Mysql slow query log not working

Add this in my.cnf and then restart MySQL server:

general_log = 1
log=/var/log/mysql_slowquery.log

You can check whether the general_log is 'ON' or 'OFF' first using query:

mysql>show variables like '%log%';

You can enable it by below commoand without restart

SET GLOBAL slow_query_log = 'ON';