Hi David, On Fri 29/02/08 4:17 PM , "David Embid" davidembid@xxxxxxxxx sent: > Actually the monitoring is only a first step. With the monitored data > the module tries to manage the resources. The task monitored have a > budget linked so when they run more time than their budget a handling > function is called. Just a curious question. Why are you doing this in a kernel module ? You could very well implement cpu/memory limits using tools such as 'ulimit', 'pam_limits', 'nice', 'chrt', 'taskset' ...etc. Ofcouse, none of these do any monitoring, but if you are monitoring just for the sake of implementing limits, I would think doing that in the kernel would be way more complicated than using any one or a combination of the tools mentioned above. regards, - steve > So I need the function on the module to be > accessed form the kernel linux in some way. I forget specifying I > am working with Kernel 2.6 Thanks for answering, Regards > > 2008/2/29, Steve : Hi David, > > On Fri 29/02/08 12:59 PM , "David Embid" davidembid@xxxxxxxxx [2] > sent: > > Hi, > > > > i have been developing a little module to monitoring the use of CPU > > for some processes. For this, I need to handle the moment when the > > scheduler switch the processes. My problem is that I don't know > > how can I access the handling function (contained on my kernel > > module) from the kernel scheduler (sched.c). I have tried with a > > function callback. My module overwrite a function pointer used by > the > > kernel to acces the handler when the module is loaded. This > solution > > seems to work properly and the function is called every switch made > > by the scheduler. The problem is that the variables used on the > > function have different memory direction when the function is > called > > by the callback on the kernel and the direction when the variable > is > > used on other function in the module. > > Can someone give me some advice? > Well, I am a kernel n00b myself, but if you are interested in just > monitoring and are not really doing this as an exercise to learn > kernel programming, I think susing systemtap would be ideal for > something like this. > http://sourceware.org/systemtap/ [3] > http://sourceware.org/systemtap/documentation.html [4] > > Could someone here possibly post a stap script to do what David needs > ? > regards, > - steve > > > Links: > ------ > [1] > http://webmail.lonetwin.net/javascript:top.opencompose(\'steve@xxxxxxxxxxxx > \',\'\',\'\',\'\')[2] > http://webmail.lonetwin.net/javascript:top.opencompose(\'davidembid@xxxxxxx > om\',\'\',\'\',\'\')[3] http://sourceware.org/systemtap/ > [4] http://sourceware.org/systemtap/documentation.html > > -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
