022cdc9f40
This commit eliminates the 1:1 relationship between BlockBackend and throttle group state. Users will be able to create multiple throttle nodes, each with its own throttle group state, in the future. The throttle group state cannot be per-BlockBackend anymore, it must be per-throttle node. This is done by gathering ThrottleGroup membership details from BlockBackendPublic into ThrottleGroupMember and refactoring existing code to use the structure. Reviewed-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Manos Pitsidianakis <el13635@mail.ntua.gr> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
/*
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* QEMU block throttling group infrastructure
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*
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* Copyright (C) Nodalink, EURL. 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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#ifndef THROTTLE_GROUPS_H
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#define THROTTLE_GROUPS_H
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#include "qemu/throttle.h"
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#include "block/block_int.h"
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/* The ThrottleGroupMember structure indicates membership in a ThrottleGroup
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* and holds related data.
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*/
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typedef struct ThrottleGroupMember {
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/* throttled_reqs_lock protects the CoQueues for throttled requests. */
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CoMutex throttled_reqs_lock;
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CoQueue throttled_reqs[2];
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/* Nonzero if the I/O limits are currently being ignored; generally
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* it is zero. Accessed with atomic operations.
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*/
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unsigned int io_limits_disabled;
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/* The following fields are protected by the ThrottleGroup lock.
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* See the ThrottleGroup documentation for details.
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* throttle_state tells us if I/O limits are configured. */
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ThrottleState *throttle_state;
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ThrottleTimers throttle_timers;
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unsigned pending_reqs[2];
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QLIST_ENTRY(ThrottleGroupMember) round_robin;
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} ThrottleGroupMember;
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const char *throttle_group_get_name(ThrottleGroupMember *tgm);
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ThrottleState *throttle_group_incref(const char *name);
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void throttle_group_unref(ThrottleState *ts);
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void throttle_group_config(ThrottleGroupMember *tgm, ThrottleConfig *cfg);
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void throttle_group_get_config(ThrottleGroupMember *tgm, ThrottleConfig *cfg);
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void throttle_group_register_tgm(ThrottleGroupMember *tgm,
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const char *groupname);
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void throttle_group_unregister_tgm(ThrottleGroupMember *tgm);
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void throttle_group_restart_tgm(ThrottleGroupMember *tgm);
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void coroutine_fn throttle_group_co_io_limits_intercept(ThrottleGroupMember *tgm,
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unsigned int bytes,
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bool is_write);
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#endif
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