On Mon, Aug 23, 2010 at 6:20 PM, KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> wrote: >> On Fri, Aug 20, 2010 at 10:48 PM, Wu Fengguang <fengguang.wu@xxxxxxxxx> wrote: >> LOL. I know about these counters. This goes back and forth a lot. >> The reason we don't want to use this interface is several fold. > > Please don't use LOL if you want to get good discuttion. afaict, Wu have > deep knowledge in this area. However all kernel-developer don't know all > kernel knob. Apologies. No offense was intended. I was laughing at the situation and how I too once thought the per bdi counters were enough. Feng has been very helpful and patient. The discussion has done nothing but help the code so far so it is appreciated. > In nowadays, many distro mount debugfs at boot time. so, can you please > elaborate you worried risk? even though we have namespace. Right now we don't mount all of debugfs at boot time. We have not done the work to verify its safe in our environment. It's mostly a nit. Also I was under the impression that debugfs was intended more for kernel devs while /proc and /sys was intended for application developers. >> 3) Full system counters are easier to handle the juggling of removable >> storage where these numbers will appear and disappear due to being >> dynamic. This is the biggie to me. The idea is to get a complete view of the system's writeback behaviour over time. With systems with hot plug devices, or many many drives collecting that view gets difficult. >> The goal is to get a full view of the system writeback behaviour not a >> "kinda got it-oops maybe not" view. > > I bet nobody oppose this point :) Yup. mrubin -- 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
