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/*
* Fsdev Throttle
*
* Copyright (C) 2016 Huawei Technologies Duesseldorf GmbH
*
* Author: Pradeep Jagadeesh <pradeep.jagadeesh@huawei.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* (at your option) any later version.
*
* See the COPYING file in the top-level directory for details.
*
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qemu-fsdev-throttle.h"
#include "qemu/iov.h"
#include "qemu/main-loop.h"
#include "qemu/option.h"
static void fsdev_throttle_read_timer_cb(void *opaque)
{
FsThrottle *fst = opaque;
qemu_co_enter_next(&fst->throttled_reqs[false], NULL);
}
static void fsdev_throttle_write_timer_cb(void *opaque)
{
FsThrottle *fst = opaque;
qemu_co_enter_next(&fst->throttled_reqs[true], NULL);
}
void fsdev_throttle_parse_opts(QemuOpts *opts, FsThrottle *fst, Error **errp)
{
throttle_config_init(&fst->cfg);
fst->cfg.buckets[THROTTLE_BPS_TOTAL].avg =
qemu_opt_get_number(opts, "throttling.bps-total", 0);
fst->cfg.buckets[THROTTLE_BPS_READ].avg =
qemu_opt_get_number(opts, "throttling.bps-read", 0);
fst->cfg.buckets[THROTTLE_BPS_WRITE].avg =
qemu_opt_get_number(opts, "throttling.bps-write", 0);
fst->cfg.buckets[THROTTLE_OPS_TOTAL].avg =
qemu_opt_get_number(opts, "throttling.iops-total", 0);
fst->cfg.buckets[THROTTLE_OPS_READ].avg =
qemu_opt_get_number(opts, "throttling.iops-read", 0);
fst->cfg.buckets[THROTTLE_OPS_WRITE].avg =
qemu_opt_get_number(opts, "throttling.iops-write", 0);
fst->cfg.buckets[THROTTLE_BPS_TOTAL].max =
qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
fst->cfg.buckets[THROTTLE_BPS_READ].max =
qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
fst->cfg.buckets[THROTTLE_BPS_WRITE].max =
qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
fst->cfg.buckets[THROTTLE_OPS_TOTAL].max =
qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
fst->cfg.buckets[THROTTLE_OPS_READ].max =
qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
fst->cfg.buckets[THROTTLE_OPS_WRITE].max =
qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
fst->cfg.buckets[THROTTLE_BPS_TOTAL].burst_length =
qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
fst->cfg.buckets[THROTTLE_BPS_READ].burst_length =
qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
fst->cfg.buckets[THROTTLE_BPS_WRITE].burst_length =
qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
fst->cfg.buckets[THROTTLE_OPS_TOTAL].burst_length =
qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
fst->cfg.buckets[THROTTLE_OPS_READ].burst_length =
qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
fst->cfg.buckets[THROTTLE_OPS_WRITE].burst_length =
qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
fst->cfg.op_size =
qemu_opt_get_number(opts, "throttling.iops-size", 0);
throttle_is_valid(&fst->cfg, errp);
}
void fsdev_throttle_init(FsThrottle *fst)
{
if (throttle_enabled(&fst->cfg)) {
throttle_init(&fst->ts);
throttle_timers_init(&fst->tt,
qemu_get_aio_context(),
QEMU_CLOCK_REALTIME,
fsdev_throttle_read_timer_cb,
fsdev_throttle_write_timer_cb,
fst);
throttle_config(&fst->ts, QEMU_CLOCK_REALTIME, &fst->cfg);
qemu_co_queue_init(&fst->throttled_reqs[0]);
qemu_co_queue_init(&fst->throttled_reqs[1]);
}
}
void coroutine_fn fsdev_co_throttle_request(FsThrottle *fst, bool is_write,
struct iovec *iov, int iovcnt)
{
if (throttle_enabled(&fst->cfg)) {
if (throttle_schedule_timer(&fst->ts, &fst->tt, is_write) ||
!qemu_co_queue_empty(&fst->throttled_reqs[is_write])) {
qemu_co_queue_wait(&fst->throttled_reqs[is_write], NULL);
}
throttle_account(&fst->ts, is_write, iov_size(iov, iovcnt));
if (!qemu_co_queue_empty(&fst->throttled_reqs[is_write]) &&
!throttle_schedule_timer(&fst->ts, &fst->tt, is_write)) {
qemu_co_queue_next(&fst->throttled_reqs[is_write]);
}
}
}
void fsdev_throttle_cleanup(FsThrottle *fst)
{
if (throttle_enabled(&fst->cfg)) {
throttle_timers_destroy(&fst->tt);
}
}
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