Viewing profile — irogers

Just to advertise the perf tool has inbuilt flamegraph generation code these days (well leaning on D3.js). So `perf script report flamegraph` will convert a perf.data file into a f…

Agreed this is awesome, obviously sanitizers fill some of this gap currently but they aren't great with things like reference counting that RAII makes a doddle. Fwiw, here is an im…

Somewhat related, "Data-type profiling for perf": https://lwn.net/Articles/955709/

For a collection of profilers you can also check out the Profilerpedia: https://profilerpedia.markhansen.co.nz/

There are also GC techniques to make the pause shorter, for example, doing the work for the pause concurrently and then repeating it in the safepoint. The hope is that the concurre…

This is awesome work and textual being able to support terminal or web ( https://github.com/Textualize/textual-web ) also gives hope that this can be more than a terminal app. I'm …

Wouldn't all your kernel stacks then end up in whatever this handler is? Why not implement your approach and mail it to LKML :-)

prodfiler clearly has a market. It would be interesting to see the approach as something standard in the kernel tree, perhaps it can be added to perf's synthesis, etc. There is alr…

Allowing processes to sniff each others stacks has some fairly obvious security issues.

For every running application turn DWARF data into BPF maps. Does this scale?

AMD will have support in Zen4 and Linux 6.1 (which is LTS): https://lore.kernel.org/lkml/Yz%2FcpNTSacRMh1FK@gmail.com/ Further, precise events are fixed in Linux 6.2: https://lore.…

DWARF bytecode is a full VM. Do compiler writers test their DWARF output? (my experience is not - especially for architectures out of the big 2 or 3) How does the kernel access the…

This could be a great Linux perf GSoC project. Projects and mentors are being looked for: https://wiki.linuxfoundation.org/gsoc/2023-gsoc-perf

Agner speaks about memory renaming back on Zen 2: https://www.agner.org/forum/viewtopic.php?t=41 Intel Alderlake has performance events for tracking it: https://github.com/intel/pe…

Twitter: "No need to recompile with frame pointers." Web page: "always-on profiling powered by eBPF technology." BPF stack traces are gathered using frame pointers: https://github.…

This seems relevant: Future of Memory Safety Challenges and Recommendations https://advocacy.consumerreports.org/wp-content/uploads/2023... """ Case Studies 1. The Python cryptogra…

Problem with my open-source startup: https://docs.google.com/document/d/1kiW9qmNlJ9oQZM6r5o4_N54s... Worth a read and I'm sure Rui would appreciate ways to resolve this.

People try to get cute with 3-way compares. A real Java bug that inspired: https://errorprone.info/bugpattern/BadComparable public MyFile implements Comparable { ... long timestamp…

Fwiw, this would fail Android's Compatibility Test Suite: https://android.googlesource.com/platform/cts/+/3ece5ae7a51d...

Not having cognitive load motivates something like the LLAMA work: https://research.google/pubs/pub49008/

The Linux Foundation also has projects in the Google Summer-of-Code (GSoC): https://wiki.linuxfoundation.org/gsoc/google-summer-code-202... In 2022 GSoC is expanding eligibility to…

It can catch people by surprise that Java's narrowing conversions may not preserve the sign. For example, the following is broken: class TimestampedObject implements Comparable { l…

String should be an interface/protocol. When I log a message, I want to pass a string. If I have to append large strings for a log message I don't want to run out of memory, I shou…

Given there is before and after code, perhaps the translation can be automated. If the whole code base were auto-translated, what bugs could be detected and fed back to the C imple…