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| author | Song Liu <songliubraving@fb.com> | 2018-05-07 20:50:49 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-05-15 00:29:45 +0300 |
| commit | 13790d1cc72c22f6e7a1248e5f6d20d720797e95 (patch) | |
| tree | 96449dabaf9685b7cb23b07ecb0ace00b06dd251 /tools/testing/selftests/bpf/urandom_read.c | |
| parent | bae77c5eb5b2107e300fb02da2311f2aa0d8ee3c (diff) | |
| download | linux-13790d1cc72c22f6e7a1248e5f6d20d720797e95.tar.xz | |
bpf: add selftest for stackmap with build_id in NMI context
This new test captures stackmap with build_id with hardware event
PERF_COUNT_HW_CPU_CYCLES.
Because we only support one ips-to-build_id lookup per cpu in NMI
context, stack_amap will not be able to do the lookup in this test.
Therefore, we didn't do compare_stack_ips(), as it will alwasy fail.
urandom_read.c is extended to run configurable cycles so that it can be
caught by the perf event.
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/testing/selftests/bpf/urandom_read.c')
| -rw-r--r-- | tools/testing/selftests/bpf/urandom_read.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/tools/testing/selftests/bpf/urandom_read.c b/tools/testing/selftests/bpf/urandom_read.c index 4acfdebf36fa..9de8b7cb4e6d 100644 --- a/tools/testing/selftests/bpf/urandom_read.c +++ b/tools/testing/selftests/bpf/urandom_read.c @@ -6,15 +6,21 @@ #include <stdlib.h> #define BUF_SIZE 256 -int main(void) + +int main(int argc, char *argv[]) { int fd = open("/dev/urandom", O_RDONLY); int i; char buf[BUF_SIZE]; + int count = 4; if (fd < 0) return 1; - for (i = 0; i < 4; ++i) + + if (argc == 2) + count = atoi(argv[1]); + + for (i = 0; i < count; ++i) read(fd, buf, BUF_SIZE); close(fd); |