journal: by default do not decompress dat objects larger than 64K

This introduces a new data threshold setting for sd_journal objects
which controls the maximum size of objects to decompress. This is
relieves the library from having to decompress full data objects even
if a client program is only interested in the initial part of them.

This speeds up "systemd-coredumpctl" drastically when invoked without
parameters.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c
index 3eaf0d3ee2..43ffe75560 100644
--- a/src/journal/journald-server.c
+++ b/src/journal/journald-server.c
@@ -934,6 +934,8 @@ int server_flush_to_var(Server *s) {
                 return r;
         }
 
+        sd_journal_set_data_threshold(j, 0);
+
         SD_JOURNAL_FOREACH(j) {
                 Object *o = NULL;
                 JournalFile *f;