** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
** Changed in: ubuntu-z-systems
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1865858
Title:
[20.04 FEAT] Enable proper kprobes on ftrace support
Status in Ubuntu on IBM z Systems:
Fix Committed
Status in linux package in Ubuntu:
Fix Committed
Bug description:
Our architecture backend already provides kprobes on ftrace support by
allowing to setting a kprobe on the first instruction even if it is
the ftrace nop or ftrace mcount instruction block.
This however still means that an illegal instruction is placed to the
first instruction, which causes an exception and subsequent single
stepping of the replaced instruction.
With proper kprobes on ftrace support there won't be an exception nor
any single stepping - which means that kprobes placed at the first
instruction will be much faster than now.
As a side effect by implementing this both the ftrace as well as the
kprobes code will get a bit simpler.
Mandatory requirement for Performance Measurements!
Code available with kernel 5.6
https://github.com/torvalds/linux/commit/657480d9c01574d1e11bbb29e725db9907daf782
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