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Date
1 - 2 of 2
minutes: IO Visor TSC/Dev Meeting
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Brenden Blanco
Hi All,
Thank you for joining the call today. Here are my notes from the discussion. Thanks, Brenden === Discussion === Brenden: * Plan to tag release to coincide with kernel 5.0 Brendan: * Speaking this weekend at SCaLE in Los Angeles Yonghong: * LLVM work * compile once - run anywhere WIP * support for static variables Daniel: * Global data support work in kernel continues * Ability to lock maps as read-only * bugfixes after merge window Alexei: * Some thoughts on future work of BPF * especially with introduction of BTF * overall needs concerted effort to improve debuggability * BTF for programs itself with source/type/layout information * structures for maps and global data * suggest to always require type information (already turned on by default in bcc and supported by llvm) * Some extra hoops to jump through for driver embedded BPF * to be enabled with a sysctl * kernel support is ready * some long tail of support - e.g. systemd has raw assembly BPF * kconfig option - eventual deprecation * if kernel is default strict, llvm should automatically emit BTF as well * memcg accounting patch status? * Daniel - still being worked on * proposal to enable the same accounting for verifier memory * helps to enable verifier multithreading Jakub: * question regarding global data atomicity * Daniel - requires read once / write once instructions to work properly * some todo work on documentation, interpreter + jit implementations * depends on architecture (machine word size guarantees only) Jesper: * which llvm release supports BTF * landed in December - will be in 8.0, better in 9.0 * working on tutorial for xdp at netdev * https://www.netdevconf.org/0x13/session.html?tutorial-XDP-hands-on * soliciting feedback * https://github.com/xdp-project/xdp-tutorial/ Saeed: * request to devote some time in the next meeting to iron out some XDP issues * please send an agend in reply to the reminder email before next call * prepare discussion over email in between time === Attendees === Alexei Starovoitov Marco Leogrande Mauricio Vasquez Paul Chaignon Brenden Blanco Jiong Wang Yonghong Song Daniel Borkmann Jesper Brouer Quentin Monnet Dan Siemon Jakub Kicinski Saeed John Yutaro |
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Saeed Mahameed
Hi Guys,
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My agenda for next meeting: 1) unifying and centralizing XDP statistics accounting [1]. 2) XDP resource management, User API [2]. 3) XDP meta data via btf (in kernel BTF registration). 4) all of the above issues share one common problem, which is the lack of a unified user interface without it, We really can't make a real progress. I just sent a proposal [3] for away to achieve the unified interface, please look it up and let me know your thoughts. [1] https://github.com/xdp-project/xdp-project/blob/master/xdp-project.org#statistics-per-xdp-action [2] https://github.com/xdp-project/xdp-project/blob/master/xdp-project.org#better-ndo_xdp_xmit-resource-management [3] Subject: "[RFC][Proposal] BPF Control MAP" Thanks, Saeed On Wed, Mar 6, 2019 at 12:51 PM Brenden Blanco <bblanco@...> wrote:
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