On Thursday, 1 January 2026 18:27:47 Greenwich Mean Time Javier Martinez wrote: > El 1/1/26 a las 19:18, Javier Martinez escribió: > > > El 1/1/26 a las 18:53, D. Ben Knoble escribió: > > > >> When emerging dev-util/perf (which picked up 6.14, latest stable), I > >> got a warning about my kernel config: > >> > >> > >> > >> * Checking for suitable kernel configuration options ... > >> * CONFIG_SCHED_OMIT_FRAME_POINTER: should not be set. But > >> it is. > >> * CONFIG_FRAME_POINTER: is not set when it should be. > >> * Please check to make sure these options are set correctly. > >> * Failure to do so may cause unexpected problems. > >> > >> > >> > >> I've had to adjust kernel settings a few times before for packages, > >> but I normally find the relevant nodes to enable via the wiki for the > >> package [1]. In this case, none are mentioned. There are quite a few > >> config checks in the ebuild, though I can trace these specifically to > >> cc02b6f4e4a3 (dev-util/perf: add 6.12, 2024-11-19) in the Gentoo > >> repository. > >> > >> > >> > >> Anyway, I was curious about these checks since they're warnings, and > >> after digging through the perf wiki, some bits of source code, etc., I > >> can't figure out why these configs are relevant (or even where perf > >> documents what it needs). Any tips? What might go wrong here? Or > >> "ignore for now"? > >> > >> > >> > >> [1]: https://wiki.gentoo.org/wiki/Perf > >> > >> > >> > > > > The frame pointers are useful to debug. Some time ago (between 3'5" > > diskettes and systemd just being a nightmare not real...) we usually use > > one parameter -fomit-frame-pointer to compile gentoo... > > > > Since Perf is supposed to help to know where things could go faster, is > > logic to suppose it would need to know what's happening, however, > > removing frame pointers usually did things faster xD > > > PD: DIGEST: You need to do you kernel slower to be able to use perf as > profiling tool to do your system faster..... > > Will you be able to do your system the same "%" faster while using perf > as FRAME-POINTERS reduced its performance????? > > I like too much paradoxes....
It could be you'd build it with and without. First to analyse, benchmark, test your code and eventually rebuild it without to actually use it in production.
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