During my time with Yosemite, I've had an innocuous issue that gets logged to `system.log` non-stop.

This question is not about solving the issue.

I'd like to stop the chatter, because they're writes to the drive which is an SSD, and could do without them.

How can I silence or prevent the writes to the log?

The messages come from the kernel and blame `IO80211ScanManager`. Example:  

`Nov 19 02:04:46 Louis-MBP kernel[0]: IO80211ScanManager::startScan: pid 29 had pending scan request. Deleting.`

They dominate the log, whose 4000 most recent messages usually cover about a day.