Hi - On Tue, Dec 01, 2009 at 05:11:32PM +0100, Ingo Molnar wrote: > Those facilities are not overlapping with kgdb though so my point doesnt > apply to them. An in-kernel gdb server sure overlaps/extends kgdb > though.
Only in name. One is highly invasive, for debugging the kernel across serial consoles. The other is highly noninvasive, for debugging user processes across normal userspace channels. They both happen to talk to gdb, but that's the end of the natural "overlap". Even if kgdb was extended to be able to manage userspace, and if gdb itself was extended to be able to use that same single channel, this would still not duplicate the use scenario for an ordinary user debugging his own processes. (Plus, in the future where at least gdb is applied toward kernel+user debugging, it is unlikely to be the case that this would need to be done *over a single channel*. A separate channel for kernel and separate channels for userspace programs are no less likely.) > Btw., perf does meet that definition: it functionally replaces all > facilities that it overlaps/extends - such as Oprofile. [...] (And they currently separately coexist.) - FChE
