Add "prof.dump_prefix" to override filename prefixes for dumps.

include/jemalloc/internal/ctl.h

@@ -103,6 +103,7 @@ bool ctl_boot(void);
 void ctl_prefork(tsdn_t *tsdn);
 void ctl_postfork_parent(tsdn_t *tsdn);
 void ctl_postfork_child(tsdn_t *tsdn);
+void ctl_mtx_assert_held(tsdn_t *tsdn);
 
 #define xmallctl(name, oldp, oldlenp, newp, newlen) do {		\
 	if (je_mallctl(name, oldp, oldlenp, newp, newlen)		\

include/jemalloc/internal/prof_externs.h

@@ -72,10 +72,12 @@ void prof_cnt_all(uint64_t *curobjs, uint64_t *curbytes, uint64_t *accumobjs,
     uint64_t *accumbytes);
 #endif
 int prof_getpid(void);
+void prof_get_default_filename(tsdn_t *tsdn, char *filename, uint64_t ind);
 bool prof_accum_init(tsdn_t *tsdn, prof_accum_t *prof_accum);
 void prof_idump(tsdn_t *tsdn);
 bool prof_mdump(tsd_t *tsd, const char *filename);
 void prof_gdump(tsdn_t *tsdn);
+bool prof_dump_prefix_set(tsdn_t *tsdn, const char *prefix);
 
 void prof_bt_hash(const void *key, size_t r_hash[2]);
 bool prof_bt_keycomp(const void *k1, const void *k2);

include/jemalloc/internal/prof_types.h

@@ -53,4 +53,11 @@ typedef struct prof_tdata_s prof_tdata_t;
 #define PROF_TDATA_STATE_PURGATORY	((prof_tdata_t *)(uintptr_t)2)
 #define PROF_TDATA_STATE_MAX		PROF_TDATA_STATE_PURGATORY
 
+/* Minimize memory bloat for non-prof builds. */
+#ifdef JEMALLOC_PROF
+#define PROF_DUMP_FILENAME_LEN (PATH_MAX + 1)
+#else
+#define PROF_DUMP_FILENAME_LEN 1
+#endif
+
 #endif /* JEMALLOC_INTERNAL_PROF_TYPES_H */