On Wed, Feb 24, 2021 at 10:25:38PM +0100, Toke Høiland-Jørgensen wrote: > Daniel Borkmann <daniel@xxxxxxxxxxxxx> writes: > > > On 2/24/21 8:54 PM, Luigi Rizzo wrote: > >> I prepared a BPF version of kstats[1] > >> https://github.com/luigirizzo/lr-cstats > >> that uses fentry/fexit hooks to monitor the execution time > >> of a kernel function. > >> > >> I hoped to have it working on ARM64 too, but it looks like > >> arch_prepare_bpf_trampoline() only exists for x86. > >> > >> Is there any outstanding patch for this function on ARM64, > >> or any similar function I could look at to implement it myself ? > > > > Not that I'm currently aware of, arm64 support would definitely be great > > to have. From x86 side, the underlying arch dependency was basically on > > text_poke_bp() to patch instructions on a live kernel. Haven't checked > > recently whether an equivalent exists on arm64 yet, but perhaps Will > > might know. > > Adding Jean-Philippe; I believe he is/was working on this...? Yes, I have a very rough prototype here: https://jpbrucker.net/git/linux/log/?h=bpf/devel But not a ton of time to work on it at the moment, I don't know when I'll be able to post something. Thanks, Jean
