On Sun, 12 Sep 2010 22:58:13 -0700 Michael Rubin <mrubin@xxxxxxxxxx> wrote: > The kernel already exposes the user desired thresholds in /proc/sys/vm > with dirty_background_ratio and background_ratio. But the kernel may > alter the number requested without giving the user any indication that > is the case. > > Knowing the actual ratios the kernel is honoring can help app developers > understand how their buffered IO will be sent to the disk. > > $ grep threshold /proc/vmstat > nr_dirty_threshold 409111 > nr_dirty_background_threshold 818223 > Yes, I think /proc/vmstat is a decent place to put these. The needed infrastructural support is minimal and although these numbers are closely tied to the implementation-of-the-day, people should expect individual fields in /proc/vmstat to appear and disappear at random as kernel versions change. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>