Making jemalloc max stack depth a runtime option

include/jemalloc/internal/prof_externs.h

@@ -7,6 +7,7 @@
 extern bool opt_prof;
 extern bool opt_prof_active;
 extern bool opt_prof_thread_active_init;
+extern unsigned opt_prof_bt_max;
 extern size_t opt_lg_prof_sample;    /* Mean bytes between samples. */
 extern ssize_t opt_lg_prof_interval; /* lg(prof_interval). */
 extern bool opt_prof_gdump;          /* High-water memory dumping. */

include/jemalloc/internal/prof_structs.h

@@ -202,7 +202,7 @@ struct prof_tdata_s {
 	prof_cnt_t		cnt_summed;
 
 	/* Backtrace vector, used for calls to prof_backtrace(). */
-	void			*vec[PROF_BT_MAX];
+	void 			**vec;
 };
 typedef rb_tree(prof_tdata_t) prof_tdata_tree_t;
 

include/jemalloc/internal/prof_types.h

@@ -23,7 +23,12 @@ typedef struct prof_recent_s prof_recent_t;
  * is based on __builtin_return_address() necessarily has a hard-coded number
  * of backtrace frame handlers, and should be kept in sync with this setting.
  */
-#define PROF_BT_MAX			128
+#ifdef JEMALLOC_PROF_GCC
+#  define PROF_BT_MAX_LIMIT 256
+#else
+#  define PROF_BT_MAX_LIMIT UINT_MAX
+#endif
+#define PROF_BT_MAX_DEFAULT			128
 
 /* Initial hash table size. */
 #define PROF_CKH_MINITEMS		64