Messages in this thread | | | Date | Tue, 19 Sep 2006 18:36:56 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] Linux Kernel Markers |
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* Martin Bligh <mbligh@google.com> wrote:
> Andrew Morton wrote: > >On Tue, 19 Sep 2006 09:04:43 -0700 > >Martin Bligh <mbligh@google.com> wrote: > > > > > >>It seems like all we'd need to do > >>is "list all references to function, freeze kernel, update all > >>references, continue" > > > > > >"overwrite first 5 bytes of old function with `jmp new_function'". > > Yes, that's simple. but slower, as you have a double jump. Probably a > damned sight faster than int3 though.
modern CPUs will probably even optimize that intermediate jump away in their BTB-ish caches. But in any case this would solve the function pointer problem too.
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