ea52cdd443
It is more convenient to use the return value of the function to notify errors, rather than to be tied up setting up the &local_err boilerplate. Signed-off-by: Greg Kurz <groug@kaod.org>
121 lines
4.5 KiB
C
121 lines
4.5 KiB
C
/*
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* Fsdev Throttle
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*
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* Copyright (C) 2016 Huawei Technologies Duesseldorf GmbH
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*
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* Author: Pradeep Jagadeesh <pradeep.jagadeesh@huawei.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* (at your option) any later version.
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*
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* See the COPYING file in the top-level directory for details.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu/error-report.h"
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#include "qemu-fsdev-throttle.h"
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#include "qemu/iov.h"
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#include "qemu/main-loop.h"
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#include "qemu/option.h"
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static void fsdev_throttle_read_timer_cb(void *opaque)
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{
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FsThrottle *fst = opaque;
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qemu_co_enter_next(&fst->throttled_reqs[false], NULL);
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}
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static void fsdev_throttle_write_timer_cb(void *opaque)
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{
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FsThrottle *fst = opaque;
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qemu_co_enter_next(&fst->throttled_reqs[true], NULL);
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}
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int fsdev_throttle_parse_opts(QemuOpts *opts, FsThrottle *fst, Error **errp)
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{
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throttle_config_init(&fst->cfg);
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fst->cfg.buckets[THROTTLE_BPS_TOTAL].avg =
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qemu_opt_get_number(opts, "throttling.bps-total", 0);
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fst->cfg.buckets[THROTTLE_BPS_READ].avg =
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qemu_opt_get_number(opts, "throttling.bps-read", 0);
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fst->cfg.buckets[THROTTLE_BPS_WRITE].avg =
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qemu_opt_get_number(opts, "throttling.bps-write", 0);
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fst->cfg.buckets[THROTTLE_OPS_TOTAL].avg =
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qemu_opt_get_number(opts, "throttling.iops-total", 0);
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fst->cfg.buckets[THROTTLE_OPS_READ].avg =
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qemu_opt_get_number(opts, "throttling.iops-read", 0);
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fst->cfg.buckets[THROTTLE_OPS_WRITE].avg =
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qemu_opt_get_number(opts, "throttling.iops-write", 0);
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fst->cfg.buckets[THROTTLE_BPS_TOTAL].max =
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qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
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fst->cfg.buckets[THROTTLE_BPS_READ].max =
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qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
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fst->cfg.buckets[THROTTLE_BPS_WRITE].max =
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qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
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fst->cfg.buckets[THROTTLE_OPS_TOTAL].max =
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qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
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fst->cfg.buckets[THROTTLE_OPS_READ].max =
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qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
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fst->cfg.buckets[THROTTLE_OPS_WRITE].max =
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qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
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fst->cfg.buckets[THROTTLE_BPS_TOTAL].burst_length =
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qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
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fst->cfg.buckets[THROTTLE_BPS_READ].burst_length =
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qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
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fst->cfg.buckets[THROTTLE_BPS_WRITE].burst_length =
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qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
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fst->cfg.buckets[THROTTLE_OPS_TOTAL].burst_length =
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qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
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fst->cfg.buckets[THROTTLE_OPS_READ].burst_length =
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qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
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fst->cfg.buckets[THROTTLE_OPS_WRITE].burst_length =
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qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
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fst->cfg.op_size =
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qemu_opt_get_number(opts, "throttling.iops-size", 0);
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return throttle_is_valid(&fst->cfg, errp) ? 0 : -1;
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}
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void fsdev_throttle_init(FsThrottle *fst)
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{
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if (throttle_enabled(&fst->cfg)) {
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throttle_init(&fst->ts);
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throttle_timers_init(&fst->tt,
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qemu_get_aio_context(),
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QEMU_CLOCK_REALTIME,
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fsdev_throttle_read_timer_cb,
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fsdev_throttle_write_timer_cb,
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fst);
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throttle_config(&fst->ts, QEMU_CLOCK_REALTIME, &fst->cfg);
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qemu_co_queue_init(&fst->throttled_reqs[0]);
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qemu_co_queue_init(&fst->throttled_reqs[1]);
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}
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}
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void coroutine_fn fsdev_co_throttle_request(FsThrottle *fst, bool is_write,
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struct iovec *iov, int iovcnt)
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{
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if (throttle_enabled(&fst->cfg)) {
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if (throttle_schedule_timer(&fst->ts, &fst->tt, is_write) ||
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!qemu_co_queue_empty(&fst->throttled_reqs[is_write])) {
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qemu_co_queue_wait(&fst->throttled_reqs[is_write], NULL);
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}
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throttle_account(&fst->ts, is_write, iov_size(iov, iovcnt));
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if (!qemu_co_queue_empty(&fst->throttled_reqs[is_write]) &&
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!throttle_schedule_timer(&fst->ts, &fst->tt, is_write)) {
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qemu_co_queue_next(&fst->throttled_reqs[is_write]);
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}
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}
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}
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void fsdev_throttle_cleanup(FsThrottle *fst)
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{
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if (throttle_enabled(&fst->cfg)) {
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throttle_timers_destroy(&fst->tt);
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}
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}
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