madvise(..., MADV_{RANODOM,NOSYNC}) swap files.

Initialize malloc before calling into the ctl_*() functions.

jemalloc/src/jemalloc.c

@@ -1246,6 +1246,9 @@ JEMALLOC_P(mallctl)(const char *name, void *oldp, size_t *oldlenp, void *newp,
     size_t newlen)
 {
 
+	if (malloc_init())
+		return (EAGAIN);
+
 	return (ctl_byname(name, oldp, oldlenp, newp, newlen));
 }
 
@@ -1254,6 +1257,9 @@ int
 JEMALLOC_P(mallctlnametomib)(const char *name, size_t *mibp, size_t *miblenp)
 {
 
+	if (malloc_init())
+		return (EAGAIN);
+
 	return (ctl_nametomib(name, mibp, miblenp));
 }
 
@@ -1263,6 +1269,9 @@ JEMALLOC_P(mallctlbymib)(const size_t *mib, size_t miblen, void *oldp,
     size_t *oldlenp, void *newp, size_t newlen)
 {
 
+	if (malloc_init())
+		return (EAGAIN);
+
 	return (ctl_bymib(mib, miblen, oldp, oldlenp, newp, newlen));
 }
 

jemalloc/src/jemalloc_chunk_swap.c

@@ -311,6 +311,19 @@ chunk_swap_enable(const int *fds, unsigned nfds, bool prezeroed)
 			goto RETURN;
 		}
 		assert(addr == (void *)((uintptr_t)vaddr + voff));
+
+		/*
+		 * Tell the kernel that the mapping will be accessed randomly,
+		 * and that it should not gratuitously sync pages to the
+		 * filesystem.
+		 */
+#ifdef MADV_RANDOM
+		madvise(addr, sizes[i], MADV_RANDOM);
+#endif
+#ifdef MADV_NOSYNC
+		madvise(addr, sizes[i], MADV_NOSYNC);
+#endif
+
 		voff += sizes[i];
 	}