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authorJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-11 10:41:07 +0300
committerJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-13 08:17:18 +0300
commite09b41010ba33a20a87472ee821fa407a5b8da36 (patch)
treed10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/samples/bpf/tracex6_user.c
parentf93b97fd65072de626c074dbe099a1fff05ce060 (diff)
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page. During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/samples/bpf/tracex6_user.c')
-rw-r--r--kernel/samples/bpf/tracex6_user.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/kernel/samples/bpf/tracex6_user.c b/kernel/samples/bpf/tracex6_user.c
new file mode 100644
index 000000000..8ea4976cf
--- /dev/null
+++ b/kernel/samples/bpf/tracex6_user.c
@@ -0,0 +1,72 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <sys/ioctl.h>
+#include <linux/perf_event.h>
+#include <linux/bpf.h>
+#include "libbpf.h"
+#include "bpf_load.h"
+
+#define SAMPLE_PERIOD 0x7fffffffffffffffULL
+
+static void test_bpf_perf_event(void)
+{
+ int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
+ int *pmu_fd = malloc(nr_cpus * sizeof(int));
+ int status, i;
+
+ struct perf_event_attr attr_insn_pmu = {
+ .freq = 0,
+ .sample_period = SAMPLE_PERIOD,
+ .inherit = 0,
+ .type = PERF_TYPE_HARDWARE,
+ .read_format = 0,
+ .sample_type = 0,
+ .config = 0,/* PMU: cycles */
+ };
+
+ 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) {
+ 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);
+ }
+
+ 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[0]);
+ free(pmu_fd);
+}
+
+int main(int argc, char **argv)
+{
+ char filename[256];
+
+ snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+
+ if (load_bpf_file(filename)) {
+ printf("%s", bpf_log_buf);
+ return 1;
+ }
+
+ test_bpf_perf_event();
+ read_trace_pipe();
+
+ return 0;
+}