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![NeilBrown](/assets/img/avatar_default.png)
Rather than dereferencing a pointer to a bucket and then passing the result to rht_ptr(), we now pass in the pointer and do the dereference in rht_ptr(). This requires that we pass in the tbl and hash as well to support RCU checks, and means that the various rht_for_each functions can expect a pointer that can be dereferenced without further care. There are two places where we dereference a bucket pointer where there is no testable protection - in each case we know that we much have exclusive access without having taken a lock. The previous code used rht_dereference() to pretend that holding the mutex provided protects, but holding the mutex never provides protection for accessing buckets. So instead introduce rht_ptr_exclusive() that can be used when there is known to be exclusive access without holding any locks. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: David S. Miller <davem@davemloft.net>
831 lines
20 KiB
C
831 lines
20 KiB
C
/*
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* Resizable, Scalable, Concurrent Hash Table
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*
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* Copyright (c) 2014-2015 Thomas Graf <tgraf@suug.ch>
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* Copyright (c) 2008-2014 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/**************************************************************************
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* Self Test
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**************************************************************************/
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#include <linux/init.h>
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#include <linux/jhash.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/module.h>
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#include <linux/rcupdate.h>
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#include <linux/rhashtable.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/random.h>
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#include <linux/vmalloc.h>
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#include <linux/wait.h>
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#define MAX_ENTRIES 1000000
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#define TEST_INSERT_FAIL INT_MAX
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static int parm_entries = 50000;
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module_param(parm_entries, int, 0);
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MODULE_PARM_DESC(parm_entries, "Number of entries to add (default: 50000)");
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static int runs = 4;
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module_param(runs, int, 0);
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MODULE_PARM_DESC(runs, "Number of test runs per variant (default: 4)");
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static int max_size = 0;
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module_param(max_size, int, 0);
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MODULE_PARM_DESC(max_size, "Maximum table size (default: calculated)");
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static bool shrinking = false;
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module_param(shrinking, bool, 0);
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MODULE_PARM_DESC(shrinking, "Enable automatic shrinking (default: off)");
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static int size = 8;
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module_param(size, int, 0);
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MODULE_PARM_DESC(size, "Initial size hint of table (default: 8)");
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static int tcount = 10;
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module_param(tcount, int, 0);
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MODULE_PARM_DESC(tcount, "Number of threads to spawn (default: 10)");
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static bool enomem_retry = false;
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module_param(enomem_retry, bool, 0);
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MODULE_PARM_DESC(enomem_retry, "Retry insert even if -ENOMEM was returned (default: off)");
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struct test_obj_val {
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int id;
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int tid;
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};
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struct test_obj {
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struct test_obj_val value;
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struct rhash_head node;
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};
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struct test_obj_rhl {
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struct test_obj_val value;
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struct rhlist_head list_node;
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};
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struct thread_data {
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unsigned int entries;
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int id;
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struct task_struct *task;
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struct test_obj *objs;
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};
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static u32 my_hashfn(const void *data, u32 len, u32 seed)
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{
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const struct test_obj_rhl *obj = data;
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return (obj->value.id % 10);
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}
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static int my_cmpfn(struct rhashtable_compare_arg *arg, const void *obj)
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{
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const struct test_obj_rhl *test_obj = obj;
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const struct test_obj_val *val = arg->key;
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return test_obj->value.id - val->id;
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}
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static struct rhashtable_params test_rht_params = {
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.head_offset = offsetof(struct test_obj, node),
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.key_offset = offsetof(struct test_obj, value),
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.key_len = sizeof(struct test_obj_val),
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.hashfn = jhash,
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};
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static struct rhashtable_params test_rht_params_dup = {
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.head_offset = offsetof(struct test_obj_rhl, list_node),
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.key_offset = offsetof(struct test_obj_rhl, value),
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.key_len = sizeof(struct test_obj_val),
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.hashfn = jhash,
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.obj_hashfn = my_hashfn,
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.obj_cmpfn = my_cmpfn,
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.nelem_hint = 128,
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.automatic_shrinking = false,
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};
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static atomic_t startup_count;
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static DECLARE_WAIT_QUEUE_HEAD(startup_wait);
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static int insert_retry(struct rhashtable *ht, struct test_obj *obj,
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const struct rhashtable_params params)
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{
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int err, retries = -1, enomem_retries = 0;
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do {
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retries++;
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cond_resched();
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err = rhashtable_insert_fast(ht, &obj->node, params);
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if (err == -ENOMEM && enomem_retry) {
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enomem_retries++;
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err = -EBUSY;
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}
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} while (err == -EBUSY);
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if (enomem_retries)
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pr_info(" %u insertions retried after -ENOMEM\n",
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enomem_retries);
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return err ? : retries;
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}
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static int __init test_rht_lookup(struct rhashtable *ht, struct test_obj *array,
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unsigned int entries)
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{
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unsigned int i;
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for (i = 0; i < entries; i++) {
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struct test_obj *obj;
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bool expected = !(i % 2);
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struct test_obj_val key = {
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.id = i,
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};
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if (array[i / 2].value.id == TEST_INSERT_FAIL)
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expected = false;
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obj = rhashtable_lookup_fast(ht, &key, test_rht_params);
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if (expected && !obj) {
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pr_warn("Test failed: Could not find key %u\n", key.id);
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return -ENOENT;
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} else if (!expected && obj) {
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pr_warn("Test failed: Unexpected entry found for key %u\n",
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key.id);
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return -EEXIST;
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} else if (expected && obj) {
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if (obj->value.id != i) {
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pr_warn("Test failed: Lookup value mismatch %u!=%u\n",
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obj->value.id, i);
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return -EINVAL;
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}
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}
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cond_resched_rcu();
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}
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return 0;
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}
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static void test_bucket_stats(struct rhashtable *ht, unsigned int entries)
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{
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unsigned int total = 0, chain_len = 0;
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struct rhashtable_iter hti;
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struct rhash_head *pos;
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rhashtable_walk_enter(ht, &hti);
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rhashtable_walk_start(&hti);
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while ((pos = rhashtable_walk_next(&hti))) {
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if (PTR_ERR(pos) == -EAGAIN) {
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pr_info("Info: encountered resize\n");
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chain_len++;
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continue;
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} else if (IS_ERR(pos)) {
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pr_warn("Test failed: rhashtable_walk_next() error: %ld\n",
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PTR_ERR(pos));
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break;
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}
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total++;
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}
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rhashtable_walk_stop(&hti);
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rhashtable_walk_exit(&hti);
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pr_info(" Traversal complete: counted=%u, nelems=%u, entries=%d, table-jumps=%u\n",
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total, atomic_read(&ht->nelems), entries, chain_len);
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if (total != atomic_read(&ht->nelems) || total != entries)
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pr_warn("Test failed: Total count mismatch ^^^");
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}
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static s64 __init test_rhashtable(struct rhashtable *ht, struct test_obj *array,
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unsigned int entries)
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{
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struct test_obj *obj;
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int err;
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unsigned int i, insert_retries = 0;
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s64 start, end;
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/*
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* Insertion Test:
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* Insert entries into table with all keys even numbers
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*/
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pr_info(" Adding %d keys\n", entries);
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start = ktime_get_ns();
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for (i = 0; i < entries; i++) {
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struct test_obj *obj = &array[i];
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obj->value.id = i * 2;
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err = insert_retry(ht, obj, test_rht_params);
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if (err > 0)
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insert_retries += err;
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else if (err)
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return err;
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}
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if (insert_retries)
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pr_info(" %u insertions retried due to memory pressure\n",
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insert_retries);
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test_bucket_stats(ht, entries);
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rcu_read_lock();
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test_rht_lookup(ht, array, entries);
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rcu_read_unlock();
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test_bucket_stats(ht, entries);
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pr_info(" Deleting %d keys\n", entries);
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for (i = 0; i < entries; i++) {
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struct test_obj_val key = {
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.id = i * 2,
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};
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if (array[i].value.id != TEST_INSERT_FAIL) {
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obj = rhashtable_lookup_fast(ht, &key, test_rht_params);
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BUG_ON(!obj);
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rhashtable_remove_fast(ht, &obj->node, test_rht_params);
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}
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cond_resched();
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}
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end = ktime_get_ns();
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pr_info(" Duration of test: %lld ns\n", end - start);
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return end - start;
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}
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static struct rhashtable ht;
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static struct rhltable rhlt;
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static int __init test_rhltable(unsigned int entries)
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{
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struct test_obj_rhl *rhl_test_objects;
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unsigned long *obj_in_table;
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unsigned int i, j, k;
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int ret, err;
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if (entries == 0)
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entries = 1;
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rhl_test_objects = vzalloc(array_size(entries,
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sizeof(*rhl_test_objects)));
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if (!rhl_test_objects)
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return -ENOMEM;
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ret = -ENOMEM;
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obj_in_table = vzalloc(array_size(sizeof(unsigned long),
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BITS_TO_LONGS(entries)));
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if (!obj_in_table)
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goto out_free;
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err = rhltable_init(&rhlt, &test_rht_params);
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if (WARN_ON(err))
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goto out_free;
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k = prandom_u32();
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ret = 0;
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for (i = 0; i < entries; i++) {
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rhl_test_objects[i].value.id = k;
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err = rhltable_insert(&rhlt, &rhl_test_objects[i].list_node,
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test_rht_params);
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if (WARN(err, "error %d on element %d\n", err, i))
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break;
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if (err == 0)
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set_bit(i, obj_in_table);
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}
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if (err)
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ret = err;
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pr_info("test %d add/delete pairs into rhlist\n", entries);
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for (i = 0; i < entries; i++) {
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struct rhlist_head *h, *pos;
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struct test_obj_rhl *obj;
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struct test_obj_val key = {
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.id = k,
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};
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bool found;
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rcu_read_lock();
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h = rhltable_lookup(&rhlt, &key, test_rht_params);
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if (WARN(!h, "key not found during iteration %d of %d", i, entries)) {
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rcu_read_unlock();
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break;
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}
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if (i) {
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j = i - 1;
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rhl_for_each_entry_rcu(obj, pos, h, list_node) {
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if (WARN(pos == &rhl_test_objects[j].list_node, "old element found, should be gone"))
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break;
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}
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}
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cond_resched_rcu();
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found = false;
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rhl_for_each_entry_rcu(obj, pos, h, list_node) {
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if (pos == &rhl_test_objects[i].list_node) {
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found = true;
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break;
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}
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}
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rcu_read_unlock();
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if (WARN(!found, "element %d not found", i))
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break;
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err = rhltable_remove(&rhlt, &rhl_test_objects[i].list_node, test_rht_params);
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WARN(err, "rhltable_remove: err %d for iteration %d\n", err, i);
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if (err == 0)
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clear_bit(i, obj_in_table);
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}
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if (ret == 0 && err)
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ret = err;
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for (i = 0; i < entries; i++) {
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WARN(test_bit(i, obj_in_table), "elem %d allegedly still present", i);
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err = rhltable_insert(&rhlt, &rhl_test_objects[i].list_node,
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test_rht_params);
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if (WARN(err, "error %d on element %d\n", err, i))
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break;
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if (err == 0)
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set_bit(i, obj_in_table);
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}
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pr_info("test %d random rhlist add/delete operations\n", entries);
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for (j = 0; j < entries; j++) {
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u32 i = prandom_u32_max(entries);
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u32 prand = prandom_u32();
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cond_resched();
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if (prand == 0)
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prand = prandom_u32();
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if (prand & 1) {
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prand >>= 1;
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continue;
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}
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err = rhltable_remove(&rhlt, &rhl_test_objects[i].list_node, test_rht_params);
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if (test_bit(i, obj_in_table)) {
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clear_bit(i, obj_in_table);
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if (WARN(err, "cannot remove element at slot %d", i))
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continue;
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} else {
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if (WARN(err != -ENOENT, "removed non-existent element %d, error %d not %d",
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i, err, -ENOENT))
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continue;
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}
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if (prand & 1) {
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prand >>= 1;
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continue;
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}
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err = rhltable_insert(&rhlt, &rhl_test_objects[i].list_node, test_rht_params);
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if (err == 0) {
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if (WARN(test_and_set_bit(i, obj_in_table), "succeeded to insert same object %d", i))
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continue;
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} else {
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if (WARN(!test_bit(i, obj_in_table), "failed to insert object %d", i))
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continue;
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}
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if (prand & 1) {
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prand >>= 1;
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continue;
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}
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i = prandom_u32_max(entries);
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if (test_bit(i, obj_in_table)) {
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err = rhltable_remove(&rhlt, &rhl_test_objects[i].list_node, test_rht_params);
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WARN(err, "cannot remove element at slot %d", i);
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if (err == 0)
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clear_bit(i, obj_in_table);
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} else {
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err = rhltable_insert(&rhlt, &rhl_test_objects[i].list_node, test_rht_params);
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WARN(err, "failed to insert object %d", i);
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if (err == 0)
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set_bit(i, obj_in_table);
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}
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}
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for (i = 0; i < entries; i++) {
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cond_resched();
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err = rhltable_remove(&rhlt, &rhl_test_objects[i].list_node, test_rht_params);
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if (test_bit(i, obj_in_table)) {
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if (WARN(err, "cannot remove element at slot %d", i))
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continue;
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} else {
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if (WARN(err != -ENOENT, "removed non-existent element, error %d not %d",
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err, -ENOENT))
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continue;
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}
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}
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rhltable_destroy(&rhlt);
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out_free:
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vfree(rhl_test_objects);
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vfree(obj_in_table);
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return ret;
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}
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static int __init test_rhashtable_max(struct test_obj *array,
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unsigned int entries)
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{
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unsigned int i, insert_retries = 0;
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int err;
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test_rht_params.max_size = roundup_pow_of_two(entries / 8);
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err = rhashtable_init(&ht, &test_rht_params);
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if (err)
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return err;
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for (i = 0; i < ht.max_elems; i++) {
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struct test_obj *obj = &array[i];
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obj->value.id = i * 2;
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err = insert_retry(&ht, obj, test_rht_params);
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if (err > 0)
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insert_retries += err;
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else if (err)
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return err;
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}
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err = insert_retry(&ht, &array[ht.max_elems], test_rht_params);
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if (err == -E2BIG) {
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err = 0;
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} else {
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pr_info("insert element %u should have failed with %d, got %d\n",
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ht.max_elems, -E2BIG, err);
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if (err == 0)
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err = -1;
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}
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rhashtable_destroy(&ht);
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return err;
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}
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static unsigned int __init print_ht(struct rhltable *rhlt)
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{
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struct rhashtable *ht;
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const struct bucket_table *tbl;
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char buff[512] = "";
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unsigned int i, cnt = 0;
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ht = &rhlt->ht;
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/* Take the mutex to avoid RCU warning */
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mutex_lock(&ht->mutex);
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tbl = rht_dereference(ht->tbl, ht);
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for (i = 0; i < tbl->size; i++) {
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struct rhash_head *pos, *next;
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struct test_obj_rhl *p;
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pos = rht_ptr_exclusive(tbl->buckets + i);
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next = !rht_is_a_nulls(pos) ? rht_dereference(pos->next, ht) : NULL;
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if (!rht_is_a_nulls(pos)) {
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sprintf(buff, "%s\nbucket[%d] -> ", buff, i);
|
|
}
|
|
|
|
while (!rht_is_a_nulls(pos)) {
|
|
struct rhlist_head *list = container_of(pos, struct rhlist_head, rhead);
|
|
sprintf(buff, "%s[[", buff);
|
|
do {
|
|
pos = &list->rhead;
|
|
list = rht_dereference(list->next, ht);
|
|
p = rht_obj(ht, pos);
|
|
|
|
sprintf(buff, "%s val %d (tid=%d)%s", buff, p->value.id, p->value.tid,
|
|
list? ", " : " ");
|
|
cnt++;
|
|
} while (list);
|
|
|
|
pos = next,
|
|
next = !rht_is_a_nulls(pos) ?
|
|
rht_dereference(pos->next, ht) : NULL;
|
|
|
|
sprintf(buff, "%s]]%s", buff, !rht_is_a_nulls(pos) ? " -> " : "");
|
|
}
|
|
}
|
|
printk(KERN_ERR "\n---- ht: ----%s\n-------------\n", buff);
|
|
mutex_unlock(&ht->mutex);
|
|
|
|
return cnt;
|
|
}
|
|
|
|
static int __init test_insert_dup(struct test_obj_rhl *rhl_test_objects,
|
|
int cnt, bool slow)
|
|
{
|
|
struct rhltable *rhlt;
|
|
unsigned int i, ret;
|
|
const char *key;
|
|
int err = 0;
|
|
|
|
rhlt = kmalloc(sizeof(*rhlt), GFP_KERNEL);
|
|
if (WARN_ON(!rhlt))
|
|
return -EINVAL;
|
|
|
|
err = rhltable_init(rhlt, &test_rht_params_dup);
|
|
if (WARN_ON(err)) {
|
|
kfree(rhlt);
|
|
return err;
|
|
}
|
|
|
|
for (i = 0; i < cnt; i++) {
|
|
rhl_test_objects[i].value.tid = i;
|
|
key = rht_obj(&rhlt->ht, &rhl_test_objects[i].list_node.rhead);
|
|
key += test_rht_params_dup.key_offset;
|
|
|
|
if (slow) {
|
|
err = PTR_ERR(rhashtable_insert_slow(&rhlt->ht, key,
|
|
&rhl_test_objects[i].list_node.rhead));
|
|
if (err == -EAGAIN)
|
|
err = 0;
|
|
} else
|
|
err = rhltable_insert(rhlt,
|
|
&rhl_test_objects[i].list_node,
|
|
test_rht_params_dup);
|
|
if (WARN(err, "error %d on element %d/%d (%s)\n", err, i, cnt, slow? "slow" : "fast"))
|
|
goto skip_print;
|
|
}
|
|
|
|
ret = print_ht(rhlt);
|
|
WARN(ret != cnt, "missing rhltable elements (%d != %d, %s)\n", ret, cnt, slow? "slow" : "fast");
|
|
|
|
skip_print:
|
|
rhltable_destroy(rhlt);
|
|
kfree(rhlt);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init test_insert_duplicates_run(void)
|
|
{
|
|
struct test_obj_rhl rhl_test_objects[3] = {};
|
|
|
|
pr_info("test inserting duplicates\n");
|
|
|
|
/* two different values that map to same bucket */
|
|
rhl_test_objects[0].value.id = 1;
|
|
rhl_test_objects[1].value.id = 21;
|
|
|
|
/* and another duplicate with same as [0] value
|
|
* which will be second on the bucket list */
|
|
rhl_test_objects[2].value.id = rhl_test_objects[0].value.id;
|
|
|
|
test_insert_dup(rhl_test_objects, 2, false);
|
|
test_insert_dup(rhl_test_objects, 3, false);
|
|
test_insert_dup(rhl_test_objects, 2, true);
|
|
test_insert_dup(rhl_test_objects, 3, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int thread_lookup_test(struct thread_data *tdata)
|
|
{
|
|
unsigned int entries = tdata->entries;
|
|
int i, err = 0;
|
|
|
|
for (i = 0; i < entries; i++) {
|
|
struct test_obj *obj;
|
|
struct test_obj_val key = {
|
|
.id = i,
|
|
.tid = tdata->id,
|
|
};
|
|
|
|
obj = rhashtable_lookup_fast(&ht, &key, test_rht_params);
|
|
if (obj && (tdata->objs[i].value.id == TEST_INSERT_FAIL)) {
|
|
pr_err(" found unexpected object %d-%d\n", key.tid, key.id);
|
|
err++;
|
|
} else if (!obj && (tdata->objs[i].value.id != TEST_INSERT_FAIL)) {
|
|
pr_err(" object %d-%d not found!\n", key.tid, key.id);
|
|
err++;
|
|
} else if (obj && memcmp(&obj->value, &key, sizeof(key))) {
|
|
pr_err(" wrong object returned (got %d-%d, expected %d-%d)\n",
|
|
obj->value.tid, obj->value.id, key.tid, key.id);
|
|
err++;
|
|
}
|
|
|
|
cond_resched();
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int threadfunc(void *data)
|
|
{
|
|
int i, step, err = 0, insert_retries = 0;
|
|
struct thread_data *tdata = data;
|
|
|
|
if (atomic_dec_and_test(&startup_count))
|
|
wake_up(&startup_wait);
|
|
if (wait_event_interruptible(startup_wait, atomic_read(&startup_count) == -1)) {
|
|
pr_err(" thread[%d]: interrupted\n", tdata->id);
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < tdata->entries; i++) {
|
|
tdata->objs[i].value.id = i;
|
|
tdata->objs[i].value.tid = tdata->id;
|
|
err = insert_retry(&ht, &tdata->objs[i], test_rht_params);
|
|
if (err > 0) {
|
|
insert_retries += err;
|
|
} else if (err) {
|
|
pr_err(" thread[%d]: rhashtable_insert_fast failed\n",
|
|
tdata->id);
|
|
goto out;
|
|
}
|
|
}
|
|
if (insert_retries)
|
|
pr_info(" thread[%d]: %u insertions retried due to memory pressure\n",
|
|
tdata->id, insert_retries);
|
|
|
|
err = thread_lookup_test(tdata);
|
|
if (err) {
|
|
pr_err(" thread[%d]: rhashtable_lookup_test failed\n",
|
|
tdata->id);
|
|
goto out;
|
|
}
|
|
|
|
for (step = 10; step > 0; step--) {
|
|
for (i = 0; i < tdata->entries; i += step) {
|
|
if (tdata->objs[i].value.id == TEST_INSERT_FAIL)
|
|
continue;
|
|
err = rhashtable_remove_fast(&ht, &tdata->objs[i].node,
|
|
test_rht_params);
|
|
if (err) {
|
|
pr_err(" thread[%d]: rhashtable_remove_fast failed\n",
|
|
tdata->id);
|
|
goto out;
|
|
}
|
|
tdata->objs[i].value.id = TEST_INSERT_FAIL;
|
|
|
|
cond_resched();
|
|
}
|
|
err = thread_lookup_test(tdata);
|
|
if (err) {
|
|
pr_err(" thread[%d]: rhashtable_lookup_test (2) failed\n",
|
|
tdata->id);
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
while (!kthread_should_stop()) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule();
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int __init test_rht_init(void)
|
|
{
|
|
unsigned int entries;
|
|
int i, err, started_threads = 0, failed_threads = 0;
|
|
u64 total_time = 0;
|
|
struct thread_data *tdata;
|
|
struct test_obj *objs;
|
|
|
|
if (parm_entries < 0)
|
|
parm_entries = 1;
|
|
|
|
entries = min(parm_entries, MAX_ENTRIES);
|
|
|
|
test_rht_params.automatic_shrinking = shrinking;
|
|
test_rht_params.max_size = max_size ? : roundup_pow_of_two(entries);
|
|
test_rht_params.nelem_hint = size;
|
|
|
|
objs = vzalloc(array_size(sizeof(struct test_obj),
|
|
test_rht_params.max_size + 1));
|
|
if (!objs)
|
|
return -ENOMEM;
|
|
|
|
pr_info("Running rhashtable test nelem=%d, max_size=%d, shrinking=%d\n",
|
|
size, max_size, shrinking);
|
|
|
|
for (i = 0; i < runs; i++) {
|
|
s64 time;
|
|
|
|
pr_info("Test %02d:\n", i);
|
|
memset(objs, 0, test_rht_params.max_size * sizeof(struct test_obj));
|
|
|
|
err = rhashtable_init(&ht, &test_rht_params);
|
|
if (err < 0) {
|
|
pr_warn("Test failed: Unable to initialize hashtable: %d\n",
|
|
err);
|
|
continue;
|
|
}
|
|
|
|
time = test_rhashtable(&ht, objs, entries);
|
|
rhashtable_destroy(&ht);
|
|
if (time < 0) {
|
|
vfree(objs);
|
|
pr_warn("Test failed: return code %lld\n", time);
|
|
return -EINVAL;
|
|
}
|
|
|
|
total_time += time;
|
|
}
|
|
|
|
pr_info("test if its possible to exceed max_size %d: %s\n",
|
|
test_rht_params.max_size, test_rhashtable_max(objs, entries) == 0 ?
|
|
"no, ok" : "YES, failed");
|
|
vfree(objs);
|
|
|
|
do_div(total_time, runs);
|
|
pr_info("Average test time: %llu\n", total_time);
|
|
|
|
test_insert_duplicates_run();
|
|
|
|
if (!tcount)
|
|
return 0;
|
|
|
|
pr_info("Testing concurrent rhashtable access from %d threads\n",
|
|
tcount);
|
|
atomic_set(&startup_count, tcount);
|
|
tdata = vzalloc(array_size(tcount, sizeof(struct thread_data)));
|
|
if (!tdata)
|
|
return -ENOMEM;
|
|
objs = vzalloc(array3_size(sizeof(struct test_obj), tcount, entries));
|
|
if (!objs) {
|
|
vfree(tdata);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
test_rht_params.max_size = max_size ? :
|
|
roundup_pow_of_two(tcount * entries);
|
|
err = rhashtable_init(&ht, &test_rht_params);
|
|
if (err < 0) {
|
|
pr_warn("Test failed: Unable to initialize hashtable: %d\n",
|
|
err);
|
|
vfree(tdata);
|
|
vfree(objs);
|
|
return -EINVAL;
|
|
}
|
|
for (i = 0; i < tcount; i++) {
|
|
tdata[i].id = i;
|
|
tdata[i].entries = entries;
|
|
tdata[i].objs = objs + i * entries;
|
|
tdata[i].task = kthread_run(threadfunc, &tdata[i],
|
|
"rhashtable_thrad[%d]", i);
|
|
if (IS_ERR(tdata[i].task)) {
|
|
pr_err(" kthread_run failed for thread %d\n", i);
|
|
atomic_dec(&startup_count);
|
|
} else {
|
|
started_threads++;
|
|
}
|
|
}
|
|
if (wait_event_interruptible(startup_wait, atomic_read(&startup_count) == 0))
|
|
pr_err(" wait_event interruptible failed\n");
|
|
/* count is 0 now, set it to -1 and wake up all threads together */
|
|
atomic_dec(&startup_count);
|
|
wake_up_all(&startup_wait);
|
|
for (i = 0; i < tcount; i++) {
|
|
if (IS_ERR(tdata[i].task))
|
|
continue;
|
|
if ((err = kthread_stop(tdata[i].task))) {
|
|
pr_warn("Test failed: thread %d returned: %d\n",
|
|
i, err);
|
|
failed_threads++;
|
|
}
|
|
}
|
|
rhashtable_destroy(&ht);
|
|
vfree(tdata);
|
|
vfree(objs);
|
|
|
|
/*
|
|
* rhltable_remove is very expensive, default values can cause test
|
|
* to run for 2 minutes or more, use a smaller number instead.
|
|
*/
|
|
err = test_rhltable(entries / 16);
|
|
pr_info("Started %d threads, %d failed, rhltable test returns %d\n",
|
|
started_threads, failed_threads, err);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit test_rht_exit(void)
|
|
{
|
|
}
|
|
|
|
module_init(test_rht_init);
|
|
module_exit(test_rht_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|