2025cf9e19
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 263 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.208660670@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* benchmark.c:
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* Author: Konstantin Khlebnikov <koct9i@gmail.com>
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*/
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#include <linux/radix-tree.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <time.h>
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#include "test.h"
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#define NSEC_PER_SEC 1000000000L
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static long long benchmark_iter(struct radix_tree_root *root, bool tagged)
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{
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volatile unsigned long sink = 0;
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struct radix_tree_iter iter;
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struct timespec start, finish;
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long long nsec;
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int l, loops = 1;
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void **slot;
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#ifdef BENCHMARK
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again:
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#endif
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clock_gettime(CLOCK_MONOTONIC, &start);
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for (l = 0; l < loops; l++) {
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if (tagged) {
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radix_tree_for_each_tagged(slot, root, &iter, 0, 0)
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sink ^= (unsigned long)slot;
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} else {
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radix_tree_for_each_slot(slot, root, &iter, 0)
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sink ^= (unsigned long)slot;
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}
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}
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clock_gettime(CLOCK_MONOTONIC, &finish);
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nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
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(finish.tv_nsec - start.tv_nsec);
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#ifdef BENCHMARK
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if (loops == 1 && nsec * 5 < NSEC_PER_SEC) {
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loops = NSEC_PER_SEC / nsec / 4 + 1;
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goto again;
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}
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#endif
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nsec /= loops;
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return nsec;
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}
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static void benchmark_insert(struct radix_tree_root *root,
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unsigned long size, unsigned long step)
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{
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struct timespec start, finish;
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unsigned long index;
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long long nsec;
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clock_gettime(CLOCK_MONOTONIC, &start);
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for (index = 0 ; index < size ; index += step)
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item_insert(root, index);
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clock_gettime(CLOCK_MONOTONIC, &finish);
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nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
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(finish.tv_nsec - start.tv_nsec);
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printv(2, "Size: %8ld, step: %8ld, insertion: %15lld ns\n",
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size, step, nsec);
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}
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static void benchmark_tagging(struct radix_tree_root *root,
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unsigned long size, unsigned long step)
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{
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struct timespec start, finish;
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unsigned long index;
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long long nsec;
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clock_gettime(CLOCK_MONOTONIC, &start);
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for (index = 0 ; index < size ; index += step)
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radix_tree_tag_set(root, index, 0);
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clock_gettime(CLOCK_MONOTONIC, &finish);
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nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
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(finish.tv_nsec - start.tv_nsec);
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printv(2, "Size: %8ld, step: %8ld, tagging: %17lld ns\n",
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size, step, nsec);
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}
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static void benchmark_delete(struct radix_tree_root *root,
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unsigned long size, unsigned long step)
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{
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struct timespec start, finish;
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unsigned long index;
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long long nsec;
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clock_gettime(CLOCK_MONOTONIC, &start);
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for (index = 0 ; index < size ; index += step)
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item_delete(root, index);
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clock_gettime(CLOCK_MONOTONIC, &finish);
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nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
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(finish.tv_nsec - start.tv_nsec);
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printv(2, "Size: %8ld, step: %8ld, deletion: %16lld ns\n",
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size, step, nsec);
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}
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static void benchmark_size(unsigned long size, unsigned long step)
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{
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RADIX_TREE(tree, GFP_KERNEL);
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long long normal, tagged;
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benchmark_insert(&tree, size, step);
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benchmark_tagging(&tree, size, step);
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tagged = benchmark_iter(&tree, true);
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normal = benchmark_iter(&tree, false);
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printv(2, "Size: %8ld, step: %8ld, tagged iteration: %8lld ns\n",
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size, step, tagged);
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printv(2, "Size: %8ld, step: %8ld, normal iteration: %8lld ns\n",
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size, step, normal);
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benchmark_delete(&tree, size, step);
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item_kill_tree(&tree);
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rcu_barrier();
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}
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void benchmark(void)
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{
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unsigned long size[] = {1 << 10, 1 << 20, 0};
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unsigned long step[] = {1, 2, 7, 15, 63, 64, 65,
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128, 256, 512, 12345, 0};
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int c, s;
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printv(1, "starting benchmarks\n");
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printv(1, "RADIX_TREE_MAP_SHIFT = %d\n", RADIX_TREE_MAP_SHIFT);
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for (c = 0; size[c]; c++)
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for (s = 0; step[s]; s++)
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benchmark_size(size[c], step[s]);
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}
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