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/journal-internal.h b/src/journal/journal-internal.h
index 75a4129e5b..97de0e75ff 100644
--- a/src/journal/journal-internal.h
+++ b/src/journal/journal-internal.h
@@ -121,6 +121,8 @@ struct sd_journal {
         uint64_t unique_offset;
 
         bool on_network;
+
+        size_t data_threshold;
 };
 
 char *journal_make_match_string(sd_journal *j);