Hello, On Tue, May 06, 2025 at 09:02:20PM +0200, Salvatore Bonaccorso wrote: > Hi, > > Pasi Kallinen reported in Debian a regression with perf r5101c4 > counter, initially it was found in > https://github.com/rr-debugger/rr/issues/3949 but said to be a kernel > problem.
What's the '51' part? I don't think it's defined. $ grep . -r /sys/bus/event_source/devices/cpu/format/ /sys/bus/event_source/devices/cpu/format/event:config:0-7 /sys/bus/event_source/devices/cpu/format/pc:config:19 /sys/bus/event_source/devices/cpu/format/edge:config:18 /sys/bus/event_source/devices/cpu/format/offcore_rsp:config1:0-63 /sys/bus/event_source/devices/cpu/format/ldlat:config1:0-15 /sys/bus/event_source/devices/cpu/format/inv:config:23 /sys/bus/event_source/devices/cpu/format/umask:config:8-15 /sys/bus/event_source/devices/cpu/format/frontend:config1:0-23 /sys/bus/event_source/devices/cpu/format/cmask:config:24-31 Nothing for bit 16, 20 and 22 on the 'config' field. Is it possible to fix rr to use a correct event encoding instead? Thanks, Namhyung > > On Tue, May 06, 2025 at 07:18:39PM +0300, Pasi Kallinen wrote: > > Package: src:linux > > Version: 6.12.25-1 > > Severity: normal > > X-Debbugs-Cc: [email protected], [email protected] > > User: [email protected] > > Usertags: amd64 > > > > Dear Maintainer, > > > > perf stat -e r5101c4 true > > > > reports "not supported". > > > > The counters worked in kernel 6.11.10. > > > > I first noticed this not working when updating to 6.12.22. > > Booting back to 6.11.10, the counters work correctly. > > Does this ring a bell? > > Would you be able to bisect the changes to identify where the > behaviour changed? > > Regards, > Salvatore
