Hi, Tim, Reading your reply helped a great deal.
I am conducting research work of network analysis on smartphone. I am trying to measuring the RTT and monitor other TCP behavior. I have tried to implement such functions using libpcap/TCPdump, but it seems too heavy (hurt battery). So I am thinking if I can get some support from kernel side to mitigate the performance overhead, since TCP stack keeps track of such information. Any comments or suggestions on this? Regards! Yu On Mar 24, 2:49 pm, Tim Bird <[email protected]> wrote: > On 03/24/2011 10:45 AM, Yu wrote: > > > Hi, All, > > > I would like to expose some monitoring metrics from kernel and store > > them in a circular table for debugging. > > > In traditional linux, this might be possible through kvm. > > > But is it possible for me to read this kernel data structure in > > android? > > The traditional way to doing this is to expose kernel data > through either the /proc fs or debugfs. An android program > can then read the data through normal read/write operations > on the filesystem. Even if you're doing something binary > and complex, you could expose it through ioctls, or your > own char driver, and, again, read these from Java. > > What data are you trying to get? There's a lot of data > already published through /proc that's available. > Also, with more recent kernel versions (2.6.35 and above) > you can turn on trace instrumentation and retrieve > system information with ftrace. > -- Tim > > ============================= > Tim Bird > Architecture Group Chair, CE Linux Forum > Senior Staff Engineer, Sony Network Entertainment > ============================= -- unsubscribe: [email protected] website: http://groups.google.com/group/android-kernel
