Messages in this thread | | | Date | Wed, 13 Nov 2019 16:10:36 +0100 (CET) | From | Miroslav Benes <> | Subject | Re: [PATCH 00/10] ftrace: Add register_ftrace_direct() |
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On Fri, 8 Nov 2019, Steven Rostedt wrote:
> > Alexei mentioned that he would like a way to access the ftrace fentry > code to jump directly to a custom eBPF trampoline instead of using > ftrace regs caller, as he said it would be faster. > > I proposed a new register_ftrace_direct() function that would allow > this to happen and still work with the ftrace infrastructure. I posted > a proof of concept patch here: > > https://lore.kernel.org/r/20191023122307.756b4978@gandalf.local.home > > This patch series is a more complete version, and the start of the > actual implementation. I haven't run it through my full test suite but > it passes my smoke tests and some other custom tests I built. > > I also realized that I need to make the sample modules depend on X86_64 > as it has inlined assembly in it that requires that dependency. > > This is based on 5.4-rc6 plus the permanent patches that prevent > a ftrace_ops from being disabled by /proc/sys/kernel/ftrace_enabled > > Below is the tree that contains this code. > > git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git > ftrace/direct > > Head SHA1: 9492654d091cb90a487ca669c58f802fa99bcd6f > > Enjoy, > > -- Steve
So I tried to run the selftests and ran into the same timeout issue we had with live patching :/
See http://lkml.kernel.org/r/20191025115041.23186-1-mbenes@suse.cz for a possible solution.
Miroslav
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