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![Alberto Garcia](/assets/img/avatar_default.png)
If bkt->max == 0 and bkt->burst_length > 1 then we could have a division by 0 in throttle_do_compute_wait(). That configuration is however not permitted and is already detected by throttle_is_valid(), but let's assert it in throttle_compute_wait() to make it explicit. Found by Coverity (CID: 1381016). Signed-off-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
639 lines
20 KiB
C
639 lines
20 KiB
C
/*
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* QEMU throttling infrastructure
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*
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* Copyright (C) Nodalink, EURL. 2013-2014
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* Copyright (C) Igalia, S.L. 2015
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*
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* Authors:
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* Benoît Canet <benoit.canet@nodalink.com>
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* Alberto Garcia <berto@igalia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 or
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* (at your option) version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/throttle.h"
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#include "qemu/timer.h"
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#include "block/aio.h"
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/* This function make a bucket leak
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*
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* @bkt: the bucket to make leak
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* @delta_ns: the time delta
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*/
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void throttle_leak_bucket(LeakyBucket *bkt, int64_t delta_ns)
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{
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double leak;
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/* compute how much to leak */
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leak = (bkt->avg * (double) delta_ns) / NANOSECONDS_PER_SECOND;
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/* make the bucket leak */
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bkt->level = MAX(bkt->level - leak, 0);
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/* if we allow bursts for more than one second we also need to
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* keep track of bkt->burst_level so the bkt->max goal per second
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* is attained */
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if (bkt->burst_length > 1) {
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leak = (bkt->max * (double) delta_ns) / NANOSECONDS_PER_SECOND;
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bkt->burst_level = MAX(bkt->burst_level - leak, 0);
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}
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}
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/* Calculate the time delta since last leak and make proportionals leaks
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*
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* @now: the current timestamp in ns
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*/
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static void throttle_do_leak(ThrottleState *ts, int64_t now)
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{
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/* compute the time elapsed since the last leak */
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int64_t delta_ns = now - ts->previous_leak;
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int i;
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ts->previous_leak = now;
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if (delta_ns <= 0) {
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return;
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}
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/* make each bucket leak */
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for (i = 0; i < BUCKETS_COUNT; i++) {
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throttle_leak_bucket(&ts->cfg.buckets[i], delta_ns);
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}
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}
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/* do the real job of computing the time to wait
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*
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* @limit: the throttling limit
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* @extra: the number of operation to delay
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* @ret: the time to wait in ns
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*/
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static int64_t throttle_do_compute_wait(double limit, double extra)
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{
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double wait = extra * NANOSECONDS_PER_SECOND;
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wait /= limit;
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return wait;
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}
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/* This function compute the wait time in ns that a leaky bucket should trigger
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*
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* @bkt: the leaky bucket we operate on
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* @ret: the resulting wait time in ns or 0 if the operation can go through
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*/
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int64_t throttle_compute_wait(LeakyBucket *bkt)
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{
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double extra; /* the number of extra units blocking the io */
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double bucket_size; /* I/O before throttling to bkt->avg */
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double burst_bucket_size; /* Before throttling to bkt->max */
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if (!bkt->avg) {
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return 0;
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}
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if (!bkt->max) {
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/* If bkt->max is 0 we still want to allow short bursts of I/O
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* from the guest, otherwise every other request will be throttled
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* and performance will suffer considerably. */
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bucket_size = (double) bkt->avg / 10;
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burst_bucket_size = 0;
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} else {
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/* If we have a burst limit then we have to wait until all I/O
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* at burst rate has finished before throttling to bkt->avg */
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bucket_size = bkt->max * bkt->burst_length;
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burst_bucket_size = (double) bkt->max / 10;
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}
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/* If the main bucket is full then we have to wait */
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extra = bkt->level - bucket_size;
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if (extra > 0) {
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return throttle_do_compute_wait(bkt->avg, extra);
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}
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/* If the main bucket is not full yet we still have to check the
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* burst bucket in order to enforce the burst limit */
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if (bkt->burst_length > 1) {
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assert(bkt->max > 0); /* see throttle_is_valid() */
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extra = bkt->burst_level - burst_bucket_size;
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if (extra > 0) {
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return throttle_do_compute_wait(bkt->max, extra);
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}
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}
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return 0;
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}
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/* This function compute the time that must be waited while this IO
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*
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* @is_write: true if the current IO is a write, false if it's a read
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* @ret: time to wait
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*/
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static int64_t throttle_compute_wait_for(ThrottleState *ts,
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bool is_write)
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{
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BucketType to_check[2][4] = { {THROTTLE_BPS_TOTAL,
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THROTTLE_OPS_TOTAL,
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THROTTLE_BPS_READ,
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THROTTLE_OPS_READ},
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{THROTTLE_BPS_TOTAL,
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THROTTLE_OPS_TOTAL,
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THROTTLE_BPS_WRITE,
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THROTTLE_OPS_WRITE}, };
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int64_t wait, max_wait = 0;
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int i;
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for (i = 0; i < 4; i++) {
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BucketType index = to_check[is_write][i];
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wait = throttle_compute_wait(&ts->cfg.buckets[index]);
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if (wait > max_wait) {
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max_wait = wait;
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}
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}
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return max_wait;
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}
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/* compute the timer for this type of operation
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*
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* @is_write: the type of operation
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* @now: the current clock timestamp
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* @next_timestamp: the resulting timer
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* @ret: true if a timer must be set
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*/
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static bool throttle_compute_timer(ThrottleState *ts,
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bool is_write,
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int64_t now,
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int64_t *next_timestamp)
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{
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int64_t wait;
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/* leak proportionally to the time elapsed */
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throttle_do_leak(ts, now);
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/* compute the wait time if any */
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wait = throttle_compute_wait_for(ts, is_write);
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/* if the code must wait compute when the next timer should fire */
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if (wait) {
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*next_timestamp = now + wait;
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return true;
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}
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/* else no need to wait at all */
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*next_timestamp = now;
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return false;
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}
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/* Add timers to event loop */
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void throttle_timers_attach_aio_context(ThrottleTimers *tt,
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AioContext *new_context)
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{
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tt->timers[0] = aio_timer_new(new_context, tt->clock_type, SCALE_NS,
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tt->read_timer_cb, tt->timer_opaque);
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tt->timers[1] = aio_timer_new(new_context, tt->clock_type, SCALE_NS,
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tt->write_timer_cb, tt->timer_opaque);
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}
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/*
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* Initialize the ThrottleConfig structure to a valid state
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* @cfg: the config to initialize
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*/
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void throttle_config_init(ThrottleConfig *cfg)
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{
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unsigned i;
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memset(cfg, 0, sizeof(*cfg));
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for (i = 0; i < BUCKETS_COUNT; i++) {
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cfg->buckets[i].burst_length = 1;
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}
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}
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/* To be called first on the ThrottleState */
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void throttle_init(ThrottleState *ts)
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{
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memset(ts, 0, sizeof(ThrottleState));
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throttle_config_init(&ts->cfg);
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}
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/* To be called first on the ThrottleTimers */
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void throttle_timers_init(ThrottleTimers *tt,
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AioContext *aio_context,
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QEMUClockType clock_type,
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QEMUTimerCB *read_timer_cb,
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QEMUTimerCB *write_timer_cb,
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void *timer_opaque)
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{
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memset(tt, 0, sizeof(ThrottleTimers));
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tt->clock_type = clock_type;
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tt->read_timer_cb = read_timer_cb;
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tt->write_timer_cb = write_timer_cb;
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tt->timer_opaque = timer_opaque;
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throttle_timers_attach_aio_context(tt, aio_context);
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}
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/* destroy a timer */
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static void throttle_timer_destroy(QEMUTimer **timer)
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{
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assert(*timer != NULL);
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timer_del(*timer);
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timer_free(*timer);
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*timer = NULL;
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}
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/* Remove timers from event loop */
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void throttle_timers_detach_aio_context(ThrottleTimers *tt)
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{
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int i;
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for (i = 0; i < 2; i++) {
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throttle_timer_destroy(&tt->timers[i]);
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}
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}
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/* To be called last on the ThrottleTimers */
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void throttle_timers_destroy(ThrottleTimers *tt)
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{
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throttle_timers_detach_aio_context(tt);
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}
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/* is any throttling timer configured */
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bool throttle_timers_are_initialized(ThrottleTimers *tt)
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{
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if (tt->timers[0]) {
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return true;
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}
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return false;
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}
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/* Does any throttling must be done
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*
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* @cfg: the throttling configuration to inspect
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* @ret: true if throttling must be done else false
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*/
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bool throttle_enabled(ThrottleConfig *cfg)
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{
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int i;
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for (i = 0; i < BUCKETS_COUNT; i++) {
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if (cfg->buckets[i].avg > 0) {
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return true;
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}
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}
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return false;
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}
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/* check if a throttling configuration is valid
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* @cfg: the throttling configuration to inspect
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* @ret: true if valid else false
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* @errp: error object
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*/
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bool throttle_is_valid(ThrottleConfig *cfg, Error **errp)
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{
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int i;
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bool bps_flag, ops_flag;
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bool bps_max_flag, ops_max_flag;
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bps_flag = cfg->buckets[THROTTLE_BPS_TOTAL].avg &&
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(cfg->buckets[THROTTLE_BPS_READ].avg ||
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cfg->buckets[THROTTLE_BPS_WRITE].avg);
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ops_flag = cfg->buckets[THROTTLE_OPS_TOTAL].avg &&
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(cfg->buckets[THROTTLE_OPS_READ].avg ||
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cfg->buckets[THROTTLE_OPS_WRITE].avg);
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bps_max_flag = cfg->buckets[THROTTLE_BPS_TOTAL].max &&
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(cfg->buckets[THROTTLE_BPS_READ].max ||
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cfg->buckets[THROTTLE_BPS_WRITE].max);
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ops_max_flag = cfg->buckets[THROTTLE_OPS_TOTAL].max &&
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(cfg->buckets[THROTTLE_OPS_READ].max ||
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cfg->buckets[THROTTLE_OPS_WRITE].max);
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if (bps_flag || ops_flag || bps_max_flag || ops_max_flag) {
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error_setg(errp, "bps/iops/max total values and read/write values"
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" cannot be used at the same time");
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return false;
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}
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if (cfg->op_size &&
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!cfg->buckets[THROTTLE_OPS_TOTAL].avg &&
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!cfg->buckets[THROTTLE_OPS_READ].avg &&
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!cfg->buckets[THROTTLE_OPS_WRITE].avg) {
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error_setg(errp, "iops size requires an iops value to be set");
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return false;
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}
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for (i = 0; i < BUCKETS_COUNT; i++) {
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LeakyBucket *bkt = &cfg->buckets[i];
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if (bkt->avg > THROTTLE_VALUE_MAX || bkt->max > THROTTLE_VALUE_MAX) {
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error_setg(errp, "bps/iops/max values must be within [0, %lld]",
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THROTTLE_VALUE_MAX);
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return false;
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}
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if (!bkt->burst_length) {
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error_setg(errp, "the burst length cannot be 0");
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return false;
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}
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if (bkt->burst_length > 1 && !bkt->max) {
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error_setg(errp, "burst length set without burst rate");
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return false;
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}
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if (bkt->max && bkt->burst_length > THROTTLE_VALUE_MAX / bkt->max) {
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error_setg(errp, "burst length too high for this burst rate");
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return false;
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}
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if (bkt->max && !bkt->avg) {
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error_setg(errp, "bps_max/iops_max require corresponding"
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" bps/iops values");
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return false;
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}
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if (bkt->max && bkt->max < bkt->avg) {
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error_setg(errp, "bps_max/iops_max cannot be lower than bps/iops");
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return false;
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}
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}
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return true;
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}
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/* Used to configure the throttle
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*
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* @ts: the throttle state we are working on
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* @clock_type: the group's clock_type
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* @cfg: the config to set
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*/
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void throttle_config(ThrottleState *ts,
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QEMUClockType clock_type,
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ThrottleConfig *cfg)
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{
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int i;
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ts->cfg = *cfg;
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/* Zero bucket level */
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for (i = 0; i < BUCKETS_COUNT; i++) {
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ts->cfg.buckets[i].level = 0;
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ts->cfg.buckets[i].burst_level = 0;
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}
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ts->previous_leak = qemu_clock_get_ns(clock_type);
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}
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/* used to get config
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*
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* @ts: the throttle state we are working on
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* @cfg: the config to write
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*/
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void throttle_get_config(ThrottleState *ts, ThrottleConfig *cfg)
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{
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*cfg = ts->cfg;
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}
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/* Schedule the read or write timer if needed
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*
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* NOTE: this function is not unit tested due to it's usage of timer_mod
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*
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* @tt: the timers structure
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* @is_write: the type of operation (read/write)
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* @ret: true if the timer has been scheduled else false
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*/
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bool throttle_schedule_timer(ThrottleState *ts,
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ThrottleTimers *tt,
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bool is_write)
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{
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int64_t now = qemu_clock_get_ns(tt->clock_type);
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int64_t next_timestamp;
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bool must_wait;
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must_wait = throttle_compute_timer(ts,
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is_write,
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now,
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&next_timestamp);
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/* request not throttled */
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if (!must_wait) {
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return false;
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}
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/* request throttled and timer pending -> do nothing */
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if (timer_pending(tt->timers[is_write])) {
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return true;
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}
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/* request throttled and timer not pending -> arm timer */
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timer_mod(tt->timers[is_write], next_timestamp);
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return true;
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}
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/* do the accounting for this operation
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*
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* @is_write: the type of operation (read/write)
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* @size: the size of the operation
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*/
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void throttle_account(ThrottleState *ts, bool is_write, uint64_t size)
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{
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const BucketType bucket_types_size[2][2] = {
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{ THROTTLE_BPS_TOTAL, THROTTLE_BPS_READ },
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{ THROTTLE_BPS_TOTAL, THROTTLE_BPS_WRITE }
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};
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const BucketType bucket_types_units[2][2] = {
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{ THROTTLE_OPS_TOTAL, THROTTLE_OPS_READ },
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{ THROTTLE_OPS_TOTAL, THROTTLE_OPS_WRITE }
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};
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double units = 1.0;
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unsigned i;
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/* if cfg.op_size is defined and smaller than size we compute unit count */
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if (ts->cfg.op_size && size > ts->cfg.op_size) {
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units = (double) size / ts->cfg.op_size;
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}
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for (i = 0; i < 2; i++) {
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LeakyBucket *bkt;
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bkt = &ts->cfg.buckets[bucket_types_size[is_write][i]];
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bkt->level += size;
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if (bkt->burst_length > 1) {
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bkt->burst_level += size;
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}
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bkt = &ts->cfg.buckets[bucket_types_units[is_write][i]];
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bkt->level += units;
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if (bkt->burst_length > 1) {
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bkt->burst_level += units;
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}
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}
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}
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/* return a ThrottleConfig based on the options in a ThrottleLimits
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*
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* @arg: the ThrottleLimits object to read from
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* @cfg: the ThrottleConfig to edit
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* @errp: error object
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*/
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void throttle_limits_to_config(ThrottleLimits *arg, ThrottleConfig *cfg,
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Error **errp)
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{
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if (arg->has_bps_total) {
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cfg->buckets[THROTTLE_BPS_TOTAL].avg = arg->bps_total;
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}
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if (arg->has_bps_read) {
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cfg->buckets[THROTTLE_BPS_READ].avg = arg->bps_read;
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}
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if (arg->has_bps_write) {
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cfg->buckets[THROTTLE_BPS_WRITE].avg = arg->bps_write;
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}
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|
|
|
if (arg->has_iops_total) {
|
|
cfg->buckets[THROTTLE_OPS_TOTAL].avg = arg->iops_total;
|
|
}
|
|
if (arg->has_iops_read) {
|
|
cfg->buckets[THROTTLE_OPS_READ].avg = arg->iops_read;
|
|
}
|
|
if (arg->has_iops_write) {
|
|
cfg->buckets[THROTTLE_OPS_WRITE].avg = arg->iops_write;
|
|
}
|
|
|
|
if (arg->has_bps_total_max) {
|
|
cfg->buckets[THROTTLE_BPS_TOTAL].max = arg->bps_total_max;
|
|
}
|
|
if (arg->has_bps_read_max) {
|
|
cfg->buckets[THROTTLE_BPS_READ].max = arg->bps_read_max;
|
|
}
|
|
if (arg->has_bps_write_max) {
|
|
cfg->buckets[THROTTLE_BPS_WRITE].max = arg->bps_write_max;
|
|
}
|
|
if (arg->has_iops_total_max) {
|
|
cfg->buckets[THROTTLE_OPS_TOTAL].max = arg->iops_total_max;
|
|
}
|
|
if (arg->has_iops_read_max) {
|
|
cfg->buckets[THROTTLE_OPS_READ].max = arg->iops_read_max;
|
|
}
|
|
if (arg->has_iops_write_max) {
|
|
cfg->buckets[THROTTLE_OPS_WRITE].max = arg->iops_write_max;
|
|
}
|
|
|
|
if (arg->has_bps_total_max_length) {
|
|
if (arg->bps_total_max_length > UINT_MAX) {
|
|
error_setg(errp, "bps-total-max-length value must be in"
|
|
" the range [0, %u]", UINT_MAX);
|
|
return;
|
|
}
|
|
cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_total_max_length;
|
|
}
|
|
if (arg->has_bps_read_max_length) {
|
|
if (arg->bps_read_max_length > UINT_MAX) {
|
|
error_setg(errp, "bps-read-max-length value must be in"
|
|
" the range [0, %u]", UINT_MAX);
|
|
return;
|
|
}
|
|
cfg->buckets[THROTTLE_BPS_READ].burst_length = arg->bps_read_max_length;
|
|
}
|
|
if (arg->has_bps_write_max_length) {
|
|
if (arg->bps_write_max_length > UINT_MAX) {
|
|
error_setg(errp, "bps-write-max-length value must be in"
|
|
" the range [0, %u]", UINT_MAX);
|
|
return;
|
|
}
|
|
cfg->buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_write_max_length;
|
|
}
|
|
if (arg->has_iops_total_max_length) {
|
|
if (arg->iops_total_max_length > UINT_MAX) {
|
|
error_setg(errp, "iops-total-max-length value must be in"
|
|
" the range [0, %u]", UINT_MAX);
|
|
return;
|
|
}
|
|
cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_total_max_length;
|
|
}
|
|
if (arg->has_iops_read_max_length) {
|
|
if (arg->iops_read_max_length > UINT_MAX) {
|
|
error_setg(errp, "iops-read-max-length value must be in"
|
|
" the range [0, %u]", UINT_MAX);
|
|
return;
|
|
}
|
|
cfg->buckets[THROTTLE_OPS_READ].burst_length = arg->iops_read_max_length;
|
|
}
|
|
if (arg->has_iops_write_max_length) {
|
|
if (arg->iops_write_max_length > UINT_MAX) {
|
|
error_setg(errp, "iops-write-max-length value must be in"
|
|
" the range [0, %u]", UINT_MAX);
|
|
return;
|
|
}
|
|
cfg->buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_write_max_length;
|
|
}
|
|
|
|
if (arg->has_iops_size) {
|
|
cfg->op_size = arg->iops_size;
|
|
}
|
|
|
|
throttle_is_valid(cfg, errp);
|
|
}
|
|
|
|
/* write the options of a ThrottleConfig to a ThrottleLimits
|
|
*
|
|
* @cfg: the ThrottleConfig to read from
|
|
* @var: the ThrottleLimits to write to
|
|
*/
|
|
void throttle_config_to_limits(ThrottleConfig *cfg, ThrottleLimits *var)
|
|
{
|
|
var->bps_total = cfg->buckets[THROTTLE_BPS_TOTAL].avg;
|
|
var->bps_read = cfg->buckets[THROTTLE_BPS_READ].avg;
|
|
var->bps_write = cfg->buckets[THROTTLE_BPS_WRITE].avg;
|
|
var->iops_total = cfg->buckets[THROTTLE_OPS_TOTAL].avg;
|
|
var->iops_read = cfg->buckets[THROTTLE_OPS_READ].avg;
|
|
var->iops_write = cfg->buckets[THROTTLE_OPS_WRITE].avg;
|
|
var->bps_total_max = cfg->buckets[THROTTLE_BPS_TOTAL].max;
|
|
var->bps_read_max = cfg->buckets[THROTTLE_BPS_READ].max;
|
|
var->bps_write_max = cfg->buckets[THROTTLE_BPS_WRITE].max;
|
|
var->iops_total_max = cfg->buckets[THROTTLE_OPS_TOTAL].max;
|
|
var->iops_read_max = cfg->buckets[THROTTLE_OPS_READ].max;
|
|
var->iops_write_max = cfg->buckets[THROTTLE_OPS_WRITE].max;
|
|
var->bps_total_max_length = cfg->buckets[THROTTLE_BPS_TOTAL].burst_length;
|
|
var->bps_read_max_length = cfg->buckets[THROTTLE_BPS_READ].burst_length;
|
|
var->bps_write_max_length = cfg->buckets[THROTTLE_BPS_WRITE].burst_length;
|
|
var->iops_total_max_length = cfg->buckets[THROTTLE_OPS_TOTAL].burst_length;
|
|
var->iops_read_max_length = cfg->buckets[THROTTLE_OPS_READ].burst_length;
|
|
var->iops_write_max_length = cfg->buckets[THROTTLE_OPS_WRITE].burst_length;
|
|
var->iops_size = cfg->op_size;
|
|
|
|
var->has_bps_total = true;
|
|
var->has_bps_read = true;
|
|
var->has_bps_write = true;
|
|
var->has_iops_total = true;
|
|
var->has_iops_read = true;
|
|
var->has_iops_write = true;
|
|
var->has_bps_total_max = true;
|
|
var->has_bps_read_max = true;
|
|
var->has_bps_write_max = true;
|
|
var->has_iops_total_max = true;
|
|
var->has_iops_read_max = true;
|
|
var->has_iops_write_max = true;
|
|
var->has_bps_read_max_length = true;
|
|
var->has_bps_total_max_length = true;
|
|
var->has_bps_write_max_length = true;
|
|
var->has_iops_total_max_length = true;
|
|
var->has_iops_read_max_length = true;
|
|
var->has_iops_write_max_length = true;
|
|
var->has_iops_size = true;
|
|
}
|