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-rw-r--r--open_issues/implementing_hurd_on_top_of_another_system.mdwn37
1 files changed, 37 insertions, 0 deletions
diff --git a/open_issues/implementing_hurd_on_top_of_another_system.mdwn b/open_issues/implementing_hurd_on_top_of_another_system.mdwn
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--- a/open_issues/implementing_hurd_on_top_of_another_system.mdwn
+++ b/open_issues/implementing_hurd_on_top_of_another_system.mdwn
@@ -78,3 +78,40 @@ IRC, #hurd, 2010-12-28
<antrik> though I must say that I'm more and more convinced running the
Hurd on top of a monolithic kernel would actually be a useful approach
for the time being...
+
+---
+
+IRC, #hurd, 2011-02-11
+
+ <neal> marcus and I were discussing how to add Mach to Linux
+ <neal> one could write a module to implement Mach IPC
+ <neal> and another to implement Mach VM
+ <neal> the big thing missing with Mach VM is the ability for a tracing
+ process to easily map or unmap an inferior process's memory
+ <antrik> neal: why would a tracing process need to map the inferior's
+ memory?
+ <neal> the simple answer is that is how it is done on Mach
+ <antrik> neal: is it? not sure we are talking about the same thing
+ here. GDB uses vm_read()/vm_write() to access the inferior's memory AFAIK
+ <neal> on linux?
+ <neal> I think it use /proc/pid/mem
+ <antrik> on Hurd
+ <neal> I'm talking about adding Mach to Linux
+ <neal> by adding some functionality to Linux
+ <neal> and then implementing a bunch in user space
+ <antrik> yeah, but I don't understand the point about mapping inferior's
+ memory :-(
+ <antrik> what would be in user space?
+ <neal> there are a number of different cut points
+ <neal> one could imagine just using Linux's device drivers, CPU scheduler,
+ memory management, etc.
+ <neal> another possibility would be something higher where Hurd processes
+ just use some Hurdish servers
+ <antrik> neal: yeah, these are all options I have been considering... too
+ bad I wasn't able to come to FOSDEM -- I'd love to have participated in
+ this discussion :-(
+ <antrik> neal: BTW, were you just discussing this as a hypothetical idea,
+ or something you are seriously considering?
+ <neal> I'm unlikely to work on it, sorry
+ <antrik> didn't really expect that :-)
+ <antrik> would be nice though if you could write up your conclusions...