logs to /tmp/ - does this write Linino flash?

By editing the run-bridge file (fix with -u) I saw the log of this goes to the /tmp/ folder.

Does this actually write on the Yun flash? If so, wouldn't it be better to redirect this to to SD card?

Openwrt uses ram for /tmp. To demonstrate, put something in there and reboot and it is gone.

Confirm. No flash usage when writing on /tmp