Discussions > General Discussion

Turn on logging

bmillikan - June 11, 2009

I am running my embedded filesystem from a FLASH memory and I want to turn off all logging and other sources of periodic writes the OS does to disk/filesystem. Is this a simple way to turn this off? What are other sources of periodic writes to the filesystem other than logging?

Comments

Turn on logging

Submitted by Steve Chen on June 11, 2009 - 5:23pm.

Try disable CONFIG_PRINTK in kernel config. That should help reducing logging.

Turn on logging

Submitted by kaaching on June 11, 2009 - 6:42pm.

Just a few others tips: * don't run syslog or syslog-ng, * disable atime on the mount options of your file systems so the system doesn't try to write to the file system each time a file is accessed In general, I recommend people to run their rootfs from cramfs or squashfs and only mount a r/w file system on /var. That usually boosts boot speed, too :-)

Turn on logging

Submitted by tbird20d on June 12, 2009 - 8:38pm.

Just FYI - Disabling CONFIG_PRINTK in the kernel config will prevent the kernel from writing printk messages into the kernel log buffer. This buffer is a memory-based ring-buffer, which is not written to the file system by the kernel. That is done by a system logger from user-space. Obviously, if there are no messages in the log buffer, the log deamons have nothing to write, but it's kind of a blunt tool to use for this need.