3 files changed, 137 insertions, 0 deletions

diff --git a/tools/perf/bench/Build b/tools/perf/bench/Build
index 560eb9711ea2..dd68a40a790c 100644
--- a/tools/perf/bench/Build
+++ b/tools/perf/bench/Build
@@ -11,6 +11,7 @@ perf-y += epoll-wait.o
 perf-y += epoll-ctl.o
 perf-y += synthesize.o
 perf-y += kallsyms-parse.o
+perf-y += find-bit-bench.o
 
 perf-$(CONFIG_X86_64) += mem-memcpy-x86-64-lib.o
 perf-$(CONFIG_X86_64) += mem-memcpy-x86-64-asm.o
diff --git a/tools/perf/bench/bench.h b/tools/perf/bench/bench.h
index 49bc8ed3042a..2804812d4154 100644
--- a/tools/perf/bench/bench.h
+++ b/tools/perf/bench/bench.h
@@ -36,6 +36,7 @@ int bench_sched_pipe(int argc, const char **argv);
 int bench_syscall_basic(int argc, const char **argv);
 int bench_mem_memcpy(int argc, const char **argv);
 int bench_mem_memset(int argc, const char **argv);
+int bench_mem_find_bit(int argc, const char **argv);
 int bench_futex_hash(int argc, const char **argv);
 int bench_futex_wake(int argc, const char **argv);
 int bench_futex_wake_parallel(int argc, const char **argv);
diff --git a/tools/perf/bench/find-bit-bench.c b/tools/perf/bench/find-bit-bench.c
new file mode 100644
index 000000000000..fa90f3e9d368
--- /dev/null
+++ b/tools/perf/bench/find-bit-bench.c
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Benchmark find_next_bit and related bit operations.
+ *
+ * Copyright 2020 Google LLC.
+ */
+#include <stdlib.h>
+#include "bench.h"
+#include "../util/stat.h"
+#include <linux/bitmap.h>
+#include <linux/bitops.h>
+#include <linux/time64.h>
+#include <subcmd/parse-options.h>
+
+static unsigned int outer_iterations = 5;
+static unsigned int inner_iterations = 100000;
+
+static const struct option options[] = {
+	OPT_UINTEGER('i', "outer-iterations", &outer_iterations,
+		"Number of outerer iterations used"),
+	OPT_UINTEGER('j', "inner-iterations", &inner_iterations,
+		"Number of outerer iterations used"),
+	OPT_END()
+};
+
+static const char *const bench_usage[] = {
+	"perf bench mem find_bit <options>",
+	NULL
+};
+
+static unsigned int accumulator;
+static unsigned int use_of_val;
+
+static noinline void workload(int val)
+{
+	use_of_val += val;
+	accumulator++;
+}
+
+#if (defined(__i386__) || defined(__x86_64__)) && defined(__GCC_ASM_FLAG_OUTPUTS__)
+static bool asm_test_bit(long nr, const unsigned long *addr)
+{
+	bool oldbit;
+
+	asm volatile("bt %2,%1"
+		     : "=@ccc" (oldbit)
+		     : "m" (*(unsigned long *)addr), "Ir" (nr) : "memory");
+
+	return oldbit;
+}
+#else
+#define asm_test_bit test_bit
+#endif
+
+static int do_for_each_set_bit(unsigned int num_bits)
+{
+	unsigned long *to_test = bitmap_alloc(num_bits);
+	struct timeval start, end, diff;
+	u64 runtime_us;
+	struct stats fb_time_stats, tb_time_stats;
+	double time_average, time_stddev;
+	unsigned int bit, i, j;
+	unsigned int set_bits, skip;
+	unsigned int old;
+
+	init_stats(&fb_time_stats);
+	init_stats(&tb_time_stats);
+
+	for (set_bits = 1; set_bits <= num_bits; set_bits <<= 1) {
+		bitmap_zero(to_test, num_bits);
+		skip = num_bits / set_bits;
+		for (i = 0; i < num_bits; i += skip)
+			set_bit(i, to_test);
+
+		for (i = 0; i < outer_iterations; i++) {
+			old = accumulator;
+			gettimeofday(&start, NULL);
+			for (j = 0; j < inner_iterations; j++) {
+				for_each_set_bit(bit, to_test, num_bits)
+					workload(bit);
+			}
+			gettimeofday(&end, NULL);
+			assert(old + (inner_iterations * set_bits) == accumulator);
+			timersub(&end, &start, &diff);
+			runtime_us = diff.tv_sec * USEC_PER_SEC + diff.tv_usec;
+			update_stats(&fb_time_stats, runtime_us);
+
+			old = accumulator;
+			gettimeofday(&start, NULL);
+			for (j = 0; j < inner_iterations; j++) {
+				for (bit = 0; bit < num_bits; bit++) {
+					if (asm_test_bit(bit, to_test))
+						workload(bit);
+				}
+			}
+			gettimeofday(&end, NULL);
+			assert(old + (inner_iterations * set_bits) == accumulator);
+			timersub(&end, &start, &diff);
+			runtime_us = diff.tv_sec * USEC_PER_SEC + diff.tv_usec;
+			update_stats(&tb_time_stats, runtime_us);
+		}
+
+		printf("%d operations %d bits set of %d bits\n",
+			inner_iterations, set_bits, num_bits);
+		time_average = avg_stats(&fb_time_stats);
+		time_stddev = stddev_stats(&fb_time_stats);
+		printf("  Average for_each_set_bit took: %.3f usec (+- %.3f usec)\n",
+			time_average, time_stddev);
+		time_average = avg_stats(&tb_time_stats);
+		time_stddev = stddev_stats(&tb_time_stats);
+		printf("  Average test_bit loop took:    %.3f usec (+- %.3f usec)\n",
+			time_average, time_stddev);
+
+		if (use_of_val == accumulator)  /* Try to avoid compiler tricks. */
+			printf("\n");
+	}
+	bitmap_free(to_test);
+	return 0;
+}
+
+int bench_mem_find_bit(int argc, const char **argv)
+{
+	int err = 0, i;
+
+	argc = parse_options(argc, argv, options, bench_usage, 0);
+	if (argc) {
+		usage_with_options(bench_usage, options);
+		exit(EXIT_FAILURE);
+	}
+
+	for (i = 1; i <= 2048; i <<= 1)
+		do_for_each_set_bit(i);
+
+	return err;
+}