On Fri, Jan 29, 2010 at 10:11:16AM +0100, Ingo Molnar wrote: > > * Ananth N Mavinakayanahalli <ana...@in.ibm.com> wrote: > > > On Fri, Jan 29, 2010 at 08:39:07AM +0100, Ingo Molnar wrote: > > > > ... > > > > > When we merged kprobes ~10 years ago we made the (rather bad) mistake of > > > merging a raw, opaque facility and leaving 'the rest' up to some other > > > entity. > > > IBM kprobes hackers vanished the day the original kprobes code went > > > upstream > > > and the high level entity never truly materialized in-kernel, for nearly > > > a > > > decade! > > > > I don't know what you are referring to here... Kprobes was merged in 2.6.9 > > (~August 2004 -- less than 6 years ago). [...] > > Ok, 6 years then :-) > > > [...] Since then, we did work on ports to powerpc and s390. We implemented > > kretprobes. We made it much scalable using RCU; we did the powerpc booster > > to skip single-step when possible, not to mention various bug fixes over > > the > > years. > > Except it had no real in-kernel user.
Not that I want to rebut you Ingo, but there were in-kernel users since 2006 (net/ipv4/tcp_probe.c) :-) Aside, I am also glad that we have more flexibility with the perf integration. Ananth
