diff options
| author | Song Liu <songliubraving@fb.com> | 2021-10-06 22:02:31 -0700 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2021-10-07 21:51:04 -0700 |
| commit | aa67fdb4643616f04cb59b6d090010c371ab1a80 (patch) | |
| tree | 17f11d2fb60a7921036df220f5b70ae12acd08ae | |
| parent | 0eb4ef88c53f7169c44b1bd2ace5389981409a60 (diff) | |
selftests/bpf: Skip the second half of get_branch_snapshot in vm
VMs running on upstream 5.12+ kernel support LBR. However,
bpf_get_branch_snapshot couldn't stop the LBR before too many entries
are flushed. Skip the hit/waste test for VMs before we find a proper fix
for LBR in VM.
Fixes: 025bd7c753aa ("selftests/bpf: Add test for bpf_get_branch_snapshot")
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211007050231.728496-1-songliubraving@fb.com
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/get_branch_snapshot.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/get_branch_snapshot.c b/tools/testing/selftests/bpf/prog_tests/get_branch_snapshot.c index 67e86f8d8677..e4f92feb7b32 100644 --- a/tools/testing/selftests/bpf/prog_tests/get_branch_snapshot.c +++ b/tools/testing/selftests/bpf/prog_tests/get_branch_snapshot.c @@ -6,6 +6,30 @@ static int *pfd_array; static int cpu_cnt; +static bool is_hypervisor(void) +{ + char *line = NULL; + bool ret = false; + size_t len; + FILE *fp; + + fp = fopen("/proc/cpuinfo", "r"); + if (!fp) + return false; + + while (getline(&line, &len, fp) != -1) { + if (!strncmp(line, "flags", 5)) { + if (strstr(line, "hypervisor") != NULL) + ret = true; + break; + } + } + + free(line); + fclose(fp); + return ret; +} + static int create_perf_events(void) { struct perf_event_attr attr = {0}; @@ -83,6 +107,16 @@ void test_get_branch_snapshot(void) goto cleanup; } + if (is_hypervisor()) { + /* As of today, LBR in hypervisor cannot be stopped before + * too many entries are flushed. Skip the hit/waste test + * for now in hypervisor until we optimize the LBR in + * hypervisor. + */ + test__skip(); + goto cleanup; + } + ASSERT_GT(skel->bss->test1_hits, 6, "find_looptest_in_lbr"); /* Given we stop LBR in software, we will waste a few entries. |