Re: user and kernel space ?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Kedar Sovani wrote:
> 
> Hi,
>       And also that unlike the processes can be pre- empted,while  the
> kernel cannnot. In that particular case you may have performance gains if
> you have something in the kernel, rather than being in the user space, as it
> runs continuously.

I don't think this is a good argument.

You must schedule() regularly in order for the machine to
be usable. Running in kernel space does not change that;
but it means you must call schedule() explicitly. The
only thing you save by running in kernel space is the
cost of the user<-->kernel transition, which I would
expect to be very small (though possibly significant in
some application, I suppose).

Cheers,

-- Joe
  "I'd rather chew my leg off than maintain Java code, which
   sucks, 'cause I have a lot of Java code to maintain and
   the leg surgery is starting to get expensive." - Me
--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/kernelnewbies/
FAQ:           http://kernelnewbies.org/faq/


[Index of Archives]     [Newbies FAQ]     [Linux Kernel Mentors]     [Linux Kernel Development]     [IETF Annouce]     [Git]     [Networking]     [Security]     [Bugtraq]     [Yosemite]     [MIPS Linux]     [ARM Linux]     [Linux RAID]     [Linux SCSI]     [Linux ACPI]
  Powered by Linux