There are 43 instances of posix shell tests and 35 instances of bash. To
give us a single consistent language for testing in, replace
all #!/bin/sh to #!/bin/bash. Common sources that are included in both
different shells will now work as expected. And we no longer have to fix
up bashisms that appear to work when someone's system has sh symlinked
to bash, but don't work on other systems that have both shells
installed.
Although we could have chosen sh, it's not backwards compatible so it
wouldn't be possible to bulk convert without re-writing the existing
bash tests.
Choosing bash also gives us some nicer features including 'local'
variable definitions and regexes in if statements that are already
widely used in the tests.
It's not expected that there are any users with only sh available due to
the large number of bash tests that exist.
Discussed in relation to running shellcheck here:
https://lore.kernel.org/linux-perf-users/e3751a74be34bbf3781c4644f518702a7270220b.1749785642.git.collin.funk1@gmail.com/
Signed-off-by: James Clark <james.clark@linaro.org>
Reviewed-by: Collin Funk <collin.funk1@gmail.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: https://lore.kernel.org/r/20250623-james-perf-bash-tests-v1-1-f572f54d4559@linaro.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
The test has been failing for some time when two separate runs of
perf benchmarks are recorded for cycles events and their counts are
compared, while once the recording was done with option --bpf-counters
and once without it. It is expected that the count of the samples
should be within a certain range, firstly the difference was set to be
within 10%, which was then later raised to 20%. However, the test case
keeps failing on certain architectures as recording the provided
benchmark can produce completely different counts based on the
current load of the system.
Sampling two separate runs on intel-eaglestream-spr-13 of "perf stat
--no-big-num -e cycles -- perf bench sched messaging -g 1 -l 100 -t":
Performance counter stats for 'perf bench sched messaging -g 1 -l 100 -t':
396782898 cycles
0.010051983 seconds time elapsed
0.008664000 seconds user
0.097058000 seconds sys
Performance counter stats for 'perf bench sched messaging -g 1 -l 100 -t':
1431133032 cycles
0.021803714 seconds time elapsed
0.023377000 seconds user
0.349918000 seconds sys
, which is ranging from 400mil to 1400mil samples.
Instead of recording the cycles use instructions event, which provides
more stable values. At the same time change the tested workload to one
of the provided testing workloads by perf that is not based on a
scheduler, which can provide another dependency on the current load.
Sampling instructions event with the new workload provide much more
stable results on intel-eaglestream-spr-13 of "perf stat --no-big-num
-e instructions -- perf test -w brstack":
Performance counter stats for 'perf test -w brstack':
64584494 instructions
0.009173945 seconds time elapsed
0.007262000 seconds user
0.002071000 seconds sys
Performance counter stats for 'perf test -w brstack':
64672669 instructions
0.008888135 seconds time elapsed
0.005018000 seconds user
0.004018000 seconds sys
Signed-off-by: Veronika Molnarova <vmolnaro@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: mpetlan@redhat.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240625092001.10909-1-vmolnaro@redhat.com
Add a test to compare the output of perf-stat with and without option
--bpf-counters. If the difference is more than 10%, the test is considered
as failed.
Committer testing:
# perf test bpf-counters
86: perf stat --bpf-counters test : Ok
# perf test -v bpf-counters
86: perf stat --bpf-counters test :
--- start ---
test child forked, pid 2433339
test child finished with 0
---- end ----
perf stat --bpf-counters test: Ok
#
Signed-off-by: Song Liu <songliubraving@fb.com>
Requested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/EC00E37D-8587-4662-8E30-7AD5F874FA84@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
