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OpenZFS 8484 - Implement aggregate sum and use for arc counters

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In pursuit of improving performance on multi-core systems, we should
implements fanned out counters and use them to improve the performance of
some of the arc statistics. These stats are updated extremely frequently,
and can consume a significant amount of CPU time.

Authored by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Dan McDonald <danmcd@joyent.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: Paul Dagnelie <pcd@delphix.com>

OpenZFS-issue: https://www.illumos.org/issues/8484
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/7028a8b92b7
Issue #3752
Closes #7462
This commit is contained in:
Paul Dagnelie
2017-05-25 11:32:40 -07:00
committed by Brian Behlendorf
parent f0ed6c7448
commit 37fb3e4318
12 changed files with 589 additions and 85 deletions
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include/sys/aggsum.h
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/*
* CDDL HEADER START
*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2017 by Delphix. All rights reserved.
*/
#ifndef _SYS_AGGSUM_H
#define _SYS_AGGSUM_H
#include <sys/zfs_context.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct aggsum_bucket aggsum_bucket_t;
struct aggsum_bucket {
kmutex_t asc_lock;
int64_t asc_delta;
uint64_t asc_borrowed;
} ____cacheline_aligned;
/*
* Fan out over FANOUT cpus.
*/
typedef struct aggsum {
kmutex_t as_lock;
int64_t as_lower_bound;
int64_t as_upper_bound;
uint64_t as_numbuckets;
aggsum_bucket_t *as_buckets;
} aggsum_t;
void aggsum_init(aggsum_t *, uint64_t);
void aggsum_fini(aggsum_t *);
int64_t aggsum_lower_bound(aggsum_t *);
int64_t aggsum_upper_bound(aggsum_t *);
int aggsum_compare(aggsum_t *, uint64_t);
uint64_t aggsum_value(aggsum_t *);
void aggsum_add(aggsum_t *, int64_t);
#ifdef __cplusplus
}
#endif
#endif /* _SYS_AGGSUM_H */