# HG changeset patch
# User jiefu
# Date 1568451220 -28800
#      Sat Sep 14 16:53:40 2019 +0800
# Node ID de54e06277a82f6d619a5c50dde1aeb48140bab6
# Parent  3054503bad7d84214fc735acc651eb1c3c77f037
8231024: Improve the debug info when the output is truncated
Reviewed-by:

diff --git a/src/hotspot/share/utilities/ostream.cpp b/src/hotspot/share/utilities/ostream.cpp
--- a/src/hotspot/share/utilities/ostream.cpp
+++ b/src/hotspot/share/utilities/ostream.cpp
@@ -105,7 +105,7 @@
     if ((size_t)written < buflen) {
       result_len = written;
     } else {
-      DEBUG_ONLY(warning("increase O_BUFLEN in ostream.hpp -- output truncated");)
+      DEBUG_ONLY(warning("increase O_BUFLEN in ostream.hpp: at least %d is required -- output truncated", written + 1);)
       result_len = buflen - 1;
     }
   }