From c0a9db6d0fc92c50bc02d07bcb21c9e5869755ae Mon Sep 17 00:00:00 2001
From: Martin Piatka <piatka@cesnet.cz>
Date: Tue, 2 Aug 2022 12:30:18 +0200
Subject: [PATCH] logging: reserve space in buffer

---
 src/debug.cpp | 6 +++++-
 src/debug.h   | 3 ++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/debug.cpp b/src/debug.cpp
index 258f824fc..31a2cb6f6 100644
--- a/src/debug.cpp
+++ b/src/debug.cpp
@@ -378,4 +378,8 @@ void debug_file_dump(const char *key, void (*serialize)(const void *data, FILE *
 
 thread_local std::set<uint32_t> Logger::oneshot_messages;
 
-thread_local std::string Log_output::buffer;
+thread_local std::string Log_output::buffer(initial_buf_size, '\0');
+
+Log_output::Log_output(){
+        last_msg.reserve(initial_buf_size);
+}
diff --git a/src/debug.h b/src/debug.h
index 98d0322ad..9a9d62d11 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -145,7 +145,7 @@ class Log_output{
                 Log_output& lo;
         };
 public:
-        Log_output() = default;
+        Log_output();
         
         Buffer get_buffer() { return Buffer(*this); }
 
@@ -164,6 +164,7 @@ public:
 private:
         void submit();
 
+        constexpr static int initial_buf_size = 256;
         thread_local static std::string buffer;
 
         std::atomic<bool> skip_repeated;