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More aggsum optimizations

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- Avoid atomic_add() when updating as_lower_bound/as_upper_bound.
Previous code was excessively strong on 64bit systems while not
strong enough on 32bit ones.  Instead introduce and use real
atomic_load() and atomic_store() operations, just an assignments
on 64bit machines, but using proper atomics on 32bit ones to avoid
torn reads/writes.

 - Reduce number of buckets on large systems.  Extra buckets not as
much improve add speed, as hurt reads.  Unlike wmsum for aggsum
reads are still important.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Sponsored-By: iXsystems, Inc.
Closes #12145
This commit is contained in:
Alexander Motin
2021-06-07 12:02:47 -04:00
committed by GitHub
parent e5e76bd643
commit ea400129c3
5 changed files with 129 additions and 63 deletions
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include/sys/aggsum.h
+4 -3
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@@ -39,15 +39,16 @@ struct aggsum_bucket {
typedef struct aggsum {
kmutex_t as_lock;
int64_t as_lower_bound;
int64_t as_upper_bound;
uint64_t as_upper_bound;
aggsum_bucket_t *as_buckets ____cacheline_aligned;
uint_t as_numbuckets;
aggsum_bucket_t *as_buckets;
uint_t as_bucketshift;
} 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 *);
uint64_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);