On Tue, Nov 05, 2024 at 03:23:27PM +0100, Peter Zijlstra wrote: > On Tue, Nov 05, 2024 at 02:33:59PM +0100, Jiri Olsa wrote: > > Adding interface to add special mapping for user space page that will be > > used as place holder for uprobe trampoline in following changes. > > > > The get_tramp_area(vaddr) function either finds 'callable' page or create > > new one. The 'callable' means it's reachable by call instruction (from > > vaddr argument) and is decided by each arch via new arch_uprobe_is_callable > > function. > > > > The put_tramp_area function either drops refcount or destroys the special > > mapping and all the maps are clean up when the process goes down. > > In another thread somewhere, Andrii mentioned that Meta has executables > with more than 4G of .text. This isn't going to work for them, is it? >
not if you can't reach the trampoline from the probed address jirka
