Faster streaming by 25% on the child (#13708)

* faster printing of BEGIN, SET, END

* fewer conditions

* faster buffer_fast_strcat()

* faster buffer_fast_strcat() fix

* eliminate atomic operations and conditions in the BEGIN, SET, END flow

* removed unecessary condition

2 files changed, 13 insertions, 0 deletions

diff --git a/libnetdata/buffer/buffer.c b/libnetdata/buffer/buffer.c
index 8a32184f60..3d29c30255 100644
--- a/libnetdata/buffer/buffer.c
+++ b/libnetdata/buffer/buffer.c
@@ -136,6 +136,18 @@ void buffer_print_llu(BUFFER *wb, unsigned long long uvalue)
     wb->len += wstr - str;
 }
 
+void buffer_print_ll(BUFFER *wb, long long value)
+{
+    buffer_need_bytes(wb, 50);
+
+    if(value < 0) {
+        buffer_fast_strcat(wb, "-", 1);
+        value = -value;
+    }
+
+    buffer_print_llu(wb, value);
+}
+
 void buffer_fast_strcat(BUFFER *wb, const char *txt, size_t len) {
     if(unlikely(!txt || !*txt)) return;
 
diff --git a/libnetdata/buffer/buffer.h b/libnetdata/buffer/buffer.h
index 42425b4cb7..c134cc9aca 100644
--- a/libnetdata/buffer/buffer.h
+++ b/libnetdata/buffer/buffer.h
@@ -78,6 +78,7 @@ extern char *print_number_llu_r(char *str, unsigned long long uvalue);
 extern char *print_number_llu_r_smart(char *str, unsigned long long uvalue);
 
 extern void buffer_print_llu(BUFFER *wb, unsigned long long uvalue);
+extern void buffer_print_ll(BUFFER *wb, long long value);
 
 static inline void buffer_need_bytes(BUFFER *buffer, size_t needed_free_size) {
     if(unlikely(buffer->size - buffer->len < needed_free_size))