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lib: Introduce priority array area manager
This introduces a infrastructure for management of linear priority areas. Priority order in an array matters, however order of items inside a priority group does not matter. As an initial implementation, L-sort algorithm is used. It is quite trivial. More advanced algorithm called P-sort will be introduced as a follow-up. The infrastructure is prepared for other algos. Alongside this, a testing module is introduced as well. Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko
committed by
David S. Miller
David S. Miller
parent
b862815c3e
commit
44091d29f2
395
lib/test_parman.c
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395
lib/test_parman.c
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/*
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* lib/test_parman.c - Test module for parman
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* Copyright (c) 2017 Mellanox Technologies. All rights reserved.
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* Copyright (c) 2017 Jiri Pirko <jiri@mellanox.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include <linux/err.h>
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#include <linux/random.h>
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#include <linux/parman.h>
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#define TEST_PARMAN_PRIO_SHIFT 7 /* defines number of prios for testing */
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#define TEST_PARMAN_PRIO_COUNT BIT(TEST_PARMAN_PRIO_SHIFT)
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#define TEST_PARMAN_PRIO_MASK (TEST_PARMAN_PRIO_COUNT - 1)
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#define TEST_PARMAN_ITEM_SHIFT 13 /* defines a total number
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* of items for testing
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*/
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#define TEST_PARMAN_ITEM_COUNT BIT(TEST_PARMAN_ITEM_SHIFT)
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#define TEST_PARMAN_ITEM_MASK (TEST_PARMAN_ITEM_COUNT - 1)
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#define TEST_PARMAN_BASE_SHIFT 8
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#define TEST_PARMAN_BASE_COUNT BIT(TEST_PARMAN_BASE_SHIFT)
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#define TEST_PARMAN_RESIZE_STEP_SHIFT 7
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#define TEST_PARMAN_RESIZE_STEP_COUNT BIT(TEST_PARMAN_RESIZE_STEP_SHIFT)
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#define TEST_PARMAN_BULK_MAX_SHIFT (2 + TEST_PARMAN_RESIZE_STEP_SHIFT)
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#define TEST_PARMAN_BULK_MAX_COUNT BIT(TEST_PARMAN_BULK_MAX_SHIFT)
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#define TEST_PARMAN_BULK_MAX_MASK (TEST_PARMAN_BULK_MAX_COUNT - 1)
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#define TEST_PARMAN_RUN_BUDGET (TEST_PARMAN_ITEM_COUNT * 256)
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struct test_parman_prio {
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struct parman_prio parman_prio;
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unsigned long priority;
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};
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struct test_parman_item {
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struct parman_item parman_item;
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struct test_parman_prio *prio;
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bool used;
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};
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struct test_parman {
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struct parman *parman;
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struct test_parman_item **prio_array;
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unsigned long prio_array_limit;
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struct test_parman_prio prios[TEST_PARMAN_PRIO_COUNT];
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struct test_parman_item items[TEST_PARMAN_ITEM_COUNT];
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struct rnd_state rnd;
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unsigned long run_budget;
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unsigned long bulk_budget;
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bool bulk_noop;
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unsigned int used_items;
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};
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#define ITEM_PTRS_SIZE(count) (sizeof(struct test_parman_item *) * (count))
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static int test_parman_resize(void *priv, unsigned long new_count)
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{
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struct test_parman *test_parman = priv;
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struct test_parman_item **prio_array;
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unsigned long old_count;
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prio_array = krealloc(test_parman->prio_array,
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ITEM_PTRS_SIZE(new_count), GFP_KERNEL);
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if (new_count == 0)
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return 0;
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if (!prio_array)
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return -ENOMEM;
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old_count = test_parman->prio_array_limit;
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if (new_count > old_count)
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memset(&prio_array[old_count], 0,
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ITEM_PTRS_SIZE(new_count - old_count));
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test_parman->prio_array = prio_array;
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test_parman->prio_array_limit = new_count;
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return 0;
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}
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static void test_parman_move(void *priv, unsigned long from_index,
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unsigned long to_index, unsigned long count)
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{
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struct test_parman *test_parman = priv;
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struct test_parman_item **prio_array = test_parman->prio_array;
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memmove(&prio_array[to_index], &prio_array[from_index],
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ITEM_PTRS_SIZE(count));
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memset(&prio_array[from_index], 0, ITEM_PTRS_SIZE(count));
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}
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static const struct parman_ops test_parman_lsort_ops = {
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.base_count = TEST_PARMAN_BASE_COUNT,
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.resize_step = TEST_PARMAN_RESIZE_STEP_COUNT,
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.resize = test_parman_resize,
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.move = test_parman_move,
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.algo = PARMAN_ALGO_TYPE_LSORT,
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};
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static void test_parman_rnd_init(struct test_parman *test_parman)
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{
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prandom_seed_state(&test_parman->rnd, 3141592653589793238ULL);
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}
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static u32 test_parman_rnd_get(struct test_parman *test_parman)
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{
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return prandom_u32_state(&test_parman->rnd);
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}
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static unsigned long test_parman_priority_gen(struct test_parman *test_parman)
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{
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unsigned long priority;
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int i;
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again:
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priority = test_parman_rnd_get(test_parman);
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if (priority == 0)
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goto again;
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for (i = 0; i < TEST_PARMAN_PRIO_COUNT; i++) {
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struct test_parman_prio *prio = &test_parman->prios[i];
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if (prio->priority == 0)
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break;
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if (prio->priority == priority)
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goto again;
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}
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return priority;
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}
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static void test_parman_prios_init(struct test_parman *test_parman)
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{
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int i;
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for (i = 0; i < TEST_PARMAN_PRIO_COUNT; i++) {
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struct test_parman_prio *prio = &test_parman->prios[i];
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/* Assign random uniqueue priority to each prio structure */
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prio->priority = test_parman_priority_gen(test_parman);
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parman_prio_init(test_parman->parman, &prio->parman_prio,
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prio->priority);
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}
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}
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static void test_parman_prios_fini(struct test_parman *test_parman)
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{
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int i;
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for (i = 0; i < TEST_PARMAN_PRIO_COUNT; i++) {
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struct test_parman_prio *prio = &test_parman->prios[i];
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parman_prio_fini(&prio->parman_prio);
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}
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}
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static void test_parman_items_init(struct test_parman *test_parman)
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{
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int i;
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for (i = 0; i < TEST_PARMAN_ITEM_COUNT; i++) {
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struct test_parman_item *item = &test_parman->items[i];
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unsigned int prio_index = test_parman_rnd_get(test_parman) &
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TEST_PARMAN_PRIO_MASK;
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/* Assign random prio to each item structure */
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item->prio = &test_parman->prios[prio_index];
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}
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}
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static void test_parman_items_fini(struct test_parman *test_parman)
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{
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int i;
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for (i = 0; i < TEST_PARMAN_ITEM_COUNT; i++) {
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struct test_parman_item *item = &test_parman->items[i];
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if (!item->used)
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continue;
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parman_item_remove(test_parman->parman,
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&item->prio->parman_prio,
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&item->parman_item);
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}
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}
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static struct test_parman *test_parman_create(const struct parman_ops *ops)
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{
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struct test_parman *test_parman;
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int err;
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test_parman = kzalloc(sizeof(*test_parman), GFP_KERNEL);
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if (!test_parman)
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return ERR_PTR(-ENOMEM);
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err = test_parman_resize(test_parman, TEST_PARMAN_BASE_COUNT);
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if (err)
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goto err_resize;
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test_parman->parman = parman_create(ops, test_parman);
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if (!test_parman->parman) {
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err = -ENOMEM;
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goto err_parman_create;
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}
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test_parman_rnd_init(test_parman);
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test_parman_prios_init(test_parman);
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test_parman_items_init(test_parman);
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test_parman->run_budget = TEST_PARMAN_RUN_BUDGET;
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return test_parman;
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err_parman_create:
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test_parman_resize(test_parman, 0);
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err_resize:
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kfree(test_parman);
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return ERR_PTR(err);
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}
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static void test_parman_destroy(struct test_parman *test_parman)
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{
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test_parman_items_fini(test_parman);
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test_parman_prios_fini(test_parman);
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parman_destroy(test_parman->parman);
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test_parman_resize(test_parman, 0);
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kfree(test_parman);
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}
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static bool test_parman_run_check_budgets(struct test_parman *test_parman)
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{
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if (test_parman->run_budget-- == 0)
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return false;
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if (test_parman->bulk_budget-- != 0)
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return true;
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test_parman->bulk_budget = test_parman_rnd_get(test_parman) &
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TEST_PARMAN_BULK_MAX_MASK;
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test_parman->bulk_noop = test_parman_rnd_get(test_parman) & 1;
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return true;
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}
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static int test_parman_run(struct test_parman *test_parman)
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{
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unsigned int i = test_parman_rnd_get(test_parman);
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int err;
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while (test_parman_run_check_budgets(test_parman)) {
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unsigned int item_index = i++ & TEST_PARMAN_ITEM_MASK;
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struct test_parman_item *item = &test_parman->items[item_index];
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if (test_parman->bulk_noop)
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continue;
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if (!item->used) {
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err = parman_item_add(test_parman->parman,
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&item->prio->parman_prio,
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&item->parman_item);
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if (err)
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return err;
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test_parman->prio_array[item->parman_item.index] = item;
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test_parman->used_items++;
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} else {
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test_parman->prio_array[item->parman_item.index] = NULL;
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parman_item_remove(test_parman->parman,
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&item->prio->parman_prio,
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&item->parman_item);
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test_parman->used_items--;
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}
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item->used = !item->used;
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}
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return 0;
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}
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static int test_parman_check_array(struct test_parman *test_parman,
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bool gaps_allowed)
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{
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unsigned int last_unused_items = 0;
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unsigned long last_priority = 0;
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unsigned int used_items = 0;
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int i;
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if (test_parman->prio_array_limit < TEST_PARMAN_BASE_COUNT) {
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pr_err("Array limit is lower than the base count (%lu < %lu)\n",
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test_parman->prio_array_limit, TEST_PARMAN_BASE_COUNT);
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return -EINVAL;
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}
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for (i = 0; i < test_parman->prio_array_limit; i++) {
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struct test_parman_item *item = test_parman->prio_array[i];
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if (!item) {
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last_unused_items++;
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continue;
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}
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if (last_unused_items && !gaps_allowed) {
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pr_err("Gap found in array even though they are forbidden\n");
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return -EINVAL;
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}
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last_unused_items = 0;
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used_items++;
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if (item->prio->priority < last_priority) {
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pr_err("Item belongs under higher priority then the last one (current: %lu, previous: %lu)\n",
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item->prio->priority, last_priority);
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return -EINVAL;
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}
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last_priority = item->prio->priority;
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if (item->parman_item.index != i) {
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pr_err("Item has different index in compare to where it actualy is (%lu != %d)\n",
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item->parman_item.index, i);
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return -EINVAL;
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}
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}
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if (used_items != test_parman->used_items) {
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pr_err("Number of used items in array does not match (%u != %u)\n",
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used_items, test_parman->used_items);
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return -EINVAL;
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}
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if (last_unused_items >= TEST_PARMAN_RESIZE_STEP_COUNT) {
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pr_err("Number of unused item at the end of array is bigger than resize step (%u >= %lu)\n",
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last_unused_items, TEST_PARMAN_RESIZE_STEP_COUNT);
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return -EINVAL;
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}
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pr_info("Priority array check successful\n");
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return 0;
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}
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static int test_parman_lsort(void)
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{
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struct test_parman *test_parman;
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int err;
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test_parman = test_parman_create(&test_parman_lsort_ops);
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if (IS_ERR(test_parman))
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return PTR_ERR(test_parman);
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err = test_parman_run(test_parman);
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if (err)
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goto out;
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err = test_parman_check_array(test_parman, false);
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if (err)
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goto out;
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out:
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test_parman_destroy(test_parman);
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return err;
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}
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static int __init test_parman_init(void)
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{
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return test_parman_lsort();
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}
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static void __exit test_parman_exit(void)
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{
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}
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module_init(test_parman_init);
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module_exit(test_parman_exit);
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
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MODULE_DESCRIPTION("Test module for parman");
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