journald: Increase stdout buffer size sooner, when almost full

If the previous received buffer length is almost equal to the allocated
buffer size, before this change the next read can only receive a couple
of bytes (in the worst case only 1 byte), which is not efficient.

diff --git a/src/journal/journald-stream.c b/src/journal/journald-stream.c
index 4dadbd62bec3201d9be4781470e893bf2c753393..6c10bfc259312712614f25da1c72fd8ebc2c8d14 100644 (file)
--- a/src/journal/journald-stream.c
+++ b/src/journal/journald-stream.c
@@ -511,8 +511,8 @@ static int stdout_stream_process(sd_event_source *es, int fd, uint32_t revents,
                 goto terminate;
         }
 
-        /* If the buffer is full already (discounting the extra NUL we need), add room for another 1K */
-        if (s->length + 1 >= s->allocated) {
+        /* If the buffer is almost full, add room for another 1K */
+        if (s->length + 512 >= s->allocated) {
                 if (!GREEDY_REALLOC(s->buffer, s->allocated, s->length + 1 + 1024)) {
                         log_oom();
                         goto terminate;