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| author | Thomas Gleixner <tglx@linutronix.de> | 2018-08-05 16:39:29 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-08-05 16:39:29 +0200 |
| commit | f2701b77bbd992f3df4631de8493f21db0830452 (patch) | |
| tree | b05b2bf8b47002ae81c79aaa9de2a311b8ee075e /samples/bpf/test_overhead_user.c | |
| parent | 18b57ce2eb8c8b9a24174a89250cf5f57c76ecdc (diff) | |
| parent | acb1872577b346bd15ab3a3f8dff780d6cca4b70 (diff) | |
| download | linux-f2701b77bbd992f3df4631de8493f21db0830452.tar.bz2 | |
Merge 4.18-rc7 into master to pick up the KVM dependcy
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'samples/bpf/test_overhead_user.c')
| -rw-r--r-- | samples/bpf/test_overhead_user.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/samples/bpf/test_overhead_user.c b/samples/bpf/test_overhead_user.c index 6caf47afa635..9d6dcaa9db92 100644 --- a/samples/bpf/test_overhead_user.c +++ b/samples/bpf/test_overhead_user.c @@ -6,6 +6,7 @@ */ #define _GNU_SOURCE #include <sched.h> +#include <errno.h> #include <stdio.h> #include <sys/types.h> #include <asm/unistd.h> @@ -44,8 +45,13 @@ static void test_task_rename(int cpu) exit(1); } start_time = time_get_ns(); - for (i = 0; i < MAX_CNT; i++) - write(fd, buf, sizeof(buf)); + for (i = 0; i < MAX_CNT; i++) { + if (write(fd, buf, sizeof(buf)) < 0) { + printf("task rename failed: %s\n", strerror(errno)); + close(fd); + return; + } + } printf("task_rename:%d: %lld events per sec\n", cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); close(fd); @@ -63,8 +69,13 @@ static void test_urandom_read(int cpu) exit(1); } start_time = time_get_ns(); - for (i = 0; i < MAX_CNT; i++) - read(fd, buf, sizeof(buf)); + for (i = 0; i < MAX_CNT; i++) { + if (read(fd, buf, sizeof(buf)) < 0) { + printf("failed to read from /dev/urandom: %s\n", strerror(errno)); + close(fd); + return; + } + } printf("urandom_read:%d: %lld events per sec\n", cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); close(fd); |