Hi Garry, Hi Ian,
On 10/19/2020 5:48 PM, John Garry wrote:
On 19/10/2020 00:30, Ian Rogers wrote:
On Sun, Oct 18, 2020 at 1:51 AM kernel test robot <rong.a.c...@intel.com> wrote:
Greeting,
FYI, we noticed the following commit (built with gcc-9):
commit: fcc9c5243c478f104014daf4d23db86098d2aef0 ("perf metricgroup: Hack a fix for aliases when
covering multiple PMUs")
url:
https://github.com/0day-ci/linux/commits/John-Garry/perf-pmu-events-Support-event-aliasing-for-system-PMUs/20201008-182049
in testcase: perf-sanity-tests
version: perf-x86_64-c85fb28b6f99-1_20201008
with following parameters:
perf_compiler: gcc
ucode: 0xdc
on test machine: 4 threads Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz with 32G
memory
caused below changes (please refer to attached dmesg/kmsg for entire
log/backtrace):
I believe this is a Skylake and there is a known bug in the Skylake
metric DRAM_Parallel_Reads as described here:
https://lore.kernel.org/lkml/CAP-5=fxejvaqa9qfw66cy77qb962+jbe8tt5bslooocfmod...@mail.gmail.com/
Fixing the bug needs more knowledge than what is available in manuals.
Hopefully Intel can take a look.
Thanks,
Ian
So this named patch ("perf metricgroup: Hack a fix for aliases...") is breaking test #67 on my
machine also, which is a broadwell.
I will have a look, but I was hoping that Ian would have a proper fix for this on top of ("perf
metricgroup: Fix uncore metric expressions"), which now looks to be merged.
Thanks!
I just think they are different issues.
On my KBL client, the perf test #67 is passed.
But DRAM_Parallel_Reads does have issue.
root@kbl-ppc:~# perf stat -M DRAM_Parallel_Reads -- sleep 1
event syntax error:
'{arb/event=0x80,umask=0x2/,arb/event=0x80,umask=0x2,thresh=1/}:W'
\___ unknown term 'thresh' for pmu 'uncore_arb'
valid terms:
event,edge,inv,umask,cmask,config,config1,config2,name,period,percore
Initial error:
event syntax error: '..umask=0x2/,arb/event=0x80,umask=0x2,thresh=1/}:W'
\___ Cannot find PMU `arb'. Missing kernel
support?
Usage: perf stat [<options>] [<command>]
-M, --metrics <metric/metric group list>
monitor specified metrics or metric groups (separated
by ,)
I have a patch to fix DRAM_Parallel_Reads.
After:
root@kbl-ppc:~# perf stat -M MEM_Parallel_Reads -- sleep 1
Performance counter stats for 'system wide':
3,043,952 arb/event=0x80,umask=0x2/ # 1.00 MEM_Parallel_Reads
1.000879932 seconds time elapsed
I will post the patch later.
Thanks
Jin Yao
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <rong.a.c...@intel.com>
2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 67
67: Parse and process metrics : FAILED!
2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 68
68: x86 rdpmc : Ok
2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 69
69: Convert perf time to TSC : Ok
2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 70
70: DWARF unwind : Ok
2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 71
71: x86 instruction decoder - new instructions : Ok
2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 72
72: Intel PT packet decoder : Ok
2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 73
73: x86 bp modify : Ok
2020-10-16 19:31:53 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 74
74: probe libc's inet_pton & backtrace it with ping : Ok
2020-10-16 19:31:54 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 75
75: Zstd perf.data compression/decompression : Ok
To reproduce:
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp install job.yaml # job file is attached in this email
bin/lkp run job.yaml
Thanks,
Rong Chen
.
