On Thu, Feb 6, 2020 at 2:24 PM Greg KH <greg@kroah.com> wrote:
On Thu, Feb 06, 2020 at 12:25:27PM -0500, William Tambe wrote:
Since voluntary preemption is used during kernel booting, is it safe to disable timer interrupt until (system_state >= SYSTEM_RUNNING) ?
Wouldn't it speed up booting ?
Try it and see!
:)
Seriously, think about what needs to be done by the system during boot time. Hardware is initialized, threads are spawned, lots of other things are going on. It's not just one single process until that system state change happens by any means.
I am doing kernel porting work and I am able to see Linux booting all the way to init without timer interrupt; despite kernel thread being spawned during booting. Perhaps I may start seeing issues if a module spawn a thread that never voluntarily preempt itself ?
thanks,
greg k-h