On Tue, 12 Nov 2013 16:25:26 +0530 Sandeepa Prabhu sandeepa.prabhu@linaro.org wrote:
BTW, I'm currently trying a general housecleaning of __kprobes annotations. It may also have impact on your patch. https://lkml.org/lkml/2013/11/8/187
Hmm, we can help testing your patchset on arm64 platforms. Also have many doubts on the changes you are working [blacklisting probes etc]
Basically I had tried placing kprobe on memcpy() and the model hung (insmod never returned back!). Fast-model I have does not have option of any debug so no clue what happened!. memcpy() is low-level call being used internally within kprobes, so probably we cannot handle probe on that routine, but then how to make sure all such API are rejected by kprobe sub-system ?
Working on ports of ftrace, I found that many of the functions in lib/ are used by several locations that just can't be traced, due to how low level they are. I just simply blacklisted the entire lib/ directory (See the top of lib/Makefile)
I wonder if there's an easy way to blacklist entire directories from being used by kprobes too. Or at least do it by a file per file basis.
-- Steve