On Mon, Jul 18, 2011 at 05:38:03PM -0400, Keiichi KII wrote: > From: Keiichi Kii <k-keiichi@xxxxxxxxxxxxx> > > This patch adds several tracepoints to track pagecach behavior. > These trecepoints would help us monitor pagecache usage with high resolution. > There are a few spelling mistakes there but what harm. This is an RFC. Again, it would be really nice if the changelog explained why it was useful to monitor pagecache usage at this resolution. For example, I could identify files with high and low hit ratios and conceivably identify system activity that resulted in page cache being trashed. However, even in that case, I don't necessarily care which files got chucked out and that sort of problem can also be seen via fault rates. Another scenario that may be useful is it could potentially identify an application bug that was invalidating a portion of a file that was in fact hot and in use by other processes. I'm sure you have much better examples that motivated the development of this series :) The tracepoints themselves look fine. -- Mel Gorman SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>