differences between kernel and user mode?

[Jincuteguy]

Let say I have a function write_block(...) which must be run in supervisor (kernel) mode. What type of differences will I see when a user process versus a supervisor process needs to invoke write_block? Consider both how a programmer might invoke write_block and any differences in performance.

 

[Jincuteguy]

anyone?

 

[drag]

Hell if I know. The only thing I understand is that stuff that runs in the kernel memory space is from the kernel and thus is kernel mode. And everything else is usermode.

...

That's about it for me. I don't know if this is the correct sort of forums to be asking questions like this. This is more a forum end-user and most people here don't do much in the way of developement or programming. And people here who would know about this probably wouldn't talk about it a whole lot here.

Maybe you should look thru some archived mailing lists thru google and stuff. Your probably not the first person to ask question like that and you can probably find answers somewhere.. or maybe just subscribe to some kernel developement mailing lists and you can get the kernel hackers to answer your questions directly.

Of course this is only relavent if your interested in how a BSD kernel or a Linux kernel works....

 

[Jincuteguy]

yea how about tell me about the Linux kernel works according to my question. thx.