577 lines
11 KiB
C
577 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Test module for stress and analyze performance of vmalloc allocator.
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* (C) 2018 Uladzislau Rezki (Sony) <urezki@gmail.com>
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <linux/random.h>
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#include <linux/kthread.h>
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#include <linux/moduleparam.h>
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/rwsem.h>
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#include <linux/mm.h>
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#include <linux/rcupdate.h>
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#include <linux/slab.h>
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#define __param(type, name, init, msg) \
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static type name = init; \
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module_param(name, type, 0444); \
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MODULE_PARM_DESC(name, msg) \
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__param(int, nr_threads, 0,
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"Number of workers to perform tests(min: 1 max: USHRT_MAX)");
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__param(bool, sequential_test_order, false,
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"Use sequential stress tests order");
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__param(int, test_repeat_count, 1,
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"Set test repeat counter");
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__param(int, test_loop_count, 1000000,
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"Set test loop counter");
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__param(int, run_test_mask, INT_MAX,
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"Set tests specified in the mask.\n\n"
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"\t\tid: 1, name: fix_size_alloc_test\n"
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"\t\tid: 2, name: full_fit_alloc_test\n"
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"\t\tid: 4, name: long_busy_list_alloc_test\n"
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"\t\tid: 8, name: random_size_alloc_test\n"
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"\t\tid: 16, name: fix_align_alloc_test\n"
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"\t\tid: 32, name: random_size_align_alloc_test\n"
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"\t\tid: 64, name: align_shift_alloc_test\n"
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"\t\tid: 128, name: pcpu_alloc_test\n"
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"\t\tid: 256, name: kvfree_rcu_1_arg_vmalloc_test\n"
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"\t\tid: 512, name: kvfree_rcu_2_arg_vmalloc_test\n"
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/* Add a new test case description here. */
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);
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/*
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* Read write semaphore for synchronization of setup
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* phase that is done in main thread and workers.
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*/
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static DECLARE_RWSEM(prepare_for_test_rwsem);
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/*
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* Completion tracking for worker threads.
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*/
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static DECLARE_COMPLETION(test_all_done_comp);
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static atomic_t test_n_undone = ATOMIC_INIT(0);
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static inline void
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test_report_one_done(void)
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{
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if (atomic_dec_and_test(&test_n_undone))
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complete(&test_all_done_comp);
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}
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static int random_size_align_alloc_test(void)
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{
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unsigned long size, align, rnd;
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void *ptr;
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int i;
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for (i = 0; i < test_loop_count; i++) {
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get_random_bytes(&rnd, sizeof(rnd));
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/*
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* Maximum 1024 pages, if PAGE_SIZE is 4096.
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*/
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align = 1 << (rnd % 23);
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/*
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* Maximum 10 pages.
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*/
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size = ((rnd % 10) + 1) * PAGE_SIZE;
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ptr = __vmalloc_node(size, align, GFP_KERNEL | __GFP_ZERO, 0,
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__builtin_return_address(0));
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if (!ptr)
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return -1;
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vfree(ptr);
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}
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return 0;
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}
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/*
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* This test case is supposed to be failed.
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*/
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static int align_shift_alloc_test(void)
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{
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unsigned long align;
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void *ptr;
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int i;
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for (i = 0; i < BITS_PER_LONG; i++) {
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align = ((unsigned long) 1) << i;
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ptr = __vmalloc_node(PAGE_SIZE, align, GFP_KERNEL|__GFP_ZERO, 0,
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__builtin_return_address(0));
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if (!ptr)
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return -1;
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vfree(ptr);
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}
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return 0;
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}
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static int fix_align_alloc_test(void)
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{
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void *ptr;
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int i;
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for (i = 0; i < test_loop_count; i++) {
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ptr = __vmalloc_node(5 * PAGE_SIZE, THREAD_ALIGN << 1,
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GFP_KERNEL | __GFP_ZERO, 0,
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__builtin_return_address(0));
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if (!ptr)
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return -1;
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vfree(ptr);
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}
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return 0;
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}
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static int random_size_alloc_test(void)
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{
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unsigned int n;
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void *p;
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int i;
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for (i = 0; i < test_loop_count; i++) {
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get_random_bytes(&n, sizeof(i));
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n = (n % 100) + 1;
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p = vmalloc(n * PAGE_SIZE);
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if (!p)
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return -1;
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*((__u8 *)p) = 1;
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vfree(p);
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}
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return 0;
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}
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static int long_busy_list_alloc_test(void)
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{
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void *ptr_1, *ptr_2;
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void **ptr;
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int rv = -1;
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int i;
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ptr = vmalloc(sizeof(void *) * 15000);
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if (!ptr)
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return rv;
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for (i = 0; i < 15000; i++)
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ptr[i] = vmalloc(1 * PAGE_SIZE);
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for (i = 0; i < test_loop_count; i++) {
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ptr_1 = vmalloc(100 * PAGE_SIZE);
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if (!ptr_1)
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goto leave;
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ptr_2 = vmalloc(1 * PAGE_SIZE);
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if (!ptr_2) {
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vfree(ptr_1);
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goto leave;
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}
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*((__u8 *)ptr_1) = 0;
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*((__u8 *)ptr_2) = 1;
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vfree(ptr_1);
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vfree(ptr_2);
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}
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/* Success */
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rv = 0;
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leave:
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for (i = 0; i < 15000; i++)
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vfree(ptr[i]);
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vfree(ptr);
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return rv;
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}
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static int full_fit_alloc_test(void)
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{
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void **ptr, **junk_ptr, *tmp;
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int junk_length;
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int rv = -1;
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int i;
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junk_length = fls(num_online_cpus());
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junk_length *= (32 * 1024 * 1024 / PAGE_SIZE);
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ptr = vmalloc(sizeof(void *) * junk_length);
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if (!ptr)
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return rv;
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junk_ptr = vmalloc(sizeof(void *) * junk_length);
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if (!junk_ptr) {
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vfree(ptr);
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return rv;
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}
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for (i = 0; i < junk_length; i++) {
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ptr[i] = vmalloc(1 * PAGE_SIZE);
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junk_ptr[i] = vmalloc(1 * PAGE_SIZE);
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}
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for (i = 0; i < junk_length; i++)
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vfree(junk_ptr[i]);
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for (i = 0; i < test_loop_count; i++) {
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tmp = vmalloc(1 * PAGE_SIZE);
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if (!tmp)
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goto error;
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*((__u8 *)tmp) = 1;
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vfree(tmp);
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}
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/* Success */
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rv = 0;
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error:
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for (i = 0; i < junk_length; i++)
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vfree(ptr[i]);
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vfree(ptr);
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vfree(junk_ptr);
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return rv;
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}
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static int fix_size_alloc_test(void)
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{
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void *ptr;
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int i;
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for (i = 0; i < test_loop_count; i++) {
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ptr = vmalloc(3 * PAGE_SIZE);
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if (!ptr)
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return -1;
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*((__u8 *)ptr) = 0;
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vfree(ptr);
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}
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return 0;
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}
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static int
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pcpu_alloc_test(void)
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{
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int rv = 0;
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#ifndef CONFIG_NEED_PER_CPU_KM
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void __percpu **pcpu;
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size_t size, align;
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int i;
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pcpu = vmalloc(sizeof(void __percpu *) * 35000);
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if (!pcpu)
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return -1;
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for (i = 0; i < 35000; i++) {
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unsigned int r;
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get_random_bytes(&r, sizeof(i));
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size = (r % (PAGE_SIZE / 4)) + 1;
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/*
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* Maximum PAGE_SIZE
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*/
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get_random_bytes(&r, sizeof(i));
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align = 1 << ((i % 11) + 1);
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pcpu[i] = __alloc_percpu(size, align);
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if (!pcpu[i])
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rv = -1;
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}
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for (i = 0; i < 35000; i++)
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free_percpu(pcpu[i]);
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vfree(pcpu);
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#endif
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return rv;
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}
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struct test_kvfree_rcu {
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struct rcu_head rcu;
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unsigned char array[20];
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};
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static int
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kvfree_rcu_1_arg_vmalloc_test(void)
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{
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struct test_kvfree_rcu *p;
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int i;
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for (i = 0; i < test_loop_count; i++) {
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p = vmalloc(1 * PAGE_SIZE);
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if (!p)
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return -1;
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p->array[0] = 'a';
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kvfree_rcu(p);
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}
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return 0;
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}
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static int
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kvfree_rcu_2_arg_vmalloc_test(void)
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{
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struct test_kvfree_rcu *p;
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int i;
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for (i = 0; i < test_loop_count; i++) {
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p = vmalloc(1 * PAGE_SIZE);
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if (!p)
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return -1;
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p->array[0] = 'a';
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kvfree_rcu(p, rcu);
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}
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return 0;
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}
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struct test_case_desc {
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const char *test_name;
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int (*test_func)(void);
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};
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static struct test_case_desc test_case_array[] = {
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{ "fix_size_alloc_test", fix_size_alloc_test },
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{ "full_fit_alloc_test", full_fit_alloc_test },
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{ "long_busy_list_alloc_test", long_busy_list_alloc_test },
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{ "random_size_alloc_test", random_size_alloc_test },
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{ "fix_align_alloc_test", fix_align_alloc_test },
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{ "random_size_align_alloc_test", random_size_align_alloc_test },
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{ "align_shift_alloc_test", align_shift_alloc_test },
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{ "pcpu_alloc_test", pcpu_alloc_test },
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{ "kvfree_rcu_1_arg_vmalloc_test", kvfree_rcu_1_arg_vmalloc_test },
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{ "kvfree_rcu_2_arg_vmalloc_test", kvfree_rcu_2_arg_vmalloc_test },
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/* Add a new test case here. */
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};
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struct test_case_data {
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int test_failed;
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int test_passed;
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u64 time;
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};
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static struct test_driver {
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struct task_struct *task;
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struct test_case_data data[ARRAY_SIZE(test_case_array)];
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unsigned long start;
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unsigned long stop;
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} *tdriver;
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static void shuffle_array(int *arr, int n)
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{
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unsigned int rnd;
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int i, j, x;
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for (i = n - 1; i > 0; i--) {
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get_random_bytes(&rnd, sizeof(rnd));
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/* Cut the range. */
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j = rnd % i;
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/* Swap indexes. */
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x = arr[i];
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arr[i] = arr[j];
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arr[j] = x;
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}
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}
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static int test_func(void *private)
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{
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struct test_driver *t = private;
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int random_array[ARRAY_SIZE(test_case_array)];
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int index, i, j;
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ktime_t kt;
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u64 delta;
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for (i = 0; i < ARRAY_SIZE(test_case_array); i++)
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random_array[i] = i;
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if (!sequential_test_order)
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shuffle_array(random_array, ARRAY_SIZE(test_case_array));
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/*
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* Block until initialization is done.
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*/
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down_read(&prepare_for_test_rwsem);
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t->start = get_cycles();
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for (i = 0; i < ARRAY_SIZE(test_case_array); i++) {
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index = random_array[i];
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/*
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* Skip tests if run_test_mask has been specified.
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*/
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if (!((run_test_mask & (1 << index)) >> index))
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continue;
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kt = ktime_get();
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for (j = 0; j < test_repeat_count; j++) {
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if (!test_case_array[index].test_func())
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t->data[index].test_passed++;
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else
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t->data[index].test_failed++;
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}
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/*
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* Take an average time that test took.
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*/
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delta = (u64) ktime_us_delta(ktime_get(), kt);
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do_div(delta, (u32) test_repeat_count);
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t->data[index].time = delta;
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}
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t->stop = get_cycles();
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up_read(&prepare_for_test_rwsem);
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test_report_one_done();
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/*
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* Wait for the kthread_stop() call.
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*/
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while (!kthread_should_stop())
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msleep(10);
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return 0;
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}
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static int
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init_test_configurtion(void)
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{
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/*
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* A maximum number of workers is defined as hard-coded
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* value and set to USHRT_MAX. We add such gap just in
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* case and for potential heavy stressing.
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*/
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nr_threads = clamp(nr_threads, 1, (int) USHRT_MAX);
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/* Allocate the space for test instances. */
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tdriver = kvcalloc(nr_threads, sizeof(*tdriver), GFP_KERNEL);
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if (tdriver == NULL)
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return -1;
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if (test_repeat_count <= 0)
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test_repeat_count = 1;
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if (test_loop_count <= 0)
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test_loop_count = 1;
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return 0;
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}
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static void do_concurrent_test(void)
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{
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int i, ret;
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/*
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* Set some basic configurations plus sanity check.
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*/
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ret = init_test_configurtion();
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if (ret < 0)
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return;
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/*
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* Put on hold all workers.
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*/
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down_write(&prepare_for_test_rwsem);
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for (i = 0; i < nr_threads; i++) {
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struct test_driver *t = &tdriver[i];
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t->task = kthread_run(test_func, t, "vmalloc_test/%d", i);
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if (!IS_ERR(t->task))
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/* Success. */
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atomic_inc(&test_n_undone);
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else
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pr_err("Failed to start %d kthread\n", i);
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}
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/*
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* Now let the workers do their job.
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*/
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up_write(&prepare_for_test_rwsem);
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/*
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* Sleep quiet until all workers are done with 1 second
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* interval. Since the test can take a lot of time we
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* can run into a stack trace of the hung task. That is
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* why we go with completion_timeout and HZ value.
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*/
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do {
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ret = wait_for_completion_timeout(&test_all_done_comp, HZ);
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} while (!ret);
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for (i = 0; i < nr_threads; i++) {
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struct test_driver *t = &tdriver[i];
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int j;
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if (!IS_ERR(t->task))
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kthread_stop(t->task);
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for (j = 0; j < ARRAY_SIZE(test_case_array); j++) {
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if (!((run_test_mask & (1 << j)) >> j))
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continue;
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pr_info(
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"Summary: %s passed: %d failed: %d repeat: %d loops: %d avg: %llu usec\n",
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test_case_array[j].test_name,
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t->data[j].test_passed,
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t->data[j].test_failed,
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test_repeat_count, test_loop_count,
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t->data[j].time);
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}
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pr_info("All test took worker%d=%lu cycles\n",
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i, t->stop - t->start);
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}
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kvfree(tdriver);
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}
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static int vmalloc_test_init(void)
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{
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do_concurrent_test();
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return -EAGAIN; /* Fail will directly unload the module */
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}
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static void vmalloc_test_exit(void)
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{
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}
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module_init(vmalloc_test_init)
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module_exit(vmalloc_test_exit)
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Uladzislau Rezki");
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MODULE_DESCRIPTION("vmalloc test module");
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