce fragmentation, but sorting is (n lg n), and in
@roff_tcache@practice it is expensive enough to have a moderate performance
@roff_tcache@impact.
@roff_tcache@This option is enabled by default.
@roff_trace@.It T @roff_trace@.It T
@roff_trace@Write a verbose trace log to a set of files named according to the @roff_trace@Write a verbose trace log to a set of files named according to the
@roff_trace@pattern @roff_trace@pattern

14
jemalloc/src/jemalloc.c
View File

@ -1090,6 +1090,7 @@ static bool opt_junk = false;
#ifdef JEMALLOC_TCACHE #ifdef JEMALLOC_TCACHE
static size_t opt_lg_tcache_nslots = LG_TCACHE_NSLOTS_DEFAULT; static size_t opt_lg_tcache_nslots = LG_TCACHE_NSLOTS_DEFAULT;
static ssize_t opt_lg_tcache_gc_sweep = LG_TCACHE_GC_SWEEP_DEFAULT; static ssize_t opt_lg_tcache_gc_sweep = LG_TCACHE_GC_SWEEP_DEFAULT;
static bool opt_tcache_sort = true;
#endif #endif
static ssize_t opt_lg_dirty_mult = LG_DIRTY_MULT_DEFAULT; static ssize_t opt_lg_dirty_mult = LG_DIRTY_MULT_DEFAULT;
static bool opt_stats_print = false; static bool opt_stats_print = false;
@ -4058,7 +4059,7 @@ tcache_bin_flush(tcache_bin_t *tbin, size_t binind, unsigned rem)
void *ptr; void *ptr;
unsigned i, ndeferred, ncached; unsigned i, ndeferred, ncached;
if (rem > 0) { if (opt_tcache_sort && rem > 0) {
assert(rem < tbin->ncached); assert(rem < tbin->ncached);
/* Sort pointers such that the highest objects will be freed. */ /* Sort pointers such that the highest objects will be freed. */
tcache_bin_sort(tbin); tcache_bin_sort(tbin);
@ -5696,6 +5697,14 @@ MALLOC_OUT:
opt_lg_cspace_max) opt_lg_cspace_max)
opt_lg_qspace_max++; opt_lg_qspace_max++;
break; break;
#ifdef JEMALLOC_TCACHE
case 's':
opt_tcache_sort = false;
break;
case 'S':
opt_tcache_sort = true;
break;
#endif
#ifdef JEMALLOC_TRACE #ifdef JEMALLOC_TRACE
case 't': case 't':
opt_trace = false; opt_trace = false;
@ -6418,6 +6427,9 @@ malloc_stats_print(const char *opts)
malloc_message(opt_junk ? "J" : "j", "", "", ""); malloc_message(opt_junk ? "J" : "j", "", "", "");
#endif #endif
malloc_message("P", "", "", ""); malloc_message("P", "", "", "");
#ifdef JEMALLOC_TCACHE
malloc_message(opt_tcache_sort ? "S" : "s", "", "", "");
#endif
#ifdef JEMALLOC_TRACE #ifdef JEMALLOC_TRACE
malloc_message(opt_trace ? "T" : "t", "", "", ""); malloc_message(opt_trace ? "T" : "t", "", "", "");
#endif #endif