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author | Kim Phillips <kim.phillips@amd.com> | 2020-03-11 14:13:21 -0500 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-20 09:07:56 +0100 |
commit | 22333af249bc9d473f99787cd0321f25ee8dfba9 (patch) | |
tree | 076f966c4338ede2f335d9d9cbe3bb32ee6d8f73 /Documentation/kernel-parameters.txt | |
parent | 135075ae4eaf211fdb4aea93b0e7e917d1627dae (diff) |
perf/amd/uncore: Replace manual sampling check with CAP_NO_INTERRUPT flag
[ Upstream commit f967140dfb7442e2db0868b03b961f9c59418a1b ]
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
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
0 files changed, 0 insertions, 0 deletions