Re: Hacking gnumach to track parental relationship of tasks

[Samuel Thibault]

Ludovic Courtès, le Wed 11 Sep 2013 19:59:24 +0200, a écrit :
> In the case we discuss here, the semantics of ‘task_create’ would be
> preserved.
> 
> There’s surely a performance impact, that would have to be measured.
> Now, how bad is it compared to, say, calling user-space ethernet drivers
> vs. in-kernel drivers?  :-)

Possibly big: if we are to interpose *all* kernel traps, that means
interposing vm_allocate/deallocate and such, and IPC might suffer quite
a bit. Userland network drivers only have impact on network bandwidth,
not on *all* operations.

Samuel