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// SPDX-License-Identifier: GPL-2.0
/*
* Test module for page_frag cache
*
* Copyright (C) 2024 Yunsheng Lin <linyunsheng@huawei.com>
*/
#include <linux/module.h>
#include <linux/cpumask.h>
#include <linux/completion.h>
#include <linux/ptr_ring.h>
#include <linux/kthread.h>
#include <linux/page_frag_cache.h>
#define TEST_FAILED_PREFIX "page_frag_test failed: "
static struct ptr_ring ptr_ring;
static int nr_objs = 512;
static atomic_t nthreads;
static struct completion wait;
static struct page_frag_cache test_nc;
static int test_popped;
static int test_pushed;
static bool force_exit;
static int nr_test = 2000000;
module_param(nr_test, int, 0);
MODULE_PARM_DESC(nr_test, "number of iterations to test");
static bool test_align;
module_param(test_align, bool, 0);
MODULE_PARM_DESC(test_align, "use align API for testing");
static int test_alloc_len = 2048;
module_param(test_alloc_len, int, 0);
MODULE_PARM_DESC(test_alloc_len, "alloc len for testing");
static int test_push_cpu;
module_param(test_push_cpu, int, 0);
MODULE_PARM_DESC(test_push_cpu, "test cpu for pushing fragment");
static int test_pop_cpu;
module_param(test_pop_cpu, int, 0);
MODULE_PARM_DESC(test_pop_cpu, "test cpu for popping fragment");
static int page_frag_pop_thread(void *arg)
{
struct ptr_ring *ring = arg;
pr_info("page_frag pop test thread begins on cpu %d\n",
smp_processor_id());
while (test_popped < nr_test) {
void *obj = __ptr_ring_consume(ring);
if (obj) {
test_popped++;
page_frag_free(obj);
} else {
if (force_exit)
break;
cond_resched();
}
}
if (atomic_dec_and_test(&nthreads))
complete(&wait);
pr_info("page_frag pop test thread exits on cpu %d\n",
smp_processor_id());
return 0;
}
static int page_frag_push_thread(void *arg)
{
struct ptr_ring *ring = arg;
pr_info("page_frag push test thread begins on cpu %d\n",
smp_processor_id());
while (test_pushed < nr_test && !force_exit) {
void *va;
int ret;
if (test_align) {
va = page_frag_alloc_align(&test_nc, test_alloc_len,
GFP_KERNEL, SMP_CACHE_BYTES);
if ((unsigned long)va & (SMP_CACHE_BYTES - 1)) {
force_exit = true;
WARN_ONCE(true, TEST_FAILED_PREFIX "unaligned va returned\n");
}
} else {
va = page_frag_alloc(&test_nc, test_alloc_len, GFP_KERNEL);
}
if (!va)
continue;
ret = __ptr_ring_produce(ring, va);
if (ret) {
page_frag_free(va);
cond_resched();
} else {
test_pushed++;
}
}
pr_info("page_frag push test thread exits on cpu %d\n",
smp_processor_id());
if (atomic_dec_and_test(&nthreads))
complete(&wait);
return 0;
}
static int __init page_frag_test_init(void)
{
struct task_struct *tsk_push, *tsk_pop;
int last_pushed = 0, last_popped = 0;
ktime_t start;
u64 duration;
int ret;
page_frag_cache_init(&test_nc);
atomic_set(&nthreads, 2);
init_completion(&wait);
if (test_alloc_len > PAGE_SIZE || test_alloc_len <= 0 ||
!cpu_active(test_push_cpu) || !cpu_active(test_pop_cpu))
return -EINVAL;
ret = ptr_ring_init(&ptr_ring, nr_objs, GFP_KERNEL);
if (ret)
return ret;
tsk_push = kthread_create_on_cpu(page_frag_push_thread, &ptr_ring,
test_push_cpu, "page_frag_push");
if (IS_ERR(tsk_push))
return PTR_ERR(tsk_push);
tsk_pop = kthread_create_on_cpu(page_frag_pop_thread, &ptr_ring,
test_pop_cpu, "page_frag_pop");
if (IS_ERR(tsk_pop)) {
kthread_stop(tsk_push);
return PTR_ERR(tsk_pop);
}
start = ktime_get();
wake_up_process(tsk_push);
wake_up_process(tsk_pop);
pr_info("waiting for test to complete\n");
while (!wait_for_completion_timeout(&wait, msecs_to_jiffies(10000))) {
/* exit if there is no progress for push or pop size */
if (last_pushed == test_pushed || last_popped == test_popped) {
WARN_ONCE(true, TEST_FAILED_PREFIX "no progress\n");
force_exit = true;
continue;
}
last_pushed = test_pushed;
last_popped = test_popped;
pr_info("page_frag_test progress: pushed = %d, popped = %d\n",
test_pushed, test_popped);
}
if (force_exit) {
pr_err(TEST_FAILED_PREFIX "exit with error\n");
goto out;
}
duration = (u64)ktime_us_delta(ktime_get(), start);
pr_info("%d of iterations for %s testing took: %lluus\n", nr_test,
test_align ? "aligned" : "non-aligned", duration);
out:
ptr_ring_cleanup(&ptr_ring, NULL);
page_frag_cache_drain(&test_nc);
return -EAGAIN;
}
static void __exit page_frag_test_exit(void)
{
}
module_init(page_frag_test_init);
module_exit(page_frag_test_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Yunsheng Lin <linyunsheng@huawei.com>");
MODULE_DESCRIPTION("Test module for page_frag");
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