2010/6/9 wu zhangjin <wuzhangjin@xxxxxxxxx>: > Hi, > > On Wed, Jun 9, 2010 at 4:14 PM, Ryan Wang <openspace.wang@xxxxxxxxx> wrote: > [...] >>>> >>>> -- >>>> To unsubscribe from this list: send an email with >>>> "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx >>>> Please read the FAQ at http://kernelnewbies.org/FAQ >>>> >>> >>> >> >> Seems ftrace is helpful to study the activities inside the kernel to me. >> I wonder whether it can be useful to debug kernel bugs. And if so, will >> you please give me some examples? > > Yeah, did you read this paper written by Steven: "Finding Origins of > Latencies Using Ftrace" (please google to download it). > If not, please read it. that paper will tell you what Ftrace really is > and will show the demos how to play with it. > >> Or so far it's mainly used for >> observing the running status of kernel? > > Ftrace is originally created for debugging and optimizing the > preempt-rt, but of course, it becomes a tracing framework currently. > > It not only show you what the kernel space does when you do something > in user space, > but will show you the calling tree of kernel functions, time consuming > of every function and > even allow you to filter the parts you care about. > > If you need more info about it, please refer to: > > [1] Debugging the kernel using Ftrace > http://lwn.net/Articles/365835/ > http://lwn.net/Articles/366796/ > [2] Ftrace usage .... > Documentation/trace/ftrace.txt > Documentation/trace/ftrace-desgin.txt > [3] Tools for Ftrace > trace-cmd from readhat... > > Regards, > > -- > Studying engineer. Wu Zhangjin > Lanzhou University http://www.lzu.edu.cn > Distributed & Embedded System Lab http://dslab.lzu.edu.cn > School of Information Science and Engeneering http://xxxy.lzu.edu.cn > wuzhangjin@xxxxxxxxx http://falcon.oss.lzu.edu.cn > Address:Tianshui South Road 222,Lanzhou,P.R.China Zip Code:730000 > Tel:+86-931-8912025 > Thanks all! -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
