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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).
Above this size, cacheline spacing is used for size classes.
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@Write a verbose trace log to a set of files named according to the
@roff_trace@pattern

14
jemalloc/src/jemalloc.c
View File

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