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| author | Thomas Richter <tmricht@linux.vnet.ibm.com> | 2018-02-13 18:14:19 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-02-16 21:16:57 +0300 |
| commit | b3be39c51cc58eb60c698cf64987e9d465a9263a (patch) | |
| tree | c73bbcf06b38f6d1459dbf072cf3b17179ddbf66 /tools/perf/tests | |
| parent | 4cb7d3ecfca90684ad00f893c34a2028fcc5f764 (diff) | |
| download | linux-b3be39c51cc58eb60c698cf64987e9d465a9263a.tar.xz | |
perf test: Fix test case 23 for s390 z/VM or KVM guests
On s390 perf can be executed on a LPAR with support for hardware events
(i. e. cycles) or on a z/VM or KVM guest where no hardware events are
supported. In this environment use software event named cpu-clock for
this test case.
Use the cpuid infrastructure functions to determine the cpuid on s390
which contains an indication of the cpu counter facility availability.
Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Link: http://lkml.kernel.org/r/20180213151419.80737-4-tmricht@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/tests')
| -rw-r--r-- | tools/perf/tests/code-reading.c | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c index 3bf7b145b826..c7115d369511 100644 --- a/tools/perf/tests/code-reading.c +++ b/tools/perf/tests/code-reading.c @@ -482,6 +482,34 @@ static void fs_something(void) } } +static const char *do_determine_event(bool excl_kernel) +{ + const char *event = excl_kernel ? "cycles:u" : "cycles"; + +#ifdef __s390x__ + char cpuid[128], model[16], model_c[16], cpum_cf_v[16]; + unsigned int family; + int ret, cpum_cf_a; + + if (get_cpuid(cpuid, sizeof(cpuid))) + goto out_clocks; + ret = sscanf(cpuid, "%*[^,],%u,%[^,],%[^,],%[^,],%x", &family, model_c, + model, cpum_cf_v, &cpum_cf_a); + if (ret != 5) /* Not available */ + goto out_clocks; + if (excl_kernel && (cpum_cf_a & 4)) + return event; + if (!excl_kernel && (cpum_cf_a & 2)) + return event; + + /* Fall through: missing authorization */ +out_clocks: + event = excl_kernel ? "cpu-clock:u" : "cpu-clock"; + +#endif + return event; +} + static void do_something(void) { fs_something(); @@ -592,10 +620,7 @@ static int do_test_code_reading(bool try_kcore) perf_evlist__set_maps(evlist, cpus, threads); - if (excl_kernel) - str = "cycles:u"; - else - str = "cycles"; + str = do_determine_event(excl_kernel); pr_debug("Parsing event '%s'\n", str); ret = parse_events(evlist, str, NULL); if (ret < 0) { |