On 01/12/2011 06:09 PM, Theodore Tso wrote: > > On Jan 12, 2011, at 4:35 PM, Luis R. Rodriguez wrote: > >> When I yank my power chord off of my Thinkpad T61 running 2.6.37 I get >> the following: >> >> [ 79.523778] Monitor-Mwait will be used to enter C-3 state >> [ 81.195402] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro,commit=600 >> >> mcgrof@tux ~ $ mount| grep sda1 >> /dev/sda1 on / type ext4 (rw,errors=remount-ro,commit=600) > > Sounds like you have some userspace script which is being triggered on the transition running on batteries, and it's doing a remount -o commit=600 to save power. Are you using laptop_mode by any chance? > That is interesting indeed. While I am running a substantially older kernel ( 2.6.35-24-generic #42-Ubuntu 10.10 ). I was seeing a consistent problem where if you pulled the power cord while the system was under heavy I/O load, you could no longer run sync. The jbd2 process just kept on running forever continuously. Shutdown was impossible to because vfs unmount blocked (hold power key for 4+ seconds...). The script in question is: /usr/lib/pm-utils/power.d/journal-commit I commented out the line: # mount -o remount,$2 $1 And now gone is the nasty problem of not being able to shutdown or have processes block on a call to sync(). Clearly this is nothing more than a band aid, and perhaps it is fixed in a newer kernel (one can hope anyway). Cheers, Jason. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
