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4f07282786
Duplicate io and checksum ereport events can misrepresent that things are worse than they seem. Ideally the zpool events and the corresponding vdev stat error counts in a zpool status should be for unique errors -- not the same error being counted over and over. This can be demonstrated in a simple example. With a single bad block in a datafile and just 5 reads of the file we end up with a degraded vdev, even though there is only one unique error in the pool. The proposed solution to the above issue, is to eliminate duplicates when posting events and when updating vdev error stats. We now save recent error events of interest when posting events so that we can easily check for duplicates when posting an error. Reviewed by: Brad Lewis <brad.lewis@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Don Brady <don.brady@delphix.com> Closes #10861
122 lines
3.7 KiB
C
122 lines
3.7 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 (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
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*/
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#ifndef _SYS_FM_UTIL_H
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#define _SYS_FM_UTIL_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <sys/nvpair.h>
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/*
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* Shared user/kernel definitions for class length, error channel name,
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* and kernel event publisher string.
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*/
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#define FM_MAX_CLASS 100
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#define FM_ERROR_CHAN "com.sun:fm:error"
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#define FM_PUB "fm"
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/*
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* ereport dump device transport support
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*
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* Ereports are written out to the dump device at a proscribed offset from the
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* end, similar to in-transit log messages. The ereports are represented as a
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* erpt_dump_t header followed by ed_size bytes of packed native nvlist data.
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*
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* NOTE: All of these constants and the header must be defined so they have the
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* same representation for *both* 32-bit and 64-bit producers and consumers.
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*/
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#define ERPT_MAGIC 0xf00d4eddU
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#define ERPT_MAX_ERRS 16
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#define ERPT_DATA_SZ (6 * 1024)
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#define ERPT_EVCH_MAX 256
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#define ERPT_HIWAT 64
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typedef struct erpt_dump {
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uint32_t ed_magic; /* ERPT_MAGIC or zero to indicate end */
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uint32_t ed_chksum; /* checksum32() of packed nvlist data */
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uint32_t ed_size; /* ereport (nvl) fixed buf size */
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uint32_t ed_pad; /* reserved for future use */
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hrtime_t ed_hrt_nsec; /* hrtime of this ereport */
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hrtime_t ed_hrt_base; /* hrtime sample corresponding to ed_tod_base */
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struct {
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uint64_t sec; /* seconds since gettimeofday() Epoch */
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uint64_t nsec; /* nanoseconds past ed_tod_base.sec */
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} ed_tod_base;
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} erpt_dump_t;
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#ifdef _KERNEL
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#define ZEVENT_SHUTDOWN 0x1
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typedef void zevent_cb_t(nvlist_t *, nvlist_t *);
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typedef struct zevent_s {
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nvlist_t *ev_nvl; /* protected by the zevent_lock */
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nvlist_t *ev_detector; /* " */
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list_t ev_ze_list; /* " */
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list_node_t ev_node; /* " */
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zevent_cb_t *ev_cb; /* " */
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uint64_t ev_eid;
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} zevent_t;
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typedef struct zfs_zevent {
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zevent_t *ze_zevent; /* protected by the zevent_lock */
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list_node_t ze_node; /* " */
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uint64_t ze_dropped; /* " */
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} zfs_zevent_t;
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extern void fm_init(void);
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extern void fm_fini(void);
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extern void fm_nvprint(nvlist_t *);
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extern void zfs_zevent_post_cb(nvlist_t *nvl, nvlist_t *detector);
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extern int zfs_zevent_post(nvlist_t *, nvlist_t *, zevent_cb_t *);
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extern void zfs_zevent_drain_all(int *);
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extern int zfs_zevent_fd_hold(int, minor_t *, zfs_zevent_t **);
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extern void zfs_zevent_fd_rele(int);
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extern int zfs_zevent_next(zfs_zevent_t *, nvlist_t **, uint64_t *, uint64_t *);
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extern int zfs_zevent_wait(zfs_zevent_t *);
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extern int zfs_zevent_seek(zfs_zevent_t *, uint64_t);
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extern void zfs_zevent_init(zfs_zevent_t **);
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extern void zfs_zevent_destroy(zfs_zevent_t *);
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extern void zfs_zevent_track_duplicate(void);
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extern void zfs_ereport_init(void);
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extern void zfs_ereport_fini(void);
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#else
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static inline void fm_init(void) { }
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static inline void fm_fini(void) { }
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#endif /* _KERNEL */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_FM_UTIL_H */
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