We would like to make a data-driven case to integrate [AutoFDO][1] support into the Linux kernel. AutoFDO is a profile guided optimization technique that uses hardware sampling to optimize binaries. Compared to Instrumentation based FDO (iFDO), AutoFDO is significantly more user-friendly and straightforward to apply. While iFDO typically yields better profile quality and hence more performance...
Another year of work is behind us, with lots of progress across GCC, Clang, and Rust to provide the Linux kernel with a variety of security features. Let's review and discuss where we are with parity between toolchains, approaches to solving open problems, and exploring new features.
Parity reached since last year:
counted_byattribute for bounded Flexible Array Members ([GCC][1],...
This talk presents the status of the three current binary front-ends supported by...
In this activity we will first provide a very brief update on the status of the port of GNU binutils and GCC to the BPF target, with special emphasis on the level of support for extant BPF programs and the kernel BPF selftests. Then we will address a set of particular issues for which we need feedback from the BPF kernel hackers.
We are extending the CTF type format (in the GNU toolchain for several years now) by making its next file format version a superset of BTF, with the option to emit straight BTF as well; this means that the existing toolchain machinery (generation with GCC, deduplication and linking with GNU ld, reading and writing with libctf) will start working with BTF as well. (It will remain capable of...
The availability of BPF and various other tracing features in the kernel, along with upcoming features, make it possible to be very creative. Higher level tracing tools like DTrace can combine the available probes and probing mechanisms to present users with semantic probes that hide the ugly implementation details that are often quite kernel release specific.
This is especially significant...
In its simplest cases, building a kernel requires very few dependencies and can be done with a couple of make commands. However, things can get complicated very quickly: fine-tuned toolchains such as the kernel.org ones provide a wide variety to choose from, each compiler has a particular supported version range, eBPF kselftests require a...