selftests/powerpc: Import Anton's mmap & futex micro benchmarks

These are useful little loops for smoke testing performance.

Signed-off-by: Anton Blanchard <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>

tools/testing/selftests/powerpc/benchmarks/.gitignore

···
 gettimeofday
 context_switch
+mmap_bench
+futex_bench

tools/testing/selftests/powerpc/benchmarks/Makefile

···
-TEST_PROGS := gettimeofday context_switch
+TEST_PROGS := gettimeofday context_switch mmap_bench futex_bench
 
 CFLAGS += -O2
 

tools/testing/selftests/powerpc/benchmarks/futex_bench.c

···
+/*
+ * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
+ * Licensed under GPLv2.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <sys/syscall.h>
+#include <time.h>
+#include <unistd.h>
+#include <linux/futex.h>
+
+#include "utils.h"
+
+#define ITERATIONS 100000000
+
+#define futex(A, B, C, D, E, F)	 syscall(__NR_futex, A, B, C, D, E, F)
+
+int test_futex(void)
+{
+	struct timespec ts_start, ts_end;
+	unsigned long i = ITERATIONS;
+
+	clock_gettime(CLOCK_MONOTONIC, &ts_start);
+
+	while (i--) {
+		unsigned int addr = 0;
+		futex(&addr, FUTEX_WAKE, 1, NULL, NULL, 0);
+	}
+
+	clock_gettime(CLOCK_MONOTONIC, &ts_end);
+
+	printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
+
+	return 0;
+}
+
+int main(void)
+{
+	return test_harness(test_futex, "futex_bench");
+}

tools/testing/selftests/powerpc/benchmarks/mmap_bench.c

···
+/*
+ * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
+ * Licensed under GPLv2.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <time.h>
+
+#include "utils.h"
+
+#define ITERATIONS 5000000
+
+#define MEMSIZE (128 * 1024 * 1024)
+
+int test_mmap(void)
+{
+	struct timespec ts_start, ts_end;
+	unsigned long i = ITERATIONS;
+
+	clock_gettime(CLOCK_MONOTONIC, &ts_start);
+
+	while (i--) {
+		char *c = mmap(NULL, MEMSIZE, PROT_READ|PROT_WRITE,
+			       MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+		FAIL_IF(c == MAP_FAILED);
+		munmap(c, MEMSIZE);
+	}
+
+	clock_gettime(CLOCK_MONOTONIC, &ts_end);
+
+	printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
+
+	return 0;
+}
+
+int main(void)
+{
+	return test_harness(test_mmap, "mmap_bench");
+}