On 2024/6/18 22:45, wang wei wrote:
>
>>+
>>+static struct objpool_head ptr_pool;
>>+static int nr_objs = 512;
>>+static atomic_t nthreads;
>>+static struct completion wait;
>>+static struct page_frag_cache test_frag;
>>+
>>+static int nr_test = 5120000;
>>+module_param(nr_test, int, 0600);
>
>
> "S_IRUSR | S_IWUSR" is better than "0600".
Yes, it is better.
But as we do the testing in module init, it seems we could just
use module_param(nr_test, int, 0) instead.
>
>
>>+MODULE_PARM_DESC(nr_test, "number of iterations to test");
>>+
>>+static bool test_align;
>>+module_param(test_align, bool, 0600);
>>+MODULE_PARM_DESC(test_align, "use align API for testing");
>>+
>>+static int test_alloc_len = 2048;
>>+module_param(test_alloc_len, int, 0600);
>>+MODULE_PARM_DESC(test_alloc_len, "alloc len for testing");
>>+
>>+static int test_push_cpu;
>>+module_param(test_push_cpu, int, 0600);
>>+MODULE_PARM_DESC(test_push_cpu, "test cpu for pushing fragment");
>>+
>>+static int test_pop_cpu;
>>+module_param(test_pop_cpu, int, 0600);
>>+MODULE_PARM_DESC(test_pop_cpu, "test cpu for popping fragment");
>>+
>>+static int page_frag_pop_thread(void *arg)
>>+{
>>+ struct objpool_head *pool = arg;
>>+ int nr = nr_test;
>>+
>>+ pr_info("page_frag pop test thread begins on cpu %d\n",
>>+ smp_processor_id());
>>+
>>+ while (nr > 0) {
>>+ void *obj = objpool_pop(pool);
>>+
>>+ if (obj) {
>>+ nr--;
>>+ page_frag_free(obj);
>>+ } else {
>>+ 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 objpool_head *pool = arg;
>>+ int nr = nr_test;
>>+
>>+ pr_info("page_frag push test thread begins on cpu %d\n",
>>+ smp_processor_id());
>>+
>>+ while (nr > 0) {
>>+ void *va;
>>+ int ret;
>>+
>>+ if (test_align)
>>+ va = page_frag_alloc_align(&test_frag, test_alloc_len,
>>+ GFP_KERNEL, SMP_CACHE_BYTES);
>
>
> Every page fragment max size is PAGE_FRAG_CACHE_MAX_SIZE, hence the value of test_alloc_len needs to be checked.
>
yes, that needs to be checked.
limit the test_alloc_len to PGAE_SIZE seems better, as we may fail back to
order 0 page.
>
