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Diffstat (limited to 'include/sys/txg_impl.h')
| -rw-r--r-- | include/sys/txg_impl.h | 125 |
1 files changed, 0 insertions, 125 deletions
diff --git a/include/sys/txg_impl.h b/include/sys/txg_impl.h deleted file mode 100644 index 9ca1de0330bf..000000000000 --- a/include/sys/txg_impl.h +++ /dev/null @@ -1,125 +0,0 @@ -// SPDX-License-Identifier: CDDL-1.0 -/* - * CDDL HEADER START - * - * The contents of this file are subject to the terms of the - * Common Development and Distribution License (the "License"). - * You may not use this file except in compliance with the License. - * - * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE - * or https://opensource.org/licenses/CDDL-1.0. - * See the License for the specific language governing permissions - * and limitations under the License. - * - * When distributing Covered Code, include this CDDL HEADER in each - * file and include the License file at usr/src/OPENSOLARIS.LICENSE. - * If applicable, add the following below this CDDL HEADER, with the - * fields enclosed by brackets "[]" replaced with your own identifying - * information: Portions Copyright [yyyy] [name of copyright owner] - * - * CDDL HEADER END - */ - -/* - * Copyright 2009 Sun Microsystems, Inc. All rights reserved. - * Use is subject to license terms. - */ - -/* - * Copyright (c) 2013, 2017 by Delphix. All rights reserved. - */ - -#ifndef _SYS_TXG_IMPL_H -#define _SYS_TXG_IMPL_H - -#include <sys/spa.h> -#include <sys/txg.h> - -#ifdef __cplusplus -extern "C" { -#endif - -/* - * The tx_cpu structure is a per-cpu structure that is used to track - * the number of active transaction holds (tc_count). As transactions - * are assigned into a transaction group the appropriate tc_count is - * incremented to indicate that there are pending changes that have yet - * to quiesce. Consumers eventually call txg_rele_to_sync() to decrement - * the tc_count. A transaction group is not considered quiesced until all - * tx_cpu structures have reached a tc_count of zero. - * - * This structure is a per-cpu structure by design. Updates to this structure - * are frequent and concurrent. Having a single structure would result in - * heavy lock contention so a per-cpu design was implemented. With the fanned - * out mutex design, consumers only need to lock the mutex associated with - * thread's cpu. - * - * The tx_cpu contains two locks, the tc_lock and tc_open_lock. - * The tc_lock is used to protect all members of the tx_cpu structure with - * the exception of the tc_open_lock. This lock should only be held for a - * short period of time, typically when updating the value of tc_count. - * - * The tc_open_lock protects the tx_open_txg member of the tx_state structure. - * This lock is used to ensure that transactions are only assigned into - * the current open transaction group. In order to move the current open - * transaction group to the quiesce phase, the txg_quiesce thread must - * grab all tc_open_locks, increment the tx_open_txg, and drop the locks. - * The tc_open_lock is held until the transaction is assigned into the - * transaction group. Typically, this is a short operation but if throttling - * is occurring it may be held for longer periods of time. - */ -struct tx_cpu { - kmutex_t tc_open_lock; /* protects tx_open_txg */ - kmutex_t tc_lock; /* protects the rest of this struct */ - kcondvar_t tc_cv[TXG_SIZE]; - uint64_t tc_count[TXG_SIZE]; /* tx hold count on each txg */ - list_t tc_callbacks[TXG_SIZE]; /* commit cb list */ -} ____cacheline_aligned; - -/* - * The tx_state structure maintains the state information about the different - * stages of the pool's transaction groups. A per pool tx_state structure - * is used to track this information. The tx_state structure also points to - * an array of tx_cpu structures (described above). Although the tx_sync_lock - * is used to protect the members of this structure, it is not used to - * protect the tx_open_txg. Instead a special lock in the tx_cpu structure - * is used. Readers of tx_open_txg must grab the per-cpu tc_open_lock. - * Any thread wishing to update tx_open_txg must grab the tc_open_lock on - * every cpu (see txg_quiesce()). - */ -typedef struct tx_state { - tx_cpu_t *tx_cpu; /* protects access to tx_open_txg */ - kmutex_t tx_sync_lock; /* protects the rest of this struct */ - - uint64_t tx_open_txg; /* currently open txg id */ - uint64_t tx_quiescing_txg; /* currently quiescing txg id */ - uint64_t tx_quiesced_txg; /* quiesced txg waiting for sync */ - uint64_t tx_syncing_txg; /* currently syncing txg id */ - uint64_t tx_synced_txg; /* last synced txg id */ - - hrtime_t tx_open_time; /* start time of tx_open_txg */ - - uint64_t tx_sync_txg_waiting; /* txg we're waiting to sync */ - uint64_t tx_quiesce_txg_waiting; /* txg we're waiting to open */ - - kcondvar_t tx_sync_more_cv; - kcondvar_t tx_sync_done_cv; - kcondvar_t tx_quiesce_more_cv; - kcondvar_t tx_quiesce_done_cv; - kcondvar_t tx_timeout_cv; - kcondvar_t tx_exit_cv; /* wait for all threads to exit */ - - uint8_t tx_threads; /* number of threads */ - uint8_t tx_exiting; /* set when we're exiting */ - - kthread_t *tx_sync_thread; - kthread_t *tx_quiesce_thread; - - taskq_t *tx_commit_cb_taskq; /* commit callback taskq */ -} tx_state_t; - -#ifdef __cplusplus -} -#endif - -#endif /* _SYS_TXG_IMPL_H */ |