diff options
author | Kaixu Xia <xiakaixu@huawei.com> | 2015-08-12 09:37:53 +0000 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2015-08-12 16:39:12 -0700 |
commit | 5ed3ccbd5ac11414d61c16182718e68868becc16 (patch) | |
tree | df41b5ddd7767528d1a26b204dca9586c9008524 /samples/bpf | |
parent | 47b344b27a003fcdaccbdc07b3d558a7ccdfec04 (diff) | |
download | blackbird-op-linux-5ed3ccbd5ac11414d61c16182718e68868becc16.tar.gz blackbird-op-linux-5ed3ccbd5ac11414d61c16182718e68868becc16.zip |
bpf: fix build warnings and add function read_trace_pipe()
There are two improvements in this patch:
1. Fix the build warnings;
2. Add function read_trace_pipe() to print the result on
the screen;
Before this patch, we can get the result through /sys/kernel/de
bug/tracing/trace_pipe and get nothing on the screen.
By applying this patch, the result can be printed on the screen.
$ ./tracex6
...
tracex6-705 [003] d..1 131.428593: : CPU-3 19981414
sshd-683 [000] d..1 131.428727: : CPU-0 221682321
sshd-683 [000] d..1 131.428821: : CPU-0 221808766
sshd-683 [000] d..1 131.428950: : CPU-0 221982984
sshd-683 [000] d..1 131.429045: : CPU-0 222111851
tracex6-705 [003] d..1 131.429168: : CPU-3 20757551
sshd-683 [000] d..1 131.429170: : CPU-0 222281240
sshd-683 [000] d..1 131.429261: : CPU-0 222403340
sshd-683 [000] d..1 131.429378: : CPU-0 222561024
...
Signed-off-by: Kaixu Xia <xiakaixu@huawei.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf')
-rw-r--r-- | samples/bpf/tracex6_kern.c | 1 | ||||
-rw-r--r-- | samples/bpf/tracex6_user.c | 22 |
2 files changed, 14 insertions, 9 deletions
diff --git a/samples/bpf/tracex6_kern.c b/samples/bpf/tracex6_kern.c index 23d1cffaf249..be479c4af9e2 100644 --- a/samples/bpf/tracex6_kern.c +++ b/samples/bpf/tracex6_kern.c @@ -1,3 +1,4 @@ +#include <linux/ptrace.h> #include <linux/version.h> #include <uapi/linux/bpf.h> #include "bpf_helpers.h" diff --git a/samples/bpf/tracex6_user.c b/samples/bpf/tracex6_user.c index 928f05eaa304..8ea4976cfcf1 100644 --- a/samples/bpf/tracex6_user.c +++ b/samples/bpf/tracex6_user.c @@ -17,8 +17,7 @@ static void test_bpf_perf_event(void) { int nr_cpus = sysconf(_SC_NPROCESSORS_CONF); int *pmu_fd = malloc(nr_cpus * sizeof(int)); - unsigned long value; - int i; + int status, i; struct perf_event_attr attr_insn_pmu = { .freq = 0, @@ -32,22 +31,26 @@ static void test_bpf_perf_event(void) for (i = 0; i < nr_cpus; i++) { pmu_fd[i] = perf_event_open(&attr_insn_pmu, -1/*pid*/, i/*cpu*/, -1/*group_fd*/, 0); - if (pmu_fd[i] < 0) + if (pmu_fd[i] < 0) { printf("event syscall failed\n"); + goto exit; + } bpf_update_elem(map_fd[0], &i, &pmu_fd[i], BPF_ANY); ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE, 0); } - system("ls"); - system("pwd"); - system("sleep 2"); + status = system("ls > /dev/null"); + if (status) + goto exit; + status = system("sleep 2"); + if (status) + goto exit; +exit: for (i = 0; i < nr_cpus; i++) close(pmu_fd[i]); - - close(map_fd); - + close(map_fd[0]); free(pmu_fd); } @@ -63,6 +66,7 @@ int main(int argc, char **argv) } test_bpf_perf_event(); + read_trace_pipe(); return 0; } |