69d8bd8aa7d8906a1e922ae884d97f0bd7f1b269 perf intel-pt: Set no_aux_samples for
the tracking event
v4.14-rc1~173^2~32^2~39
91a8c5b840f2da31280e14b6268761cf14033756 perf intel-pt: Always set no branch
for dummy event
v4.14-rc1~173^2~32^2~38
** Tags added: kernel
** Information type changed from Proprietary to Public
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1730571
Title:
[Bug] Perf cannot use Intel PT and LBRs simultaneously at GLM and GLK
Status in intel:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Bug description:
Description:
An earlier kernel patch allowed enabling PT and LBR at the same time on
Goldmont.
commit ccbebba4c6bf ("perf/x86/intel/pt: Bypass PT vs. LBR exclusivity if the
core supports it")
However, users still cannot use Intel PT and LBRs simultaneously.
$ sudo perf record -e cycles,intel_pt//u -b – sleep 1
Error:
PMU Hardware doesn't support sampling/overflow-interrupts.
Commit IDs:
69d8bd8aa7d8906a1e922ae884d97f0bd7f1b269
91a8c5b840f2da31280e14b6268761cf14033756
Target Kernel: 4.14
Target Release: 18.04
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