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Remove pool io kstats

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This mostly reverts "3537 want pool io kstats" commit of 8 years ago.

From one side this code using pool-wide locks became pretty bad for
performance, creating significant lock contention in I/O pipeline.
From another, there are more efficient ways now to obtain detailed
statistics, while this statistics is illumos-specific and much less
usable on Linux and FreeBSD, reported only via procfs/sysctls.

This commit does not remove KSTAT_TYPE_IO implementation, that may
be removed later together with already unused KSTAT_TYPE_INTR and
KSTAT_TYPE_TIMER.

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Sponsored-By: iXsystems, Inc.
Closes #12212
This commit is contained in:
Alexander Motin
2021-06-10 11:27:33 -04:00
committed by Brian Behlendorf
parent 2e158b0e0b
commit efdfb14fc8
10 changed files with 0 additions and 276 deletions
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include/sys/spa.h
-1
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@@ -916,7 +916,6 @@ typedef struct spa_stats {
spa_history_list_t read_history;
spa_history_list_t txg_history;
spa_history_kstat_t tx_assign_histogram;
spa_history_kstat_t io_history;
spa_history_list_t mmp_history;
spa_history_kstat_t state; /* pool state */
spa_history_kstat_t iostats;
include/sys/zfs_context.h
-6
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@@ -362,12 +362,6 @@ extern kstat_t *kstat_create(const char *, int,
const char *, const char *, uchar_t, ulong_t, uchar_t);
extern void kstat_install(kstat_t *);
extern void kstat_delete(kstat_t *);
extern void kstat_waitq_enter(kstat_io_t *);
extern void kstat_waitq_exit(kstat_io_t *);
extern void kstat_runq_enter(kstat_io_t *);
extern void kstat_runq_exit(kstat_io_t *);
extern void kstat_waitq_to_runq(kstat_io_t *);
extern void kstat_runq_back_to_waitq(kstat_io_t *);
extern void kstat_set_raw_ops(kstat_t *ksp,
int (*headers)(char *buf, size_t size),
int (*data)(char *buf, size_t size, void *data),