High load when cups.path is enabled in RHEL 7

Issue

• With cups.path started, the "%system" CPU utilization is unacceptably high when many print jobs are submitted.
• We are seeing a performance issue with our primary point-of-sale Application. The only process with a high load is systemd. The performance issue causes users to be unable to print. Print jobs are hanging and the server needs to be restarted.
• The server runs fine for 2 weeks. Then CUPS starts giving problems, the server then needs to be rebooted. Linux services becomes so slow to a state they then hang. The first noticeable service is CUPS. The print becomes so slow to print.
• We are experiencing gradual increase of system utilization. The systems is acting as CUPS server. After 4 weeks the load on the average load on the system is above 10 and system become unresponsive.
• cupsd is utlilising +80-90% of one CPU. It is significantly slowing people from printing. Looking at the TOP command. The %CPU utilisation is 70% to CUPSD/SYSTEMD and each time one increase the other process follows.
• When the cups.path unit file is started, there is a performance impact that steadily grows over time. We noticed than when we run perf top, the _raw_spin_lock and __fsnotify_update_child_dentry_flags function calls to the kernel hitting about 50%, but that's just on starting it. Those function calls grow over time and negatively impact the entire system. When cups.path is restarted, the performance returns to normal but gradually worsens over time.