Arnaldo Carvalho de Melo

@acmel

Linux perf tools maintainer, pahole for looking at your data structures in detail.

Maceió, Brazil
Joined April 2009

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  1. Pinned Tweet

    Detached perf tarballs are now available for released kernels, starting with 4.19.0: See instructions on how to build and enjoy the latest goodies in your system, no need to match the running kernel version.

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  2. Feb 2

    On my way to Vienna, fedora soon will have a dwarves 1.16 rpm!

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  3. Honda nem chegou no Brasil ainda e já fala português melhor que o ministro da Educação.

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  4. Jan 28

    available, go up in the dir tree and see how to build it, rpm/deb builds would be welcome?

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  5. Jan 25
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  6. Jan 25

    Jiří Olša showing what the magikal bpftrace scripts end up generating as BPF bytecode.

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  7. Jan 25
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  8. Jan 25

    If BPF is not the answer, BTF can help, current set of slides for my presentation tomorrow at 12:00:

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  9. Jan 22

    If you build network equipment and software, you should play attention. Sometimes the algorithms are useful in general software contexts as well.

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  10. Jan 22

    Sampa is how the people of this city don't like we call São Paulo.

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  11. Jan 22
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  12. Jan 22

    Travel starting, Brno, here we go! -cz

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  13. Heya heya! 9th edition of Kernel Recipes will take place in Paris, 28 to 30th september 2020. Stay tuned!

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  14. Jan 16

    Landed in northeastern South America!

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  15. Jan 16

    Got an OOPS? Figured out the type in the variable causing the oops? Got the offset? Deep in a sub struct? Got you covered with a new EXAMPLE:

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  16. Jan 16

    here, as requested :-)

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  17. Jan 16

    By popular demand: improve pahole's man page, adding info about BTF and a growing EXAMPLES section with hopefully interesting use cases: Suggestions welcome, ask if something is possible and that may end up as an EXAMPLE!

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  18. Jan 15

    W00t! $ pahole --find_pointers_to void|wc -l 770 $ pahole -f void --prefix tcp tcp_md5sig_pool: scratch $ pahole tcp_md5sig_pool struct tcp_md5sig_pool { struct ahash_request *md5_req; /* 0 8 */ void * scratch; /* 8 8 */ }

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  19. Jan 15

    Make 'pahole --contains' take into account typedefs, enums, etc in addition to structs, unions, i.e. want to know which Linux RCU data structures embed a raw spinlock? pahole --contains raw_spinlock_t --prefix rcu

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  20. Jan 15
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