journal: bump RLIMIT_NOFILE when journal files to 16K (if possible)

When there are a lot of split out journal files, we might run out of fds
quicker then we want. Hence: bump RLIMIT_NOFILE to 16K if possible.

Do these even for journalctl. On Fedora the soft RLIMIT_NOFILE is at 1K,
the hard at 4K by default for normal user processes, this code hence
bumps this up for users to 4K.

https://bugzilla.redhat.com/show_bug.cgi?id=1179980

1 files changed, 5 insertions, 0 deletions

diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index 62931f14c9..db9576c493 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -1722,6 +1722,11 @@ int main(int argc, char *argv[]) {
         signal(SIGWINCH, columns_lines_cache_reset);
         sigbus_install();
 
+        /* Increase max number of open files to 16K if we can, we
+         * might needs this when browsing journal files, which might
+         * be split up into many files. */
+        setrlimit_closest(RLIMIT_NOFILE, &RLIMIT_MAKE_CONST(16384));
+
         if (arg_action == ACTION_NEW_ID128) {
                 r = generate_new_id128();
                 goto finish;