Error when mporting a large question file (around 360MB):

Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 67108872 bytes) in /var/www/html/question/format.php on line 615
Call Stack

1. Time Memory Function Location
   1 0.0093 404520 {main}( ) .../import.php:0
   2 1.0923 9727608 qformat_xml->importprocess( ) .../import.php:123
   3 5.4069 9711472 qformat_xml->readdata( ??? ) .../format.php:312
   4 7.0664 9711472 file ( ??? ) .../format.php:615

The issue seem to be fixed for smaller question file:

https://tracker.moodle.org/browse/MDL-50806

It wonder if the memory_limit can be raised based on the file size (or configurable) for question import.