The stream event source has a priority of SD_EVENT_PRIORITY_NORMAL+5,
and stdout source +10, but the native and syslog event sources are left
at the default of 0.
As a result, any heavy native or syslog logger can cause starvation of
the other loggers. This is trivially demonstrated by running:
dd if=/dev/urandom bs=8k | od | systemd-cat & # native spammer
systemd-run echo hello & # stream logger
journalctl --follow --output=verbose --no-pager --identifier=echo &
... and wait, and wait, the "hello" never comes.
Now kill %1, "hello" arrives finally.
if (r < 0)
return log_error_errno(r, "Failed to add native server fd to event loop: %m");
+ r = sd_event_source_set_priority(s->native_event_source, SD_EVENT_PRIORITY_NORMAL+5);
+ if (r < 0)
+ return log_error_errno(r, "Failed to adjust native event source priority: %m");
+
return 0;
}
if (r < 0)
return log_error_errno(r, "Failed to add stdout server fd to event source: %m");
- r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+10);
+ r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+5);
if (r < 0)
return log_error_errno(r, "Failed to adjust priority of stdout server event source: %m");
if (r < 0)
return log_error_errno(r, "Failed to add syslog server fd to event loop: %m");
+ r = sd_event_source_set_priority(s->syslog_event_source, SD_EVENT_PRIORITY_NORMAL+5);
+ if (r < 0)
+ return log_error_errno(r, "Failed to adjust syslog event source priority: %m");
+
return 0;
}