source: mainline/kernel/test/mm/slab2.c@ e422ff6

/*
 * Copyright (c) 2006 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <test.h>
#include <mm/slab.h>
#include <proc/thread.h>
#include <arch.h>
#include <mm/frame.h>
#include <mem.h>
#include <synch/condvar.h>
#include <synch/mutex.h>

#define ITEM_SIZE  256

/** Fill memory with 2 caches, when allocation fails,
 *  free one of the caches. We should have everything in magazines,
 *  now allocation should clean magazines and allow for full allocation.
 */
static void totalmemtest(void)
{
        slab_cache_t *cache1;
        slab_cache_t *cache2;
        int i;

        void *data1, *data2;
        void *olddata1 = NULL, *olddata2 = NULL;

        cache1 = slab_cache_create("test_cache1", ITEM_SIZE, 0, NULL, NULL, 0);
        cache2 = slab_cache_create("test_cache2", ITEM_SIZE, 0, NULL, NULL, 0);

        TPRINTF("Allocating...");

        /* Use atomic alloc, so that we find end of memory */
        do {
                data1 = slab_alloc(cache1, FRAME_ATOMIC);
                data2 = slab_alloc(cache2, FRAME_ATOMIC);
                if ((!data1) || (!data2)) {
                        if (data1)
                                slab_free(cache1, data1);
                        if (data2)
                                slab_free(cache2, data2);
                        break;
                }
                memsetb(data1, ITEM_SIZE, 0);
                memsetb(data2, ITEM_SIZE, 0);
                *((void **) data1) = olddata1;
                *((void **) data2) = olddata2;
                olddata1 = data1;
                olddata2 = data2;
        } while (true);

        TPRINTF("done.\n");

        TPRINTF("Deallocating cache2...");

        /* We do not have memory - now deallocate cache2 */
        while (olddata2) {
                data2 = *((void **) olddata2);
                slab_free(cache2, olddata2);
                olddata2 = data2;
        }

        TPRINTF("done.\n");

        TPRINTF("Allocating to cache1...\n");

        for (i = 0; i < 30; i++) {
                data1 = slab_alloc(cache1, FRAME_ATOMIC);
                if (!data1) {
                        TPRINTF("Incorrect memory size - use another test.");
                        return;
                }
                memsetb(data1, ITEM_SIZE, 0);
                *((void **) data1) = olddata1;
                olddata1 = data1;
        }
        while (true) {
                data1 = slab_alloc(cache1, FRAME_ATOMIC);
                if (!data1)
                        break;
                memsetb(data1, ITEM_SIZE, 0);
                *((void **) data1) = olddata1;
                olddata1 = data1;
        }

        TPRINTF("Deallocating cache1...");

        while (olddata1) {
                data1 = *((void **) olddata1);
                slab_free(cache1, olddata1);
                olddata1 = data1;
        }

        TPRINTF("done.\n");

        if (!test_quiet)
                slab_print_list();

        slab_cache_destroy(cache1);
        slab_cache_destroy(cache2);
}

static slab_cache_t *thr_cache;
static semaphore_t thr_sem;
static condvar_t thread_starter;
static mutex_t starter_mutex;

#define THREADS  8

static void slabtest(void *priv)
{
        void *data = NULL, *new;

        thread_detach(THREAD);

        mutex_lock(&starter_mutex);
        condvar_wait(&thread_starter, &starter_mutex);
        mutex_unlock(&starter_mutex);

        TPRINTF("Starting thread #%" PRIu64 "...\n", THREAD->tid);

        /* Alloc all */
        TPRINTF("Thread #%" PRIu64 " allocating...\n", THREAD->tid);

        while (true) {
                /* Call with atomic to detect end of memory */
                new = slab_alloc(thr_cache, FRAME_ATOMIC);
                if (!new)
                        break;
                *((void **) new) = data;
                data = new;
        }

        TPRINTF("Thread #%" PRIu64 " releasing...\n", THREAD->tid);

        while (data) {
                new = *((void **)data);
                *((void **) data) = NULL;
                slab_free(thr_cache, data);
                data = new;
        }

        TPRINTF("Thread #%" PRIu64 " allocating...\n", THREAD->tid);

        while (true) {
                /* Call with atomic to detect end of memory */
                new = slab_alloc(thr_cache, FRAME_ATOMIC);
                if (!new)
                        break;
                *((void **) new) = data;
                data = new;
        }

        TPRINTF("Thread #%" PRIu64 " releasing...\n", THREAD->tid);

        while (data) {
                new = *((void **)data);
                *((void **) data) = NULL;
                slab_free(thr_cache, data);
                data = new;
        }

        TPRINTF("Thread #%" PRIu64 " finished\n", THREAD->tid);

        if (!test_quiet)
                slab_print_list();

        semaphore_up(&thr_sem);
}

static void multitest(int size)
{
        /*
         * Start 8 threads that just allocate as much as possible,
         * then release everything, then again allocate, then release
         */
        thread_t *t;
        int i;

        TPRINTF("Running stress test with size %d\n", size);

        condvar_initialize(&thread_starter);
        mutex_initialize(&starter_mutex, MUTEX_PASSIVE);

        thr_cache = slab_cache_create("thread_cache", size, 0, NULL, NULL, 0);
        semaphore_initialize(&thr_sem, 0);
        for (i = 0; i < THREADS; i++) {
                if (!(t = thread_create(slabtest, NULL, TASK, THREAD_FLAG_NONE, "slabtest"))) {
                        TPRINTF("Could not create thread %d\n", i);
                } else
                        thread_ready(t);
        }
        thread_sleep(1);
        condvar_broadcast(&thread_starter);

        for (i = 0; i < THREADS; i++)
                semaphore_down(&thr_sem);

        slab_cache_destroy(thr_cache);
        TPRINTF("Stress test complete.\n");
}

const char *test_slab2(void)
{
        TPRINTF("Running reclaim single-thread test .. pass 1\n");
        totalmemtest();

        TPRINTF("Running reclaim single-thread test .. pass 2\n");
        totalmemtest();

        TPRINTF("Reclaim test OK.\n");

        multitest(128);
        multitest(2048);
        multitest(8192);

        return NULL;
}