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8d82a19def
Our zfs backed Lustre MDT had soft lockups while under heavy metadata workloads while handling transaction callbacks from osd_zfs. The problem is zfs is not taking advantage of the fast path in Lustre's trans callback handling, where Lustre will skip the calls to ptlrpc_commit_replies() when it already saw a higher transaction number. This patch corrects this, it also has a positive impact on metadata performance on Lustre with osd_zfs, plus some cleanup in the headers. A similar issue for ext4/ldiskfs is described on: https://jira.hpdd.intel.com/browse/LU-6527 Reviewed-by: Olaf Faaland <faaland1@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Li Dongyang <dongyang.li@anu.edu.au> Closes #6986
177 lines
4.4 KiB
C
177 lines
4.4 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2012, 2016 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_DMU_TX_H
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#define _SYS_DMU_TX_H
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#include <sys/inttypes.h>
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#include <sys/dmu.h>
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#include <sys/txg.h>
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#include <sys/refcount.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct dmu_buf_impl;
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struct dmu_tx_hold;
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struct dnode_link;
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struct dsl_pool;
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struct dnode;
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struct dsl_dir;
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struct dmu_tx {
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/*
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* No synchronization is needed because a tx can only be handled
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* by one thread.
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*/
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list_t tx_holds; /* list of dmu_tx_hold_t */
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objset_t *tx_objset;
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struct dsl_dir *tx_dir;
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struct dsl_pool *tx_pool;
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uint64_t tx_txg;
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uint64_t tx_lastsnap_txg;
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uint64_t tx_lasttried_txg;
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txg_handle_t tx_txgh;
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void *tx_tempreserve_cookie;
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struct dmu_tx_hold *tx_needassign_txh;
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/* list of dmu_tx_callback_t on this dmu_tx */
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list_t tx_callbacks;
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/* placeholder for syncing context, doesn't need specific holds */
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boolean_t tx_anyobj;
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/* has this transaction already been delayed? */
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boolean_t tx_waited;
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/* transaction is marked as being a "net free" of space */
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boolean_t tx_netfree;
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/* time this transaction was created */
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hrtime_t tx_start;
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/* need to wait for sufficient dirty space */
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boolean_t tx_wait_dirty;
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int tx_err;
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};
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enum dmu_tx_hold_type {
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THT_NEWOBJECT,
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THT_WRITE,
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THT_BONUS,
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THT_FREE,
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THT_ZAP,
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THT_SPACE,
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THT_SPILL,
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THT_NUMTYPES
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};
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typedef struct dmu_tx_hold {
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dmu_tx_t *txh_tx;
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list_node_t txh_node;
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struct dnode *txh_dnode;
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refcount_t txh_space_towrite;
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refcount_t txh_memory_tohold;
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enum dmu_tx_hold_type txh_type;
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uint64_t txh_arg1;
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uint64_t txh_arg2;
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} dmu_tx_hold_t;
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typedef struct dmu_tx_callback {
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list_node_t dcb_node; /* linked to tx_callbacks list */
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dmu_tx_callback_func_t *dcb_func; /* caller function pointer */
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void *dcb_data; /* caller private data */
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} dmu_tx_callback_t;
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/*
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* Used for dmu tx kstat.
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*/
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typedef struct dmu_tx_stats {
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kstat_named_t dmu_tx_assigned;
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kstat_named_t dmu_tx_delay;
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kstat_named_t dmu_tx_error;
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kstat_named_t dmu_tx_suspended;
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kstat_named_t dmu_tx_group;
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kstat_named_t dmu_tx_memory_reserve;
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kstat_named_t dmu_tx_memory_reclaim;
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kstat_named_t dmu_tx_dirty_throttle;
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kstat_named_t dmu_tx_dirty_delay;
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kstat_named_t dmu_tx_dirty_over_max;
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kstat_named_t dmu_tx_quota;
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} dmu_tx_stats_t;
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extern dmu_tx_stats_t dmu_tx_stats;
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#define DMU_TX_STAT_INCR(stat, val) \
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atomic_add_64(&dmu_tx_stats.stat.value.ui64, (val));
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#define DMU_TX_STAT_BUMP(stat) \
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DMU_TX_STAT_INCR(stat, 1);
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/*
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* These routines are defined in dmu.h, and are called by the user.
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*/
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dmu_tx_t *dmu_tx_create(objset_t *dd);
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int dmu_tx_assign(dmu_tx_t *tx, txg_how_t txg_how);
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void dmu_tx_commit(dmu_tx_t *tx);
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void dmu_tx_abort(dmu_tx_t *tx);
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uint64_t dmu_tx_get_txg(dmu_tx_t *tx);
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struct dsl_pool *dmu_tx_pool(dmu_tx_t *tx);
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void dmu_tx_wait(dmu_tx_t *tx);
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/*
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* These routines are defined in dmu_spa.h, and are called by the SPA.
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*/
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extern dmu_tx_t *dmu_tx_create_assigned(struct dsl_pool *dp, uint64_t txg);
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/*
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* These routines are only called by the DMU.
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*/
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dmu_tx_t *dmu_tx_create_dd(dsl_dir_t *dd);
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int dmu_tx_is_syncing(dmu_tx_t *tx);
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int dmu_tx_private_ok(dmu_tx_t *tx);
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void dmu_tx_add_new_object(dmu_tx_t *tx, dnode_t *dn);
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void dmu_tx_dirty_buf(dmu_tx_t *tx, struct dmu_buf_impl *db);
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void dmu_tx_hold_space(dmu_tx_t *tx, uint64_t space);
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#ifdef ZFS_DEBUG
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#define DMU_TX_DIRTY_BUF(tx, db) dmu_tx_dirty_buf(tx, db)
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#else
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#define DMU_TX_DIRTY_BUF(tx, db)
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#endif
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void dmu_tx_init(void);
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void dmu_tx_fini(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_DMU_TX_H */
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