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2644784f49
After an MMP write completes, update the relevant mmp_history entry with the time between submission and completion, and the error status of the write. [faaland1@toss3a zfs]$ cat /proc/spl/kstat/zfs/pool/multihost 39 0 0x01 100 8800 69147946270893 72723903122926 id txg timestamp error duration mmp_delay vdev_guid 10607 1166 1518985089 0 138301 637785455 4882... 10608 1166 1518985089 0 136154 635407747 1151... 10609 1166 1518985089 0 803618560 633048078 9740... 10610 1166 1518985090 0 144826 633048078 4882... 10611 1166 1518985090 0 164527 666187671 1151... Where duration = gethrtime_in_done_fn - gethrtime_at_submission, and error = zio->io_error. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7190
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/*
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* CDDL HEADER START
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*
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* This file and its contents are supplied under the terms of the
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* Common Development and Distribution License ("CDDL"), version 1.0.
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* You may only use this file in accordance with the terms of version
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* 1.0 of the CDDL.
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*
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* A full copy of the text of the CDDL should have accompanied this
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* source. A copy of the CDDL is also available via the Internet at
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* http://www.illumos.org/license/CDDL.
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (C) 2017 by Lawrence Livermore National Security, LLC.
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*/
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#ifndef _SYS_MMP_H
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#define _SYS_MMP_H
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#include <sys/spa.h>
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#include <sys/zfs_context.h>
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#include <sys/uberblock_impl.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define MMP_MIN_INTERVAL 100 /* ms */
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#define MMP_DEFAULT_INTERVAL 1000 /* ms */
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#define MMP_DEFAULT_IMPORT_INTERVALS 10
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#define MMP_DEFAULT_FAIL_INTERVALS 5
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typedef struct mmp_thread {
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kmutex_t mmp_thread_lock; /* protect thread mgmt fields */
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kcondvar_t mmp_thread_cv;
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kthread_t *mmp_thread;
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uint8_t mmp_thread_exiting;
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kmutex_t mmp_io_lock; /* protect below */
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hrtime_t mmp_last_write; /* last successful MMP write */
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uint64_t mmp_delay; /* decaying avg ns between MMP writes */
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uberblock_t mmp_ub; /* last ub written by sync */
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zio_t *mmp_zio_root; /* root of mmp write zios */
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uint64_t mmp_kstat_id; /* unique id for next MMP write kstat */
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} mmp_thread_t;
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extern void mmp_init(struct spa *spa);
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extern void mmp_fini(struct spa *spa);
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extern void mmp_thread_start(struct spa *spa);
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extern void mmp_thread_stop(struct spa *spa);
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extern void mmp_update_uberblock(struct spa *spa, struct uberblock *ub);
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extern void mmp_signal_all_threads(void);
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/* Global tuning */
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extern ulong_t zfs_multihost_interval;
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extern uint_t zfs_multihost_fail_intervals;
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extern uint_t zfs_multihost_import_intervals;
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_MMP_H */
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