It's not in 6.8

Posted Mar 23, 2024 9:40 UTC (Sat) by Hi-Angel (guest, #110915)
In reply to: It's not in 6.8 by Hi-Angel
Parent article: Data-type profiling for perf

Oh, actually, sorry for the confusion, it seems that for some reason Archlinux packages updated the kernel but still didn't update `perf` utility that goes with it, Idk why. It was marked outdated 12 days ago. Anyway, please disregard my comment, will re-test it once Arch update perf to the kernel version.

It's not in 6.8

Posted Apr 5, 2024 11:50 UTC (Fri) by Hi-Angel (guest, #110915) [Link] (1 responses)

FTR, apparently there's some problem with `perf` in 6.8. I was tired of waiting for 6.8 perf to appear in Arch repos so decided to download PKGBUILD and compile it myself. Well, now I know why it takes for long for perf to get updated: it's unbuildable, the linking stage fails with (also, Idk why text below is not getting aligned, I inserted indentation before it 🤷‍♂️):

LINK perf
/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/13.2.1/../../../../lib/Scrt1.o: in function `_start':
(.text+0x1b): undefined reference to `main'
/usr/bin/ld: pmu-events/pmu-events-in.o: in function `map_for_pmu':
pmu-events.c:(.text+0x174): undefined reference to `perf_pmu__getcpuid'
/usr/bin/ld: pmu-events.c:(.text+0x1ac): undefined reference to `strcmp_cpuid_str'
/usr/bin/ld: pmu-events/pmu-events-in.o: in function `pmu_events_table__for_each_event':
(.text+0x311): undefined reference to `pmu__name_match'
/usr/bin/ld: pmu-events/pmu-events-in.o: in function `pmu_events_table__find_event':
(.text+0x4ce): undefined reference to `pmu__name_match'
/usr/bin/ld: (.text+0x5e0): undefined reference to `pmu__name_match'
/usr/bin/ld: pmu-events/pmu-events-in.o: in function `pmu_events_table__num_events':
(.text+0x6f7): undefined reference to `pmu__name_match'
/usr/bin/ld: pmu-events/pmu-events-in.o: in function `perf_pmu__find_events_table':
(.text+0xa33): undefined reference to `pmu__name_match'
/usr/bin/ld: pmu-events/pmu-events-in.o:(.text+0xae3): more undefined references to `pmu__name_match' follow
/usr/bin/ld: pmu-events/pmu-events-in.o: in function `find_core_events_table':
(.text+0xb79): undefined reference to `strcmp_cpuid_str'
/usr/bin/ld: pmu-events/pmu-events-in.o: in function `find_core_metrics_table':
(.text+0xc09): undefined reference to `strcmp_cpuid_str'
/usr/bin/ld: /home/constantine/Projects/builds/linux-tools/src/linux/tools/perf/libsymbol/libsymbol.a(libsymbol-in.o): in function `__tolower':
/home/constantine/Projects/builds/linux-tools/src/linux/tools/lib/symbol/kallsyms.c:52:(.text+0x10): undefined reference to `_ctype'
/usr/bin/ld: /home/constantine/Projects/builds/linux-tools/src/linux/tools/perf/libsymbol/libsymbol.a(libsymbol-in.o): in function `__toupper':
/home/constantine/Projects/builds/linux-tools/src/linux/tools/lib/symbol/kallsyms.c:59:(.text+0x3e): undefined reference to `_ctype'
collect2: error: ld returned 1 exit status

It's not in 6.8

Posted Apr 5, 2024 12:01 UTC (Fri) by Hi-Angel (guest, #110915) [Link]

Okay, I figured out what it's caused by: it's because I have `-flto` in default options and evidently there's some bug in `perf` that makes it break when that's defined. After removing flto I managed to compile it.