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| author |   Kim Phillips <kim.phillips@amd.com> | 2020-03-11 14:13:21 -0500 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2020-03-12 14:08:50 +0100 |
| commit | f967140dfb7442e2db0868b03b961f9c59418a1b (patch) | |
| tree | a1ab02af8622ba16f4df0964f77d0d12dd9213ce /tools | |
| parent | Merge tag 'perf-urgent-for-mingo-5.6-20200306' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent (diff) | |
| download | wireguard-linux-f967140dfb7442e2db0868b03b961f9c59418a1b.tar.xz wireguard-linux-f967140dfb7442e2db0868b03b961f9c59418a1b.zip | |
perf/amd/uncore: Replace manual sampling check with CAP_NO_INTERRUPT flag
Enable the sampling check in kernel/events/core.c::perf_event_open(),
which returns the more appropriate -EOPNOTSUPP.
BEFORE:
$ sudo perf record -a -e instructions,l3_request_g1.caching_l3_cache_accesses true
Error:
The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (l3_request_g1.caching_l3_cache_accesses).
/bin/dmesg | grep -i perf may provide additional information.
With nothing relevant in dmesg.
AFTER:
$ sudo perf record -a -e instructions,l3_request_g1.caching_l3_cache_accesses true
Error:
l3_request_g1.caching_l3_cache_accesses: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'
Fixes: c43ca5091a37 ("perf/x86/amd: Add support for AMD NB and L2I "uncore" counters")
Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20200311191323.13124-1-kim.phillips@amd.com
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions