Hello. I understand this question is asked again and again... But I'm a newbie :) But I want to tell I want to do: I need info about traffic of every user on my linux box. I looked through list of available software but ... :( So I decided to make if myself. Main idea was quite simple: When socket is created we can know uid of user who is trying to create socket. So I have to add rx and tx counters to data structures and simply count all incoming/outgoing data and when socket is closing just to dump this info, for example to syslog. It works fine but my syslog grows up to some G... :( So I have to find a way to dump info which uses less disk space. I think the best way is to dump directly to logfile and dump binary data, for example some struct. So I needed a way to write to a file from inside kernel. I wanted it configurable but I understand that it's not good to parse config inside kernel. So I use /proc: Userspace program opens file for writing, gives FD to kernel through /proc and sleeps for a time. Inside kernel I use FD to locate "struct file" from "current" pointer and save it for feature use. So now I have a way to write to file: file->f_op->write(..) or generic_file_write(..). I use it when socket is closed. It works.. for me without any oops. But I wanted to improve this: If my linux box crashs I lost some info from sockets what was alive for a long period of time... Or I lost info from sockets in listening state. So I wanted to do a periodical dump of info to my logfile. So I used timer to do it. But timer_func is executed in another context or something else ... so now I have a panic(). As I can see from oops it complains about schedule in interrupt. So my questions are: Is my way of dumping correct? If yes where i can find a bug or ... If no where I can read about better way? Or tell me here... Thanks! :) -- Burchu Sergey. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
