521 lines
15 KiB
C
521 lines
15 KiB
C
/*
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* Throttle infrastructure tests
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*
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* Copyright Nodalink, SARL. 2013
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*
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* Authors:
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* Benoît Canet <benoit.canet@irqsave.net>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2 or later.
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* See the COPYING.LIB file in the top-level directory.
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*/
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#include <glib.h>
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#include <math.h>
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#include "block/aio.h"
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#include "qemu/throttle.h"
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static AioContext *ctx;
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static LeakyBucket bkt;
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static ThrottleConfig cfg;
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static ThrottleState ts;
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/* useful function */
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static bool double_cmp(double x, double y)
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{
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return fabsl(x - y) < 1e-6;
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}
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/* tests for single bucket operations */
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static void test_leak_bucket(void)
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{
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/* set initial value */
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bkt.avg = 150;
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bkt.max = 15;
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bkt.level = 1.5;
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/* leak an op work of time */
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throttle_leak_bucket(&bkt, NANOSECONDS_PER_SECOND / 150);
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g_assert(bkt.avg == 150);
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g_assert(bkt.max == 15);
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g_assert(double_cmp(bkt.level, 0.5));
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/* leak again emptying the bucket */
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throttle_leak_bucket(&bkt, NANOSECONDS_PER_SECOND / 150);
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g_assert(bkt.avg == 150);
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g_assert(bkt.max == 15);
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g_assert(double_cmp(bkt.level, 0));
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/* check that the bucket level won't go lower */
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throttle_leak_bucket(&bkt, NANOSECONDS_PER_SECOND / 150);
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g_assert(bkt.avg == 150);
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g_assert(bkt.max == 15);
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g_assert(double_cmp(bkt.level, 0));
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}
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static void test_compute_wait(void)
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{
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int64_t wait;
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int64_t result;
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/* no operation limit set */
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bkt.avg = 0;
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bkt.max = 15;
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bkt.level = 1.5;
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wait = throttle_compute_wait(&bkt);
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g_assert(!wait);
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/* zero delta */
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bkt.avg = 150;
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bkt.max = 15;
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bkt.level = 15;
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wait = throttle_compute_wait(&bkt);
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g_assert(!wait);
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/* below zero delta */
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bkt.avg = 150;
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bkt.max = 15;
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bkt.level = 9;
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wait = throttle_compute_wait(&bkt);
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g_assert(!wait);
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/* half an operation above max */
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bkt.avg = 150;
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bkt.max = 15;
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bkt.level = 15.5;
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wait = throttle_compute_wait(&bkt);
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/* time required to do half an operation */
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result = (int64_t) NANOSECONDS_PER_SECOND / 150 / 2;
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g_assert(wait == result);
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}
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/* functions to test ThrottleState initialization/destroy methods */
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static void read_timer_cb(void *opaque)
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{
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}
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static void write_timer_cb(void *opaque)
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{
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}
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static void test_init(void)
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{
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int i;
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/* fill the structure with crap */
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memset(&ts, 1, sizeof(ts));
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/* init the structure */
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throttle_init(&ts, ctx, QEMU_CLOCK_VIRTUAL,
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read_timer_cb, write_timer_cb, &ts);
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/* check initialized fields */
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g_assert(ts.clock_type == QEMU_CLOCK_VIRTUAL);
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g_assert(ts.timers[0]);
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g_assert(ts.timers[1]);
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/* check other fields where cleared */
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g_assert(!ts.previous_leak);
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g_assert(!ts.cfg.op_size);
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for (i = 0; i < BUCKETS_COUNT; i++) {
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g_assert(!ts.cfg.buckets[i].avg);
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g_assert(!ts.cfg.buckets[i].max);
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g_assert(!ts.cfg.buckets[i].level);
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}
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throttle_destroy(&ts);
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}
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static void test_destroy(void)
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{
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int i;
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throttle_init(&ts, ctx, QEMU_CLOCK_VIRTUAL,
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read_timer_cb, write_timer_cb, &ts);
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throttle_destroy(&ts);
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for (i = 0; i < 2; i++) {
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g_assert(!ts.timers[i]);
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}
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}
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/* function to test throttle_config and throttle_get_config */
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static void test_config_functions(void)
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{
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int i;
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ThrottleConfig orig_cfg, final_cfg;
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orig_cfg.buckets[THROTTLE_BPS_TOTAL].avg = 153;
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orig_cfg.buckets[THROTTLE_BPS_READ].avg = 56;
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orig_cfg.buckets[THROTTLE_BPS_WRITE].avg = 1;
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orig_cfg.buckets[THROTTLE_OPS_TOTAL].avg = 150;
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orig_cfg.buckets[THROTTLE_OPS_READ].avg = 69;
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orig_cfg.buckets[THROTTLE_OPS_WRITE].avg = 23;
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orig_cfg.buckets[THROTTLE_BPS_TOTAL].max = 0; /* should be corrected */
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orig_cfg.buckets[THROTTLE_BPS_READ].max = 1; /* should not be corrected */
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orig_cfg.buckets[THROTTLE_BPS_WRITE].max = 120;
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orig_cfg.buckets[THROTTLE_OPS_TOTAL].max = 150;
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orig_cfg.buckets[THROTTLE_OPS_READ].max = 400;
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orig_cfg.buckets[THROTTLE_OPS_WRITE].max = 500;
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orig_cfg.buckets[THROTTLE_BPS_TOTAL].level = 45;
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orig_cfg.buckets[THROTTLE_BPS_READ].level = 65;
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orig_cfg.buckets[THROTTLE_BPS_WRITE].level = 23;
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orig_cfg.buckets[THROTTLE_OPS_TOTAL].level = 1;
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orig_cfg.buckets[THROTTLE_OPS_READ].level = 90;
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orig_cfg.buckets[THROTTLE_OPS_WRITE].level = 75;
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orig_cfg.op_size = 1;
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throttle_init(&ts, ctx, QEMU_CLOCK_VIRTUAL,
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read_timer_cb, write_timer_cb, &ts);
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/* structure reset by throttle_init previous_leak should be null */
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g_assert(!ts.previous_leak);
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throttle_config(&ts, &orig_cfg);
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/* has previous leak been initialized by throttle_config ? */
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g_assert(ts.previous_leak);
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/* get back the fixed configuration */
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throttle_get_config(&ts, &final_cfg);
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throttle_destroy(&ts);
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g_assert(final_cfg.buckets[THROTTLE_BPS_TOTAL].avg == 153);
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g_assert(final_cfg.buckets[THROTTLE_BPS_READ].avg == 56);
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g_assert(final_cfg.buckets[THROTTLE_BPS_WRITE].avg == 1);
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g_assert(final_cfg.buckets[THROTTLE_OPS_TOTAL].avg == 150);
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g_assert(final_cfg.buckets[THROTTLE_OPS_READ].avg == 69);
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g_assert(final_cfg.buckets[THROTTLE_OPS_WRITE].avg == 23);
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g_assert(final_cfg.buckets[THROTTLE_BPS_TOTAL].max == 15.3);/* fixed */
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g_assert(final_cfg.buckets[THROTTLE_BPS_READ].max == 1); /* not fixed */
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g_assert(final_cfg.buckets[THROTTLE_BPS_WRITE].max == 120);
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g_assert(final_cfg.buckets[THROTTLE_OPS_TOTAL].max == 150);
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g_assert(final_cfg.buckets[THROTTLE_OPS_READ].max == 400);
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g_assert(final_cfg.buckets[THROTTLE_OPS_WRITE].max == 500);
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g_assert(final_cfg.op_size == 1);
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/* check bucket have been cleared */
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for (i = 0; i < BUCKETS_COUNT; i++) {
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g_assert(!final_cfg.buckets[i].level);
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}
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}
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/* functions to test is throttle is enabled by a config */
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static void set_cfg_value(bool is_max, int index, int value)
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{
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if (is_max) {
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cfg.buckets[index].max = value;
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} else {
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cfg.buckets[index].avg = value;
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}
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}
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static void test_enabled(void)
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{
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int i;
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memset(&cfg, 0, sizeof(cfg));
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g_assert(!throttle_enabled(&cfg));
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for (i = 0; i < BUCKETS_COUNT; i++) {
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memset(&cfg, 0, sizeof(cfg));
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set_cfg_value(false, i, 150);
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g_assert(throttle_enabled(&cfg));
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}
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for (i = 0; i < BUCKETS_COUNT; i++) {
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memset(&cfg, 0, sizeof(cfg));
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set_cfg_value(false, i, -150);
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g_assert(!throttle_enabled(&cfg));
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}
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}
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/* tests functions for throttle_conflicting */
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static void test_conflicts_for_one_set(bool is_max,
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int total,
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int read,
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int write)
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{
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memset(&cfg, 0, sizeof(cfg));
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g_assert(!throttle_conflicting(&cfg));
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set_cfg_value(is_max, total, 1);
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set_cfg_value(is_max, read, 1);
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g_assert(throttle_conflicting(&cfg));
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memset(&cfg, 0, sizeof(cfg));
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set_cfg_value(is_max, total, 1);
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set_cfg_value(is_max, write, 1);
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g_assert(throttle_conflicting(&cfg));
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memset(&cfg, 0, sizeof(cfg));
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set_cfg_value(is_max, total, 1);
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set_cfg_value(is_max, read, 1);
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set_cfg_value(is_max, write, 1);
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g_assert(throttle_conflicting(&cfg));
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memset(&cfg, 0, sizeof(cfg));
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set_cfg_value(is_max, total, 1);
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g_assert(!throttle_conflicting(&cfg));
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memset(&cfg, 0, sizeof(cfg));
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set_cfg_value(is_max, read, 1);
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set_cfg_value(is_max, write, 1);
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g_assert(!throttle_conflicting(&cfg));
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}
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static void test_conflicting_config(void)
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{
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/* bps average conflicts */
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test_conflicts_for_one_set(false,
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THROTTLE_BPS_TOTAL,
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THROTTLE_BPS_READ,
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THROTTLE_BPS_WRITE);
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/* ops average conflicts */
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test_conflicts_for_one_set(false,
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THROTTLE_OPS_TOTAL,
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THROTTLE_OPS_READ,
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THROTTLE_OPS_WRITE);
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/* bps average conflicts */
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test_conflicts_for_one_set(true,
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THROTTLE_BPS_TOTAL,
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THROTTLE_BPS_READ,
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THROTTLE_BPS_WRITE);
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/* ops average conflicts */
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test_conflicts_for_one_set(true,
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THROTTLE_OPS_TOTAL,
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THROTTLE_OPS_READ,
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THROTTLE_OPS_WRITE);
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}
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/* functions to test the throttle_is_valid function */
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static void test_is_valid_for_value(int value, bool should_be_valid)
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{
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int is_max, index;
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for (is_max = 0; is_max < 2; is_max++) {
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for (index = 0; index < BUCKETS_COUNT; index++) {
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memset(&cfg, 0, sizeof(cfg));
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set_cfg_value(is_max, index, value);
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g_assert(throttle_is_valid(&cfg) == should_be_valid);
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}
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}
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}
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static void test_is_valid(void)
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{
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/* negative number are invalid */
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test_is_valid_for_value(-1, false);
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/* zero are valids */
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test_is_valid_for_value(0, true);
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/* positives numers are valids */
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test_is_valid_for_value(1, true);
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}
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static void test_have_timer(void)
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{
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/* zero the structure */
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memset(&ts, 0, sizeof(ts));
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/* no timer set should return false */
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g_assert(!throttle_have_timer(&ts));
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/* init the structure */
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throttle_init(&ts, ctx, QEMU_CLOCK_VIRTUAL,
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read_timer_cb, write_timer_cb, &ts);
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/* timer set by init should return true */
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g_assert(throttle_have_timer(&ts));
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throttle_destroy(&ts);
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}
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static void test_detach_attach(void)
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{
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/* zero the structure */
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memset(&ts, 0, sizeof(ts));
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/* init the structure */
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throttle_init(&ts, ctx, QEMU_CLOCK_VIRTUAL,
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read_timer_cb, write_timer_cb, &ts);
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/* timer set by init should return true */
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g_assert(throttle_have_timer(&ts));
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/* timer should no longer exist after detaching */
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throttle_detach_aio_context(&ts);
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g_assert(!throttle_have_timer(&ts));
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/* timer should exist again after attaching */
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throttle_attach_aio_context(&ts, ctx);
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g_assert(throttle_have_timer(&ts));
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throttle_destroy(&ts);
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}
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static bool do_test_accounting(bool is_ops, /* are we testing bps or ops */
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int size, /* size of the operation to do */
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double avg, /* io limit */
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uint64_t op_size, /* ideal size of an io */
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double total_result,
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double read_result,
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double write_result)
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{
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BucketType to_test[2][3] = { { THROTTLE_BPS_TOTAL,
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THROTTLE_BPS_READ,
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THROTTLE_BPS_WRITE, },
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{ THROTTLE_OPS_TOTAL,
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THROTTLE_OPS_READ,
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THROTTLE_OPS_WRITE, } };
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ThrottleConfig cfg;
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BucketType index;
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int i;
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for (i = 0; i < 3; i++) {
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BucketType index = to_test[is_ops][i];
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cfg.buckets[index].avg = avg;
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}
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cfg.op_size = op_size;
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throttle_init(&ts, ctx, QEMU_CLOCK_VIRTUAL,
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read_timer_cb, write_timer_cb, &ts);
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throttle_config(&ts, &cfg);
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/* account a read */
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throttle_account(&ts, false, size);
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/* account a write */
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throttle_account(&ts, true, size);
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/* check total result */
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index = to_test[is_ops][0];
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if (!double_cmp(ts.cfg.buckets[index].level, total_result)) {
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return false;
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}
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/* check read result */
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index = to_test[is_ops][1];
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if (!double_cmp(ts.cfg.buckets[index].level, read_result)) {
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return false;
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}
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/* check write result */
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index = to_test[is_ops][2];
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if (!double_cmp(ts.cfg.buckets[index].level, write_result)) {
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return false;
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}
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throttle_destroy(&ts);
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return true;
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}
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static void test_accounting(void)
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{
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/* tests for bps */
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/* op of size 1 */
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g_assert(do_test_accounting(false,
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1 * 512,
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150,
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0,
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1024,
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512,
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512));
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/* op of size 2 */
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g_assert(do_test_accounting(false,
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2 * 512,
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150,
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0,
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2048,
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1024,
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1024));
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/* op of size 2 and orthogonal parameter change */
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g_assert(do_test_accounting(false,
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2 * 512,
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150,
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17,
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2048,
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1024,
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1024));
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/* tests for ops */
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/* op of size 1 */
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g_assert(do_test_accounting(true,
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1 * 512,
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150,
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0,
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2,
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1,
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1));
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/* op of size 2 */
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g_assert(do_test_accounting(true,
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2 * 512,
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150,
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0,
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2,
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1,
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1));
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/* jumbo op accounting fragmentation : size 64 with op size of 13 units */
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g_assert(do_test_accounting(true,
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64 * 512,
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150,
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13 * 512,
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(64.0 * 2) / 13,
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(64.0 / 13),
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(64.0 / 13)));
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/* same with orthogonal parameters changes */
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g_assert(do_test_accounting(true,
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64 * 512,
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300,
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13 * 512,
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(64.0 * 2) / 13,
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(64.0 / 13),
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(64.0 / 13)));
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}
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int main(int argc, char **argv)
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{
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GSource *src;
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init_clocks();
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ctx = aio_context_new();
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src = aio_get_g_source(ctx);
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g_source_attach(src, NULL);
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g_source_unref(src);
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do {} while (g_main_context_iteration(NULL, false));
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/* tests in the same order as the header function declarations */
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g_test_init(&argc, &argv, NULL);
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g_test_add_func("/throttle/leak_bucket", test_leak_bucket);
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g_test_add_func("/throttle/compute_wait", test_compute_wait);
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g_test_add_func("/throttle/init", test_init);
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g_test_add_func("/throttle/destroy", test_destroy);
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g_test_add_func("/throttle/have_timer", test_have_timer);
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g_test_add_func("/throttle/detach_attach", test_detach_attach);
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g_test_add_func("/throttle/config/enabled", test_enabled);
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g_test_add_func("/throttle/config/conflicting", test_conflicting_config);
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g_test_add_func("/throttle/config/is_valid", test_is_valid);
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g_test_add_func("/throttle/config_functions", test_config_functions);
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g_test_add_func("/throttle/accounting", test_accounting);
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return g_test_run();
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}
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