--- a/src/hotspot/share/classfile/compactHashtable.cpp	Wed Jan 10 22:48:27 2018 +0100
+++ b/src/hotspot/share/classfile/compactHashtable.cpp	Tue Feb 13 14:10:56 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -146,27 +146,23 @@
   cht->init(base_address,  _num_entries, _num_buckets,
             _compact_buckets->data(), _compact_entries->data());
 
-  if (log_is_enabled(Info, cds, hashtables)) {
-    ResourceMark rm;
-    LogMessage(cds, hashtables) msg;
-    stringStream info_stream;
-
+  LogMessage(cds, hashtables) msg;
+  if (msg.is_info()) {
     double avg_cost = 0.0;
     if (_num_entries > 0) {
       avg_cost = double(table_bytes)/double(_num_entries);
     }
-    info_stream.print_cr("Shared %s table stats -------- base: " PTR_FORMAT,
+    msg.info("Shared %s table stats -------- base: " PTR_FORMAT,
                          table_name, (intptr_t)base_address);
-    info_stream.print_cr("Number of entries       : %9d", _num_entries);
-    info_stream.print_cr("Total bytes used        : %9d", table_bytes);
-    info_stream.print_cr("Average bytes per entry : %9.3f", avg_cost);
-    info_stream.print_cr("Average bucket size     : %9.3f", summary.avg());
-    info_stream.print_cr("Variance of bucket size : %9.3f", summary.variance());
-    info_stream.print_cr("Std. dev. of bucket size: %9.3f", summary.sd());
-    info_stream.print_cr("Empty buckets           : %9d", _num_empty_buckets);
-    info_stream.print_cr("Value_Only buckets      : %9d", _num_value_only_buckets);
-    info_stream.print_cr("Other buckets           : %9d", _num_other_buckets);
-    msg.info("%s", info_stream.as_string());
+    msg.info("Number of entries       : %9d", _num_entries);
+    msg.info("Total bytes used        : %9d", table_bytes);
+    msg.info("Average bytes per entry : %9.3f", avg_cost);
+    msg.info("Average bucket size     : %9.3f", summary.avg());
+    msg.info("Variance of bucket size : %9.3f", summary.variance());
+    msg.info("Std. dev. of bucket size: %9.3f", summary.sd());
+    msg.info("Empty buckets           : %9d", _num_empty_buckets);
+    msg.info("Value_Only buckets      : %9d", _num_value_only_buckets);
+    msg.info("Other buckets           : %9d", _num_other_buckets);
   }
 }
 

--- a/src/hotspot/share/memory/filemap.cpp	Wed Jan 10 22:48:27 2018 +0100
+++ b/src/hotspot/share/memory/filemap.cpp	Tue Feb 13 14:10:56 2018 +0100
@@ -410,14 +410,11 @@
 // Write the FileMapInfo information to the file.
 
 void FileMapInfo::open_for_write() {
- _full_path = Arguments::GetSharedArchivePath();
-  if (log_is_enabled(Info, cds)) {
-    ResourceMark rm;
-    LogMessage(cds) msg;
-    stringStream info_stream;
-    info_stream.print_cr("Dumping shared data to file: ");
-    info_stream.print_cr("   %s", _full_path);
-    msg.info("%s", info_stream.as_string());
+  _full_path = Arguments::GetSharedArchivePath();
+  LogMessage(cds) msg;
+  if (msg.is_info()) {
+    msg.info("Dumping shared data to file: ");
+    msg.info("   %s", _full_path);
   }
 
 #ifdef _WINDOWS  // On Windows, need WRITE permission to remove the file.

--- a/src/hotspot/share/memory/metaspaceShared.cpp	Wed Jan 10 22:48:27 2018 +0100
+++ b/src/hotspot/share/memory/metaspaceShared.cpp	Tue Feb 13 14:10:56 2018 +0100
@@ -883,13 +883,11 @@
   const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
   const char *hdr = "                        ro_cnt   ro_bytes     % |   rw_cnt   rw_bytes     % |  all_cnt  all_bytes     %";
 
-  ResourceMark rm;
   LogMessage(cds) msg;
-  stringStream info_stream;
 
-  info_stream.print_cr("Detailed metadata info (excluding od/st regions; rw stats include md/mc regions):");
-  info_stream.print_cr("%s", hdr);
-  info_stream.print_cr("%s", sep);
+  msg.info("Detailed metadata info (excluding od/st regions; rw stats include md/mc regions):");
+  msg.info("%s", hdr);
+  msg.info("%s", sep);
   for (int type = 0; type < int(_number_of_types); type ++) {
     const char *name = type_name((Type)type);
     int ro_count = _counts[RO][type];
@@ -903,7 +901,7 @@
     double rw_perc = percent_of(rw_bytes, rw_all);
     double perc    = percent_of(bytes, ro_all + rw_all);
 
-    info_stream.print_cr(fmt_stats, name,
+    msg.info(fmt_stats, name,
                          ro_count, ro_bytes, ro_perc,
                          rw_count, rw_bytes, rw_perc,
                          count, bytes, perc);
@@ -921,8 +919,8 @@
   double all_rw_perc = percent_of(all_rw_bytes, rw_all);
   double all_perc    = percent_of(all_bytes, ro_all + rw_all);
 
-  info_stream.print_cr("%s", sep);
-  info_stream.print_cr(fmt_stats, "Total",
+  msg.info("%s", sep);
+  msg.info(fmt_stats, "Total",
                        all_ro_count, all_ro_bytes, all_ro_perc,
                        all_rw_count, all_rw_bytes, all_rw_perc,
                        all_count, all_bytes, all_perc);
@@ -930,7 +928,6 @@
   assert(all_ro_bytes == ro_all, "everything should have been counted");
   assert(all_rw_bytes == rw_all, "everything should have been counted");
 
-  msg.info("%s", info_stream.as_string());
 #undef fmt_stats
 }