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Thomas Richter f677ec94f6 perf test: Test 17 fails with make LIBPFM4=1 on s390 z/VM

This test case fails on s390 virtual machine z/VM which has no PMU support
when the perf tool is built with LIBPFM4=1.

Using make LIBPFM4=1 builds the perf tool with support for libpfm
event notation. The command line flag --pfm-events is valid:
 # ./perf record --pfm-events cycles -- true
 [ perf record: Woken up 1 times to write data ]
 [ perf record: Captured and wrote 0.001 MB perf.data (2 samples) ]
 #

However the command 'perf test -Fv 17' fails on s390 z/VM virtual machine
with LIBPFM4=1:
  # perf test -Fv 17
  17: Setup struct perf_event_attr                                    :
  --- start ---
  .....
  running './tests/attr/test-record-group2'
  unsupp  './tests/attr/test-record-group2'
  running './tests/attr/test-record-pfm-period'
  expected exclude_hv=0, got 1
 FAILED './tests/attr/test-record-pfm-period' - match failure
 ---- end ----
 Setup struct perf_event_attr: FAILED!

When --pfm-event system is not supported, the test returns unsupported
and continues. Here is an example using a virtual machine on x86 and
Fedora 34:
 [root@f33 perf]# perf test -Fv 17
 17: Setup struct perf_event_attr                                    :
 --- start ---
 .....
 running './tests/attr/test-record-group2'
 unsupp  './tests/attr/test-record-group2'
 running './tests/attr/test-record-pfm-period'
 unsupp  './tests/attr/test-record-pfm-period'
 ....

The issue is file ./tests/attr/test-record-pfm-period
which requires perf event attribute member exclude_hv to be zero.
This is not the case on s390 where the value of exclude_hv is one when
executing on a z/VM virtual machine without PMU hardware support.

Fix this by allowing value exlucde_hv to be zero or one.

Output before:
 # /usr/bin/python ./tests/attr.py -d ./tests/attr/ -t \
	test-record-pfm-period -p ./perf  -vvv 2>&1| fgrep match
    matching [event:base-record]
    match: [event:base-record] matches []
 FAILED './tests/attr//test-record-pfm-period' - match failure
 #

Output after:
 # /usr/bin/python ./tests/attr.py -d ./tests/attr/ -t \
	test-record-pfm-period -p ./perf  -vvv 2>&1| fgrep match
    matching [event:base-record]
    match: [event:base-record] matches ['event-1-0-6', 'event-1-0-5']
  matched

Background:
Using libpfm library ends up in this function call sequence

pfm_get_perf_event_encoding()
+-- pfm_get_os_event_encoding()
    +-- pfmlib_perf_event_encode()

is called when no hardware specific PMU unit can be detected
as in the s390 z/VM virtual machine case. This uses the
"perf_events generic PMU" data structure which sets exclude_hv
to 1 per default.  Using this PMU that test case always fails.

That is the reason why exclude_hv attribute setting varies.

Version 2:

   As suggested by Ian Rogers make perf_event_attribute member
   exclude_hv more robust and accept value 0 or 1 to handle more
   test cases which might fail on s390 virtual machine z/VM.

Suggested-by: Ian Rogers <irogers@google.com>
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Sumanth Korikkar <sumanthk@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Link: http://lore.kernel.org/lkml/20210528091050.245838-1-tmricht@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2021-06-01 10:57:39 -03:00

accounting

…

arch

perf tools: Copy uapi/asm/perf_regs.h from the kernel for MIPS

2021-06-01 10:07:46 -03:00

bootconfig

tools/bootconfig: Add tracing_on support to helper scripts

2021-01-14 10:32:20 -05:00

bpf

bpftool: Add sock_release help info for cgroup attach/prog load command

2021-05-25 16:18:32 +02:00