15 Dec
2022
15 Dec
'22
8:06 p.m.
On Thu, Dec 15, 2022 at 09:02:08AM -0500, Dan Cross wrote:
On Thu, Dec 15, 2022 at 12:38 AM Bakul Shah
<bakul(a)iitbombay.org> wrote:
My mind went to similar thoughts. How did QNX manage the page cache?
Did they have mmap?
Don't see how unless they put multiple
related services in the same
address space, which reduces context switching but tends toward a
monokernel (& increased coupling). Unless I am misunderstanding you.
I don't see why two services in a microkernel couldn't arrange to
share a region of memory and implement bidirectional queues
between themselves. With an appropriate signalling mechanism,
you'd still be context switching but avoiding a lot of copying.