diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 11 | ||||
| -rw-r--r-- | lib/Makefile | 4 | ||||
| -rw-r--r-- | lib/objpool.c | 280 | ||||
| -rw-r--r-- | lib/test_objpool.c | 690 |
4 files changed, 984 insertions, 1 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 40b77c437a74..cc7d53d9dc01 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2954,6 +2954,17 @@ config TEST_CLOCKSOURCE_WATCHDOG If unsure, say N. +config TEST_OBJPOOL + tristate "Test module for correctness and stress of objpool" + default n + depends on m && DEBUG_KERNEL + help + This builds the "test_objpool" module that should be used for + correctness verification and concurrent testings of objects + allocation and reclamation. + + If unsure, say N. + endif # RUNTIME_TESTING_MENU config ARCH_USE_MEMTEST diff --git a/lib/Makefile b/lib/Makefile index 1b311c7fd32b..9e0972f7b764 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -34,7 +34,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \ is_single_threaded.o plist.o decompress.o kobject_uevent.o \ earlycpio.o seq_buf.o siphash.o dec_and_lock.o \ nmi_backtrace.o win_minmax.o memcat_p.o \ - buildid.o + buildid.o objpool.o lib-$(CONFIG_PRINTK) += dump_stack.o lib-$(CONFIG_SMP) += cpumask.o @@ -107,6 +107,8 @@ obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o obj-$(CONFIG_TEST_REF_TRACKER) += test_ref_tracker.o CFLAGS_test_fprobe.o += $(CC_FLAGS_FTRACE) obj-$(CONFIG_FPROBE_SANITY_TEST) += test_fprobe.o +obj-$(CONFIG_TEST_OBJPOOL) += test_objpool.o + # # CFLAGS for compiling floating point code inside the kernel. x86/Makefile turns # off the generation of FPU/SSE* instructions for kernel proper but FPU_FLAGS diff --git a/lib/objpool.c b/lib/objpool.c new file mode 100644 index 000000000000..ce0087f64400 --- /dev/null +++ b/lib/objpool.c @@ -0,0 +1,280 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/objpool.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/atomic.h> +#include <linux/irqflags.h> +#include <linux/cpumask.h> +#include <linux/log2.h> + +/* + * objpool: ring-array based lockless MPMC/FIFO queues + * + * Copyright: wuqiang.matt@bytedance.com,mhiramat@kernel.org + */ + +/* initialize percpu objpool_slot */ +static int +objpool_init_percpu_slot(struct objpool_head *pool, + struct objpool_slot *slot, + int nodes, void *context, + objpool_init_obj_cb objinit) +{ + void *obj = (void *)&slot->entries[pool->capacity]; + int i; + + /* initialize elements of percpu objpool_slot */ + slot->mask = pool->capacity - 1; + + for (i = 0; i < nodes; i++) { + if (objinit) { + int rc = objinit(obj, context); + if (rc) + return rc; + } + slot->entries[slot->tail & slot->mask] = obj; + obj = obj + pool->obj_size; + slot->tail++; + slot->last = slot->tail; + pool->nr_objs++; + } + + return 0; +} + +/* allocate and initialize percpu slots */ +static int +objpool_init_percpu_slots(struct objpool_head *pool, int nr_objs, + void *context, objpool_init_obj_cb objinit) +{ + int i, cpu_count = 0; + + for (i = 0; i < pool->nr_cpus; i++) { + + struct objpool_slot *slot; + int nodes, size, rc; + + /* skip the cpu node which could never be present */ + if (!cpu_possible(i)) + continue; + + /* compute how many objects to be allocated with this slot */ + nodes = nr_objs / num_possible_cpus(); + if (cpu_count < (nr_objs % num_possible_cpus())) + nodes++; + cpu_count++; + + size = struct_size(slot, entries, pool->capacity) + + pool->obj_size * nodes; + + /* + * here we allocate percpu-slot & objs together in a single + * allocation to make it more compact, taking advantage of + * warm caches and TLB hits. in default vmalloc is used to + * reduce the pressure of kernel slab system. as we know, + * mimimal size of vmalloc is one page since vmalloc would + * always align the requested size to page size + */ + if (pool->gfp & GFP_ATOMIC) + slot = kmalloc_node(size, pool->gfp, cpu_to_node(i)); + else + slot = __vmalloc_node(size, sizeof(void *), pool->gfp, + cpu_to_node(i), __builtin_return_address(0)); + if (!slot) + return -ENOMEM; + memset(slot, 0, size); + pool->cpu_slots[i] = slot; + + /* initialize the objpool_slot of cpu node i */ + rc = objpool_init_percpu_slot(pool, slot, nodes, context, objinit); + if (rc) + return rc; + } + + return 0; +} + +/* cleanup all percpu slots of the object pool */ +static void objpool_fini_percpu_slots(struct objpool_head *pool) +{ + int i; + + if (!pool->cpu_slots) + return; + + for (i = 0; i < pool->nr_cpus; i++) + kvfree(pool->cpu_slots[i]); + kfree(pool->cpu_slots); +} + +/* initialize object pool and pre-allocate objects */ +int objpool_init(struct objpool_head *pool, int nr_objs, int object_size, + gfp_t gfp, void *context, objpool_init_obj_cb objinit, + objpool_fini_cb release) +{ + int rc, capacity, slot_size; + + /* check input parameters */ + if (nr_objs <= 0 || nr_objs > OBJPOOL_NR_OBJECT_MAX || + object_size <= 0 || object_size > OBJPOOL_OBJECT_SIZE_MAX) + return -EINVAL; + + /* align up to unsigned long size */ + object_size = ALIGN(object_size, sizeof(long)); + + /* calculate capacity of percpu objpool_slot */ + capacity = roundup_pow_of_two(nr_objs); + if (!capacity) + return -EINVAL; + + /* initialize objpool pool */ + memset(pool, 0, sizeof(struct objpool_head)); + pool->nr_cpus = nr_cpu_ids; + pool->obj_size = object_size; + pool->capacity = capacity; + pool->gfp = gfp & ~__GFP_ZERO; + pool->context = context; + pool->release = release; + slot_size = pool->nr_cpus * sizeof(struct objpool_slot); + pool->cpu_slots = kzalloc(slot_size, pool->gfp); + if (!pool->cpu_slots) + return -ENOMEM; + + /* initialize per-cpu slots */ + rc = objpool_init_percpu_slots(pool, nr_objs, context, objinit); + if (rc) + objpool_fini_percpu_slots(pool); + else + refcount_set(&pool->ref, pool->nr_objs + 1); + + return rc; +} +EXPORT_SYMBOL_GPL(objpool_init); + +/* adding object to slot, abort if the slot was already full */ +static inline int +objpool_try_add_slot(void *obj, struct objpool_head *pool, int cpu) +{ + struct objpool_slot *slot = pool->cpu_slots[cpu]; + uint32_t head, tail; + + /* loading tail and head as a local snapshot, tail first */ + tail = READ_ONCE(slot->tail); + + do { + head = READ_ONCE(slot->head); + /* fault caught: something must be wrong */ + WARN_ON_ONCE(tail - head > pool->nr_objs); + } while (!try_cmpxchg_acquire(&slot->tail, &tail, tail + 1)); + + /* now the tail position is reserved for the given obj */ + WRITE_ONCE(slot->entries[tail & slot->mask], obj); + /* update sequence to make this obj available for pop() */ + smp_store_release(&slot->last, tail + 1); + + return 0; +} + +/* reclaim an object to object pool */ +int objpool_push(void *obj, struct objpool_head *pool) +{ + unsigned long flags; + int rc; + + /* disable local irq to avoid preemption & interruption */ + raw_local_irq_save(flags); + rc = objpool_try_add_slot(obj, pool, raw_smp_processor_id()); + raw_local_irq_restore(flags); + + return rc; +} +EXPORT_SYMBOL_GPL(objpool_push); + +/* try to retrieve object from slot */ +static inline void *objpool_try_get_slot(struct objpool_head *pool, int cpu) +{ + struct objpool_slot *slot = pool->cpu_slots[cpu]; + /* load head snapshot, other cpus may change it */ + uint32_t head = smp_load_acquire(&slot->head); + + while (head != READ_ONCE(slot->last)) { + void *obj; + + /* obj must be retrieved before moving forward head */ + obj = READ_ONCE(slot->entries[head & slot->mask]); + + /* move head forward to mark it's consumption */ + if (try_cmpxchg_release(&slot->head, &head, head + 1)) + return obj; + } + + return NULL; +} + +/* allocate an object from object pool */ +void *objpool_pop(struct objpool_head *pool) +{ + void *obj = NULL; + unsigned long flags; + int i, cpu; + + /* disable local irq to avoid preemption & interruption */ + raw_local_irq_save(flags); + + cpu = raw_smp_processor_id(); + for (i = 0; i < num_possible_cpus(); i++) { + obj = objpool_try_get_slot(pool, cpu); + if (obj) + break; + cpu = cpumask_next_wrap(cpu, cpu_possible_mask, -1, 1); + } + raw_local_irq_restore(flags); + + return obj; +} +EXPORT_SYMBOL_GPL(objpool_pop); + +/* release whole objpool forcely */ +void objpool_free(struct objpool_head *pool) +{ + if (!pool->cpu_slots) + return; + + /* release percpu slots */ + objpool_fini_percpu_slots(pool); + + /* call user's cleanup callback if provided */ + if (pool->release) + pool->release(pool, pool->context); +} +EXPORT_SYMBOL_GPL(objpool_free); + +/* drop the allocated object, rather reclaim it to objpool */ +int objpool_drop(void *obj, struct objpool_head *pool) +{ + if (!obj || !pool) + return -EINVAL; + + if (refcount_dec_and_test(&pool->ref)) { + objpool_free(pool); + return 0; + } + + return -EAGAIN; +} +EXPORT_SYMBOL_GPL(objpool_drop); + +/* drop unused objects and defref objpool for releasing */ +void objpool_fini(struct objpool_head *pool) +{ + int count = 1; /* extra ref for objpool itself */ + + /* drop all remained objects from objpool */ + while (objpool_pop(pool)) + count++; + + if (refcount_sub_and_test(count, &pool->ref)) + objpool_free(pool); +} +EXPORT_SYMBOL_GPL(objpool_fini); diff --git a/lib/test_objpool.c b/lib/test_objpool.c new file mode 100644 index 000000000000..a94078402138 --- /dev/null +++ b/lib/test_objpool.c @@ -0,0 +1,690 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Test module for lockless object pool + * + * Copyright: wuqiang.matt@bytedance.com + */ + +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/completion.h> +#include <linux/kthread.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/delay.h> +#include <linux/hrtimer.h> +#include <linux/objpool.h> + +#define OT_NR_MAX_BULK (16) + +/* memory usage */ +struct ot_mem_stat { + atomic_long_t alloc; + atomic_long_t free; +}; + +/* object allocation results */ +struct ot_obj_stat { + unsigned long nhits; + unsigned long nmiss; +}; + +/* control & results per testcase */ +struct ot_data { + struct rw_semaphore start; + struct completion wait; + struct completion rcu; + atomic_t nthreads ____cacheline_aligned_in_smp; + atomic_t stop ____cacheline_aligned_in_smp; + struct ot_mem_stat kmalloc; + struct ot_mem_stat vmalloc; + struct ot_obj_stat objects; + u64 duration; +}; + +/* testcase */ +struct ot_test { + int async; /* synchronous or asynchronous */ + int mode; /* only mode 0 supported */ + int objsz; /* object size */ + int duration; /* ms */ + int delay; /* ms */ + int bulk_normal; + int bulk_irq; + unsigned long hrtimer; /* ms */ + const char *name; + struct ot_data data; +}; + +/* per-cpu worker */ +struct ot_item { + struct objpool_head *pool; /* pool head */ + struct ot_test *test; /* test parameters */ + + void (*worker)(struct ot_item *item, int irq); + + /* hrtimer control */ + ktime_t hrtcycle; + struct hrtimer hrtimer; + + int bulk[2]; /* for thread and irq */ + int delay; + u32 niters; + + /* summary per thread */ + struct ot_obj_stat stat[2]; /* thread and irq */ + u64 duration; +}; + +/* + * memory leakage checking + */ + +static void *ot_kzalloc(struct ot_test *test, long size) +{ + void *ptr = kzalloc(size, GFP_KERNEL); + + if (ptr) + atomic_long_add(size, &test->data.kmalloc.alloc); + return ptr; +} + +static void ot_kfree(struct ot_test *test, void *ptr, long size) +{ + if (!ptr) + return; + atomic_long_add(size, &test->data.kmalloc.free); + kfree(ptr); +} + +static void ot_mem_report(struct ot_test *test) +{ + long alloc, free; + + pr_info("memory allocation summary for %s\n", test->name); + + alloc = atomic_long_read(&test->data.kmalloc.alloc); + free = atomic_long_read(&test->data.kmalloc.free); + pr_info(" kmalloc: %lu - %lu = %lu\n", alloc, free, alloc - free); + + alloc = atomic_long_read(&test->data.vmalloc.alloc); + free = atomic_long_read(&test->data.vmalloc.free); + pr_info(" vmalloc: %lu - %lu = %lu\n", alloc, free, alloc - free); +} + +/* user object instance */ +struct ot_node { + void *owner; + unsigned long data; + unsigned long refs; + unsigned long payload[32]; +}; + +/* user objpool manager */ +struct ot_context { + struct objpool_head pool; /* objpool head */ + struct ot_test *test; /* test parameters */ + void *ptr; /* user pool buffer */ + unsigned long size; /* buffer size */ + struct rcu_head rcu; +}; + +static DEFINE_PER_CPU(struct ot_item, ot_pcup_items); + +static int ot_init_data(struct ot_data *data) +{ + memset(data, 0, sizeof(*data)); + init_rwsem(&data->start); + init_completion(&data->wait); + init_completion(&data->rcu); + atomic_set(&data->nthreads, 1); + + return 0; +} + +static int ot_init_node(void *nod, void *context) +{ + struct ot_context *sop = context; + struct ot_node *on = nod; + + on->owner = &sop->pool; + return 0; +} + +static enum hrtimer_restart ot_hrtimer_handler(struct hrtimer *hrt) +{ + struct ot_item *item = container_of(hrt, struct ot_item, hrtimer); + struct ot_test *test = item->test; + + if (atomic_read_acquire(&test->data.stop)) + return HRTIMER_NORESTART; + + /* do bulk-testings for objects pop/push */ + item->worker(item, 1); + + hrtimer_forward(hrt, hrt->base->get_time(), item->hrtcycle); + return HRTIMER_RESTART; +} + +static void ot_start_hrtimer(struct ot_item *item) +{ + if (!item->test->hrtimer) + return; + hrtimer_start(&item->hrtimer, item->hrtcycle, HRTIMER_MODE_REL); +} + +static void ot_stop_hrtimer(struct ot_item *item) +{ + if (!item->test->hrtimer) + return; + hrtimer_cancel(&item->hrtimer); +} + +static int ot_init_hrtimer(struct ot_item *item, unsigned long hrtimer) +{ + struct hrtimer *hrt = &item->hrtimer; + + if (!hrtimer) + return -ENOENT; + + item->hrtcycle = ktime_set(0, hrtimer * 1000000UL); + hrtimer_init(hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + hrt->function = ot_hrtimer_handler; + return 0; +} + +static int ot_init_cpu_item(struct ot_item *item, + struct ot_test *test, + struct objpool_head *pool, + void (*worker)(struct ot_item *, int)) +{ + memset(item, 0, sizeof(*item)); + item->pool = pool; + item->test = test; + item->worker = worker; + + item->bulk[0] = test->bulk_normal; + item->bulk[1] = test->bulk_irq; + item->delay = test->delay; + + /* initialize hrtimer */ + ot_init_hrtimer(item, item->test->hrtimer); + return 0; +} + +static int ot_thread_worker(void *arg) +{ + struct ot_item *item = arg; + struct ot_test *test = item->test; + ktime_t start; + + atomic_inc(&test->data.nthreads); + down_read(&test->data.start); + up_read(&test->data.start); + start = ktime_get(); + ot_start_hrtimer(item); + do { + if (atomic_read_acquire(&test->data.stop)) + break; + /* do bulk-testings for objects pop/push */ + item->worker(item, 0); + } while (!kthread_should_stop()); + ot_stop_hrtimer(item); + item->duration = (u64) ktime_us_delta(ktime_get(), start); + if (atomic_dec_and_test(&test->data.nthreads)) + complete(&test->data.wait); + + return 0; +} + +static void ot_perf_report(struct ot_test *test, u64 duration) +{ + struct ot_obj_stat total, normal = {0}, irq = {0}; + int cpu, nthreads = 0; + + pr_info("\n"); + pr_info("Testing summary for %s\n", test->name); + + for_each_possible_cpu(cpu) { + struct ot_item *item = per_cpu_ptr(&ot_pcup_items, cpu); + if (!item->duration) + continue; + normal.nhits += item->stat[0].nhits; + normal.nmiss += item->stat[0].nmiss; + irq.nhits += item->stat[1].nhits; + irq.nmiss += item->stat[1].nmiss; + pr_info("CPU: %d duration: %lluus\n", cpu, item->duration); + pr_info("\tthread:\t%16lu hits \t%16lu miss\n", + item->stat[0].nhits, item->stat[0].nmiss); + pr_info("\tirq: \t%16lu hits \t%16lu miss\n", + item->stat[1].nhits, item->stat[1].nmiss); + pr_info("\ttotal: \t%16lu hits \t%16lu miss\n", + item->stat[0].nhits + item->stat[1].nhits, + item->stat[0].nmiss + item->stat[1].nmiss); + nthreads++; + } + + total.nhits = normal.nhits + irq.nhits; + total.nmiss = normal.nmiss + irq.nmiss; + + pr_info("ALL: \tnthreads: %d duration: %lluus\n", nthreads, duration); + pr_info("SUM: \t%16lu hits \t%16lu miss\n", + total.nhits, total.nmiss); + + test->data.objects = total; + test->data.duration = duration; +} + +/* + * synchronous test cases for objpool manipulation + */ + +/* objpool manipulation for synchronous mode (percpu objpool) */ +static struct ot_context *ot_init_sync_m0(struct ot_test *test) +{ + struct ot_context *sop = NULL; + int max = num_possible_cpus() << 3; + gfp_t gfp = GFP_KERNEL; + + sop = (struct ot_context *)ot_kzalloc(test, sizeof(*sop)); + if (!sop) + return NULL; + sop->test = test; + if (test->objsz < 512) + gfp = GFP_ATOMIC; + + if (objpool_init(&sop->pool, max, test->objsz, + gfp, sop, ot_init_node, NULL)) { + ot_kfree(test, sop, sizeof(*sop)); + return NULL; + } + WARN_ON(max != sop->pool.nr_objs); + + return sop; +} + +static void ot_fini_sync(struct ot_context *sop) +{ + objpool_fini(&sop->pool); + ot_kfree(sop->test, sop, sizeof(*sop)); +} + +struct { + struct ot_context * (*init)(struct ot_test *oc); + void (*fini)(struct ot_context *sop); +} g_ot_sync_ops[] = { + {.init = ot_init_sync_m0, .fini = ot_fini_sync}, +}; + +/* + * synchronous test cases: performance mode + */ + +static void ot_bulk_sync(struct ot_item *item, int irq) +{ + struct ot_node *nods[OT_NR_MAX_BULK]; + int i; + + for (i = 0; i < item->bulk[irq]; i++) + nods[i] = objpool_pop(item->pool); + + if (!irq && (item->delay || !(++(item->niters) & 0x7FFF))) + msleep(item->delay); + + while (i-- > 0) { + struct ot_node *on = nods[i]; + if (on) { + on->refs++; + objpool_push(on, item->pool); + item->stat[irq].nhits++; + } else { + item->stat[irq].nmiss++; + } + } +} + +static int ot_start_sync(struct ot_test *test) +{ + struct ot_context *sop; + ktime_t start; + u64 duration; + unsigned long timeout; + int cpu; + + /* initialize objpool for syncrhonous testcase */ + sop = g_ot_sync_ops[test->mode].init(test); + if (!sop) + return -ENOMEM; + + /* grab rwsem to block testing threads */ + down_write(&test->data.start); + + for_each_possible_cpu(cpu) { + struct ot_item *item = per_cpu_ptr(&ot_pcup_items, cpu); + struct task_struct *work; + + ot_init_cpu_item(item, test, &sop->pool, ot_bulk_sync); + + /* skip offline cpus */ + if (!cpu_online(cpu)) + continue; + + work = kthread_create_on_node(ot_thread_worker, item, + cpu_to_node(cpu), "ot_worker_%d", cpu); + if (IS_ERR(work)) { + pr_err("failed to create thread for cpu %d\n", cpu); + } else { + kthread_bind(work, cpu); + wake_up_process(work); + } + } + + /* wait a while to make sure all threads waiting at start line */ + msleep(20); + + /* in case no threads were created: memory insufficient ? */ + if (atomic_dec_and_test(&test->data.nthreads)) + complete(&test->data.wait); + + // sched_set_fifo_low(current); + + /* start objpool testing threads */ + start = ktime_get(); + up_write(&test->data.start); + + /* yeild cpu to worker threads for duration ms */ + timeout = msecs_to_jiffies(test->duration); + schedule_timeout_interruptible(timeout); + + /* tell workers threads to quit */ + atomic_set_release(&test->data.stop, 1); + + /* wait all workers threads finish and quit */ + wait_for_completion(&test->data.wait); + duration = (u64) ktime_us_delta(ktime_get(), start); + + /* cleanup objpool */ + g_ot_sync_ops[test->mode].fini(sop); + + /* report testing summary and performance results */ + ot_perf_report(test, duration); + + /* report memory allocation summary */ + ot_mem_report(test); + + return 0; +} + +/* + * asynchronous test cases: pool lifecycle controlled by refcount + */ + +static void ot_fini_async_rcu(struct rcu_head *rcu) +{ + struct ot_context *sop = container_of(rcu, struct ot_context, rcu); + struct ot_test *test = sop->test; + + /* here all cpus are aware of the stop event: test->data.stop = 1 */ + WARN_ON(!atomic_read_acquire(&test->data.stop)); + + objpool_fini(&sop->pool); + complete(&test->data.rcu); +} + +static void ot_fini_async(struct ot_context *sop) +{ + /* make sure the stop event is acknowledged by all cores */ + call_rcu(&sop->rcu, ot_fini_async_rcu); +} + +static int ot_objpool_release(struct objpool_head *head, void *context) +{ + struct ot_context *sop = context; + + WARN_ON(!head || !sop || head != &sop->pool); + + /* do context cleaning if needed */ + if (sop) + ot_kfree(sop->test, sop, sizeof(*sop)); + + return 0; +} + +static struct ot_context *ot_init_async_m0(struct ot_test *test) +{ + struct ot_context *sop = NULL; + int max = num_possible_cpus() << 3; + gfp_t gfp = GFP_KERNEL; + + sop = (struct ot_context *)ot_kzalloc(test, sizeof(*sop)); + if (!sop) + return NULL; + sop->test = test; + if (test->objsz < 512) + gfp = GFP_ATOMIC; + + if (objpool_init(&sop->pool, max, test->objsz, gfp, sop, + ot_init_node, ot_objpool_release)) { + ot_kfree(test, sop, sizeof(*sop)); + return NULL; + } + WARN_ON(max != sop->pool.nr_objs); + + return sop; +} + +struct { + struct ot_context * (*init)(struct ot_test *oc); + void (*fini)(struct ot_context *sop); +} g_ot_async_ops[] = { + {.init = ot_init_async_m0, .fini = ot_fini_async}, +}; + +static void ot_nod_recycle(struct ot_node *on, struct objpool_head *pool, + int release) +{ + struct ot_context *sop; + + on->refs++; + + if (!release) { + /* push object back to opjpool for reuse */ + objpool_push(on, pool); + return; + } + + sop = container_of(pool, struct ot_context, pool); + WARN_ON(sop != pool->context); + + /* unref objpool with nod removed forever */ + objpool_drop(on, pool); +} + +static void ot_bulk_async(struct ot_item *item, int irq) +{ + struct ot_test *test = item->test; + struct ot_node *nods[OT_NR_MAX_BULK]; + int i, stop; + + for (i = 0; i < item->bulk[irq]; i++) + nods[i] = objpool_pop(item->pool); + + if (!irq) { + if (item->delay || !(++(item->niters) & 0x7FFF)) + msleep(item->delay); + get_cpu(); + } + + stop = atomic_read_acquire(&test->data.stop); + + /* drop all objects and deref objpool */ + while (i-- > 0) { + struct ot_node *on = nods[i]; + + if (on) { + on->refs++; + ot_nod_recycle(on, item->pool, stop); + item->stat[irq].nhits++; + } else { + item->stat[irq].nmiss++; + } + } + + if (!irq) + put_cpu(); +} + +static int ot_start_async(struct ot_test *test) +{ + struct ot_context *sop; + ktime_t start; + u64 duration; + unsigned long timeout; + int cpu; + + /* initialize objpool for syncrhonous testcase */ + sop = g_ot_async_ops[test->mode].init(test); + if (!sop) + return -ENOMEM; + + /* grab rwsem to block testing threads */ + down_write(&test->data.start); + + for_each_possible_cpu(cpu) { + struct ot_item *item = per_cpu_ptr(&ot_pcup_items, cpu); + struct task_struct *work; + + ot_init_cpu_item(item, test, &sop->pool, ot_bulk_async); + + /* skip offline cpus */ + if (!cpu_online(cpu)) + continue; + + work = kthread_create_on_node(ot_thread_worker, item, + cpu_to_node(cpu), "ot_worker_%d", cpu); + if (IS_ERR(work)) { + pr_err("failed to create thread for cpu %d\n", cpu); + } else { + kthread_bind(work, cpu); + wake_up_process(work); + } + } + + /* wait a while to make sure all threads waiting at start line */ + msleep(20); + + /* in case no threads were created: memory insufficient ? */ + if (atomic_dec_and_test(&test->data.nthreads)) + complete(&test->data.wait); + + /* start objpool testing threads */ + start = ktime_get(); + up_write(&test->data.start); + + /* yeild cpu to worker threads for duration ms */ + timeout = msecs_to_jiffies(test->duration); + schedule_timeout_interruptible(timeout); + + /* tell workers threads to quit */ + atomic_set_release(&test->data.stop, 1); + + /* do async-finalization */ + g_ot_async_ops[test->mode].fini(sop); + + /* wait all workers threads finish and quit */ + wait_for_completion(&test->data.wait); + duration = (u64) ktime_us_delta(ktime_get(), start); + + /* assure rcu callback is triggered */ + wait_for_completion(&test->data.rcu); + + /* + * now we are sure that objpool is finalized either + * by rcu callback or by worker threads + */ + + /* report testing summary and performance results */ + ot_perf_report(test, duration); + + /* report memory allocation summary */ + ot_mem_report(test); + + return 0; +} + +/* + * predefined testing cases: + * synchronous case / overrun case / async case + * + * async: synchronous or asynchronous testing + * mode: only mode 0 supported + * objsz: object size + * duration: int, total test time in ms + * delay: int, delay (in ms) between each iteration + * bulk_normal: int, repeat times for thread worker + * bulk_irq: int, repeat times for irq consumer + * hrtimer: unsigned long, hrtimer intervnal in ms + * name: char *, tag for current test ot_item + */ + +#define NODE_COMPACT sizeof(struct ot_node) +#define NODE_VMALLOC (512) + +struct ot_test g_testcases[] = { + + /* sync & normal */ + {0, 0, NODE_COMPACT, 1000, 0, 1, 0, 0, "sync: percpu objpool"}, + {0, 0, NODE_VMALLOC, 1000, 0, 1, 0, 0, "sync: percpu objpool from vmalloc"}, + + /* sync & hrtimer */ + {0, 0, NODE_COMPACT, 1000, 0, 1, 1, 4, "sync & hrtimer: percpu objpool"}, + {0, 0, NODE_VMALLOC, 1000, 0, 1, 1, 4, "sync & hrtimer: percpu objpool from vmalloc"}, + + /* sync & overrun */ + {0, 0, NODE_COMPACT, 1000, 0, 16, 0, 0, "sync overrun: percpu objpool"}, + {0, 0, NODE_VMALLOC, 1000, 0, 16, 0, 0, "sync overrun: percpu objpool from vmalloc"}, + + /* async mode */ + {1, 0, NODE_COMPACT, 1000, 100, 1, 0, 0, "async: percpu objpool"}, + {1, 0, NODE_VMALLOC, 1000, 100, 1, 0, 0, "async: percpu objpool from vmalloc"}, + + /* async + hrtimer mode */ + {1, 0, NODE_COMPACT, 1000, 0, 4, 4, 4, "async & hrtimer: percpu objpool"}, + {1, 0, NODE_VMALLOC, 1000, 0, 4, 4, 4, "async & hrtimer: percpu objpool from vmalloc"}, +}; + +static int __init ot_mod_init(void) +{ + int i; + + /* perform testings */ + for (i = 0; i < ARRAY_SIZE(g_testcases); i++) { + ot_init_data(&g_testcases[i].data); + if (g_testcases[i].async) + ot_start_async(&g_testcases[i]); + else + ot_start_sync(&g_testcases[i]); + } + + /* show tests summary */ + pr_info("\n"); + pr_info("Summary of testcases:\n"); + for (i = 0; i < ARRAY_SIZE(g_testcases); i++) { + pr_info(" duration: %lluus \thits: %10lu \tmiss: %10lu \t%s\n", + g_testcases[i].data.duration, g_testcases[i].data.objects.nhits, + g_testcases[i].data.objects.nmiss, g_testcases[i].name); + } + + return -EAGAIN; +} + +static void __exit ot_mod_exit(void) +{ +} + +module_init(ot_mod_init); +module_exit(ot_mod_exit); + +MODULE_LICENSE("GPL");
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