From 80f4759964cc70ca8e3c793afbecbdc235ce7272 Mon Sep 17 00:00:00 2001 From: "Uladzislau Rezki (Sony)" Date: Thu, 29 Apr 2021 22:59:13 -0700 Subject: lib/test_vmalloc.c: add a new 'nr_threads' parameter By using this parameter we can specify how many workers are created to perform vmalloc tests. By default it is one CPU. The maximum value is set to 1024. As a result of this change a 'single_cpu_test' one becomes obsolete, therefore it is no longer needed. [urezki@gmail.com: extend max value of nr_threads parameter] Link: https://lkml.kernel.org/r/20210406124536.19658-1-urezki@gmail.com Link: https://lkml.kernel.org/r/20210402202237.20334-2-urezki@gmail.com Signed-off-by: Uladzislau Rezki (Sony) Cc: Hillf Danton Cc: Matthew Wilcox Cc: Michal Hocko Cc: Oleksiy Avramchenko Cc: Shuah Khan Cc: Steven Rostedt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/test_vmalloc.c | 88 +++++++++++++++++++++++++----------------------------- 1 file changed, 40 insertions(+), 48 deletions(-) (limited to 'lib/test_vmalloc.c') diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c index 4eb6abdaa74e..01e9543de566 100644 --- a/lib/test_vmalloc.c +++ b/lib/test_vmalloc.c @@ -23,8 +23,8 @@ module_param(name, type, 0444); \ MODULE_PARM_DESC(name, msg) \ -__param(bool, single_cpu_test, false, - "Use single first online CPU to run tests"); +__param(int, nr_threads, 0, + "Number of workers to perform tests(min: 1 max: USHRT_MAX)"); __param(bool, sequential_test_order, false, "Use sequential stress tests order"); @@ -50,13 +50,6 @@ __param(int, run_test_mask, INT_MAX, /* Add a new test case description here. */ ); -/* - * Depends on single_cpu_test parameter. If it is true, then - * use first online CPU to trigger a test on, otherwise go with - * all online CPUs. - */ -static cpumask_t cpus_run_test_mask = CPU_MASK_NONE; - /* * Read write semaphore for synchronization of setup * phase that is done in main thread and workers. @@ -386,16 +379,13 @@ struct test_case_data { u64 time; }; -/* Split it to get rid of: WARNING: line over 80 characters */ -static struct test_case_data - per_cpu_test_data[NR_CPUS][ARRAY_SIZE(test_case_array)]; - static struct test_driver { struct task_struct *task; + struct test_case_data data[ARRAY_SIZE(test_case_array)]; + unsigned long start; unsigned long stop; - int cpu; -} per_cpu_test_driver[NR_CPUS]; +} *tdriver; static void shuffle_array(int *arr, int n) { @@ -423,9 +413,6 @@ static int test_func(void *private) ktime_t kt; u64 delta; - if (set_cpus_allowed_ptr(current, cpumask_of(t->cpu)) < 0) - pr_err("Failed to set affinity to %d CPU\n", t->cpu); - for (i = 0; i < ARRAY_SIZE(test_case_array); i++) random_array[i] = i; @@ -450,9 +437,9 @@ static int test_func(void *private) kt = ktime_get(); for (j = 0; j < test_repeat_count; j++) { if (!test_case_array[index].test_func()) - per_cpu_test_data[t->cpu][index].test_passed++; + t->data[index].test_passed++; else - per_cpu_test_data[t->cpu][index].test_failed++; + t->data[index].test_failed++; } /* @@ -461,7 +448,7 @@ static int test_func(void *private) delta = (u64) ktime_us_delta(ktime_get(), kt); do_div(delta, (u32) test_repeat_count); - per_cpu_test_data[t->cpu][index].time = delta; + t->data[index].time = delta; } t->stop = get_cycles(); @@ -477,53 +464,56 @@ static int test_func(void *private) return 0; } -static void +static int init_test_configurtion(void) { /* - * Reset all data of all CPUs. + * A maximum number of workers is defined as hard-coded + * value and set to USHRT_MAX. We add such gap just in + * case and for potential heavy stressing. */ - memset(per_cpu_test_data, 0, sizeof(per_cpu_test_data)); + nr_threads = clamp(nr_threads, 1, (int) USHRT_MAX); - if (single_cpu_test) - cpumask_set_cpu(cpumask_first(cpu_online_mask), - &cpus_run_test_mask); - else - cpumask_and(&cpus_run_test_mask, cpu_online_mask, - cpu_online_mask); + /* Allocate the space for test instances. */ + tdriver = kvcalloc(nr_threads, sizeof(*tdriver), GFP_KERNEL); + if (tdriver == NULL) + return -1; if (test_repeat_count <= 0) test_repeat_count = 1; if (test_loop_count <= 0) test_loop_count = 1; + + return 0; } static void do_concurrent_test(void) { - int cpu, ret; + int i, ret; /* * Set some basic configurations plus sanity check. */ - init_test_configurtion(); + ret = init_test_configurtion(); + if (ret < 0) + return; /* * Put on hold all workers. */ down_write(&prepare_for_test_rwsem); - for_each_cpu(cpu, &cpus_run_test_mask) { - struct test_driver *t = &per_cpu_test_driver[cpu]; + for (i = 0; i < nr_threads; i++) { + struct test_driver *t = &tdriver[i]; - t->cpu = cpu; - t->task = kthread_run(test_func, t, "vmalloc_test/%d", cpu); + t->task = kthread_run(test_func, t, "vmalloc_test/%d", i); if (!IS_ERR(t->task)) /* Success. */ atomic_inc(&test_n_undone); else - pr_err("Failed to start kthread for %d CPU\n", cpu); + pr_err("Failed to start %d kthread\n", i); } /* @@ -541,29 +531,31 @@ static void do_concurrent_test(void) ret = wait_for_completion_timeout(&test_all_done_comp, HZ); } while (!ret); - for_each_cpu(cpu, &cpus_run_test_mask) { - struct test_driver *t = &per_cpu_test_driver[cpu]; - int i; + for (i = 0; i < nr_threads; i++) { + struct test_driver *t = &tdriver[i]; + int j; if (!IS_ERR(t->task)) kthread_stop(t->task); - for (i = 0; i < ARRAY_SIZE(test_case_array); i++) { - if (!((run_test_mask & (1 << i)) >> i)) + for (j = 0; j < ARRAY_SIZE(test_case_array); j++) { + if (!((run_test_mask & (1 << j)) >> j)) continue; pr_info( "Summary: %s passed: %d failed: %d repeat: %d loops: %d avg: %llu usec\n", - test_case_array[i].test_name, - per_cpu_test_data[cpu][i].test_passed, - per_cpu_test_data[cpu][i].test_failed, + test_case_array[j].test_name, + t->data[j].test_passed, + t->data[j].test_failed, test_repeat_count, test_loop_count, - per_cpu_test_data[cpu][i].time); + t->data[j].time); } - pr_info("All test took CPU%d=%lu cycles\n", - cpu, t->stop - t->start); + pr_info("All test took worker%d=%lu cycles\n", + i, t->stop - t->start); } + + kvfree(tdriver); } static int vmalloc_test_init(void) -- cgit