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Kernel test robot reported build warnings that structures g_ot_sync_ops, g_ot_async_ops and g_testcases should be static. These definitions are only used in test_objpool.c, so make them static Link: https://lore.kernel.org/all/20231108012248.313574-1-wuqiang.matt@bytedance.com/ Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202311071229.WGrWUjM1-lkp@intel.com/ Signed-off-by: wuqiang.matt <wuqiang.matt@bytedance.com> Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
690 lines
16 KiB
C
690 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Test module for lockless object pool
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*
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* Copyright: wuqiang.matt@bytedance.com
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/completion.h>
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#include <linux/kthread.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/delay.h>
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#include <linux/hrtimer.h>
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#include <linux/objpool.h>
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#define OT_NR_MAX_BULK (16)
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/* memory usage */
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struct ot_mem_stat {
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atomic_long_t alloc;
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atomic_long_t free;
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};
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/* object allocation results */
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struct ot_obj_stat {
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unsigned long nhits;
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unsigned long nmiss;
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};
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/* control & results per testcase */
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struct ot_data {
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struct rw_semaphore start;
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struct completion wait;
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struct completion rcu;
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atomic_t nthreads ____cacheline_aligned_in_smp;
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atomic_t stop ____cacheline_aligned_in_smp;
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struct ot_mem_stat kmalloc;
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struct ot_mem_stat vmalloc;
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struct ot_obj_stat objects;
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u64 duration;
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};
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/* testcase */
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struct ot_test {
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int async; /* synchronous or asynchronous */
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int mode; /* only mode 0 supported */
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int objsz; /* object size */
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int duration; /* ms */
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int delay; /* ms */
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int bulk_normal;
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int bulk_irq;
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unsigned long hrtimer; /* ms */
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const char *name;
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struct ot_data data;
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};
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/* per-cpu worker */
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struct ot_item {
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struct objpool_head *pool; /* pool head */
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struct ot_test *test; /* test parameters */
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void (*worker)(struct ot_item *item, int irq);
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/* hrtimer control */
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ktime_t hrtcycle;
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struct hrtimer hrtimer;
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int bulk[2]; /* for thread and irq */
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int delay;
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u32 niters;
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/* summary per thread */
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struct ot_obj_stat stat[2]; /* thread and irq */
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u64 duration;
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};
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/*
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* memory leakage checking
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*/
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static void *ot_kzalloc(struct ot_test *test, long size)
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{
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void *ptr = kzalloc(size, GFP_KERNEL);
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if (ptr)
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atomic_long_add(size, &test->data.kmalloc.alloc);
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return ptr;
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}
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static void ot_kfree(struct ot_test *test, void *ptr, long size)
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{
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if (!ptr)
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return;
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atomic_long_add(size, &test->data.kmalloc.free);
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kfree(ptr);
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}
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static void ot_mem_report(struct ot_test *test)
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{
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long alloc, free;
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pr_info("memory allocation summary for %s\n", test->name);
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alloc = atomic_long_read(&test->data.kmalloc.alloc);
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free = atomic_long_read(&test->data.kmalloc.free);
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pr_info(" kmalloc: %lu - %lu = %lu\n", alloc, free, alloc - free);
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alloc = atomic_long_read(&test->data.vmalloc.alloc);
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free = atomic_long_read(&test->data.vmalloc.free);
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pr_info(" vmalloc: %lu - %lu = %lu\n", alloc, free, alloc - free);
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}
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/* user object instance */
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struct ot_node {
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void *owner;
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unsigned long data;
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unsigned long refs;
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unsigned long payload[32];
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};
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/* user objpool manager */
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struct ot_context {
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struct objpool_head pool; /* objpool head */
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struct ot_test *test; /* test parameters */
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void *ptr; /* user pool buffer */
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unsigned long size; /* buffer size */
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struct rcu_head rcu;
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};
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static DEFINE_PER_CPU(struct ot_item, ot_pcup_items);
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static int ot_init_data(struct ot_data *data)
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{
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memset(data, 0, sizeof(*data));
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init_rwsem(&data->start);
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init_completion(&data->wait);
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init_completion(&data->rcu);
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atomic_set(&data->nthreads, 1);
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return 0;
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}
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static int ot_init_node(void *nod, void *context)
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{
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struct ot_context *sop = context;
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struct ot_node *on = nod;
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on->owner = &sop->pool;
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return 0;
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}
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static enum hrtimer_restart ot_hrtimer_handler(struct hrtimer *hrt)
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{
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struct ot_item *item = container_of(hrt, struct ot_item, hrtimer);
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struct ot_test *test = item->test;
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if (atomic_read_acquire(&test->data.stop))
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return HRTIMER_NORESTART;
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/* do bulk-testings for objects pop/push */
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item->worker(item, 1);
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hrtimer_forward(hrt, hrt->base->get_time(), item->hrtcycle);
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return HRTIMER_RESTART;
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}
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static void ot_start_hrtimer(struct ot_item *item)
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{
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if (!item->test->hrtimer)
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return;
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hrtimer_start(&item->hrtimer, item->hrtcycle, HRTIMER_MODE_REL);
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}
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static void ot_stop_hrtimer(struct ot_item *item)
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{
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if (!item->test->hrtimer)
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return;
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hrtimer_cancel(&item->hrtimer);
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}
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static int ot_init_hrtimer(struct ot_item *item, unsigned long hrtimer)
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{
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struct hrtimer *hrt = &item->hrtimer;
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if (!hrtimer)
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return -ENOENT;
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item->hrtcycle = ktime_set(0, hrtimer * 1000000UL);
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hrtimer_init(hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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hrt->function = ot_hrtimer_handler;
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return 0;
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}
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static int ot_init_cpu_item(struct ot_item *item,
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struct ot_test *test,
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struct objpool_head *pool,
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void (*worker)(struct ot_item *, int))
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{
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memset(item, 0, sizeof(*item));
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item->pool = pool;
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item->test = test;
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item->worker = worker;
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item->bulk[0] = test->bulk_normal;
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item->bulk[1] = test->bulk_irq;
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item->delay = test->delay;
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/* initialize hrtimer */
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ot_init_hrtimer(item, item->test->hrtimer);
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return 0;
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}
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static int ot_thread_worker(void *arg)
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{
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struct ot_item *item = arg;
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struct ot_test *test = item->test;
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ktime_t start;
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atomic_inc(&test->data.nthreads);
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down_read(&test->data.start);
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up_read(&test->data.start);
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start = ktime_get();
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ot_start_hrtimer(item);
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do {
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if (atomic_read_acquire(&test->data.stop))
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break;
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/* do bulk-testings for objects pop/push */
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item->worker(item, 0);
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} while (!kthread_should_stop());
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ot_stop_hrtimer(item);
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item->duration = (u64) ktime_us_delta(ktime_get(), start);
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if (atomic_dec_and_test(&test->data.nthreads))
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complete(&test->data.wait);
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return 0;
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}
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static void ot_perf_report(struct ot_test *test, u64 duration)
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{
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struct ot_obj_stat total, normal = {0}, irq = {0};
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int cpu, nthreads = 0;
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pr_info("\n");
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pr_info("Testing summary for %s\n", test->name);
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for_each_possible_cpu(cpu) {
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struct ot_item *item = per_cpu_ptr(&ot_pcup_items, cpu);
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if (!item->duration)
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continue;
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normal.nhits += item->stat[0].nhits;
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normal.nmiss += item->stat[0].nmiss;
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irq.nhits += item->stat[1].nhits;
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irq.nmiss += item->stat[1].nmiss;
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pr_info("CPU: %d duration: %lluus\n", cpu, item->duration);
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pr_info("\tthread:\t%16lu hits \t%16lu miss\n",
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item->stat[0].nhits, item->stat[0].nmiss);
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pr_info("\tirq: \t%16lu hits \t%16lu miss\n",
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item->stat[1].nhits, item->stat[1].nmiss);
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pr_info("\ttotal: \t%16lu hits \t%16lu miss\n",
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item->stat[0].nhits + item->stat[1].nhits,
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item->stat[0].nmiss + item->stat[1].nmiss);
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nthreads++;
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}
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total.nhits = normal.nhits + irq.nhits;
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total.nmiss = normal.nmiss + irq.nmiss;
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pr_info("ALL: \tnthreads: %d duration: %lluus\n", nthreads, duration);
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pr_info("SUM: \t%16lu hits \t%16lu miss\n",
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total.nhits, total.nmiss);
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test->data.objects = total;
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test->data.duration = duration;
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}
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/*
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* synchronous test cases for objpool manipulation
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*/
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/* objpool manipulation for synchronous mode (percpu objpool) */
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static struct ot_context *ot_init_sync_m0(struct ot_test *test)
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{
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struct ot_context *sop = NULL;
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int max = num_possible_cpus() << 3;
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gfp_t gfp = GFP_KERNEL;
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sop = (struct ot_context *)ot_kzalloc(test, sizeof(*sop));
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if (!sop)
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return NULL;
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sop->test = test;
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if (test->objsz < 512)
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gfp = GFP_ATOMIC;
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if (objpool_init(&sop->pool, max, test->objsz,
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gfp, sop, ot_init_node, NULL)) {
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ot_kfree(test, sop, sizeof(*sop));
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return NULL;
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}
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WARN_ON(max != sop->pool.nr_objs);
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return sop;
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}
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static void ot_fini_sync(struct ot_context *sop)
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{
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objpool_fini(&sop->pool);
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ot_kfree(sop->test, sop, sizeof(*sop));
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}
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static struct {
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struct ot_context * (*init)(struct ot_test *oc);
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void (*fini)(struct ot_context *sop);
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} g_ot_sync_ops[] = {
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{.init = ot_init_sync_m0, .fini = ot_fini_sync},
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};
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/*
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* synchronous test cases: performance mode
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*/
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static void ot_bulk_sync(struct ot_item *item, int irq)
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{
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struct ot_node *nods[OT_NR_MAX_BULK];
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int i;
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for (i = 0; i < item->bulk[irq]; i++)
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nods[i] = objpool_pop(item->pool);
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if (!irq && (item->delay || !(++(item->niters) & 0x7FFF)))
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msleep(item->delay);
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while (i-- > 0) {
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struct ot_node *on = nods[i];
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if (on) {
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on->refs++;
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objpool_push(on, item->pool);
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item->stat[irq].nhits++;
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} else {
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item->stat[irq].nmiss++;
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}
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}
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}
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static int ot_start_sync(struct ot_test *test)
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{
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struct ot_context *sop;
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ktime_t start;
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u64 duration;
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unsigned long timeout;
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int cpu;
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/* initialize objpool for syncrhonous testcase */
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sop = g_ot_sync_ops[test->mode].init(test);
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if (!sop)
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return -ENOMEM;
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/* grab rwsem to block testing threads */
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down_write(&test->data.start);
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for_each_possible_cpu(cpu) {
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struct ot_item *item = per_cpu_ptr(&ot_pcup_items, cpu);
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struct task_struct *work;
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ot_init_cpu_item(item, test, &sop->pool, ot_bulk_sync);
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/* skip offline cpus */
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if (!cpu_online(cpu))
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continue;
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work = kthread_create_on_node(ot_thread_worker, item,
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cpu_to_node(cpu), "ot_worker_%d", cpu);
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if (IS_ERR(work)) {
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pr_err("failed to create thread for cpu %d\n", cpu);
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} else {
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kthread_bind(work, cpu);
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wake_up_process(work);
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}
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}
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/* wait a while to make sure all threads waiting at start line */
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msleep(20);
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/* in case no threads were created: memory insufficient ? */
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if (atomic_dec_and_test(&test->data.nthreads))
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complete(&test->data.wait);
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// sched_set_fifo_low(current);
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/* start objpool testing threads */
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start = ktime_get();
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up_write(&test->data.start);
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/* yeild cpu to worker threads for duration ms */
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timeout = msecs_to_jiffies(test->duration);
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schedule_timeout_interruptible(timeout);
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/* tell workers threads to quit */
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atomic_set_release(&test->data.stop, 1);
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/* wait all workers threads finish and quit */
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wait_for_completion(&test->data.wait);
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duration = (u64) ktime_us_delta(ktime_get(), start);
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/* cleanup objpool */
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g_ot_sync_ops[test->mode].fini(sop);
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/* report testing summary and performance results */
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ot_perf_report(test, duration);
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/* report memory allocation summary */
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ot_mem_report(test);
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return 0;
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}
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/*
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* asynchronous test cases: pool lifecycle controlled by refcount
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*/
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static void ot_fini_async_rcu(struct rcu_head *rcu)
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{
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struct ot_context *sop = container_of(rcu, struct ot_context, rcu);
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struct ot_test *test = sop->test;
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/* here all cpus are aware of the stop event: test->data.stop = 1 */
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WARN_ON(!atomic_read_acquire(&test->data.stop));
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objpool_fini(&sop->pool);
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complete(&test->data.rcu);
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}
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static void ot_fini_async(struct ot_context *sop)
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{
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/* make sure the stop event is acknowledged by all cores */
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call_rcu(&sop->rcu, ot_fini_async_rcu);
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}
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static int ot_objpool_release(struct objpool_head *head, void *context)
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{
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struct ot_context *sop = context;
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WARN_ON(!head || !sop || head != &sop->pool);
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/* do context cleaning if needed */
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if (sop)
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ot_kfree(sop->test, sop, sizeof(*sop));
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return 0;
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}
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static struct ot_context *ot_init_async_m0(struct ot_test *test)
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{
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struct ot_context *sop = NULL;
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int max = num_possible_cpus() << 3;
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gfp_t gfp = GFP_KERNEL;
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sop = (struct ot_context *)ot_kzalloc(test, sizeof(*sop));
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if (!sop)
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return NULL;
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sop->test = test;
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if (test->objsz < 512)
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gfp = GFP_ATOMIC;
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if (objpool_init(&sop->pool, max, test->objsz, gfp, sop,
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ot_init_node, ot_objpool_release)) {
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ot_kfree(test, sop, sizeof(*sop));
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return NULL;
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}
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WARN_ON(max != sop->pool.nr_objs);
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return sop;
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}
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static struct {
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struct ot_context * (*init)(struct ot_test *oc);
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void (*fini)(struct ot_context *sop);
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} g_ot_async_ops[] = {
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{.init = ot_init_async_m0, .fini = ot_fini_async},
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};
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static void ot_nod_recycle(struct ot_node *on, struct objpool_head *pool,
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int release)
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{
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struct ot_context *sop;
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on->refs++;
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if (!release) {
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/* push object back to opjpool for reuse */
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objpool_push(on, pool);
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return;
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}
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sop = container_of(pool, struct ot_context, pool);
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WARN_ON(sop != pool->context);
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/* unref objpool with nod removed forever */
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objpool_drop(on, pool);
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}
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static void ot_bulk_async(struct ot_item *item, int irq)
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{
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struct ot_test *test = item->test;
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struct ot_node *nods[OT_NR_MAX_BULK];
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int i, stop;
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for (i = 0; i < item->bulk[irq]; i++)
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nods[i] = objpool_pop(item->pool);
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if (!irq) {
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if (item->delay || !(++(item->niters) & 0x7FFF))
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msleep(item->delay);
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get_cpu();
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}
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stop = atomic_read_acquire(&test->data.stop);
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/* drop all objects and deref objpool */
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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)
|
|
|
|
static 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"); |