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Cache ddt_get_dedup_dspace() value if there was no ddt changes

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Save and reuse ddt dspace calculation when there have been no ddt changes.
This avoids unnecessary traversal of 168KiB of ddt histograms.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Gvozden Neskovic <neskovic@gmail.com>
Closes #5425
This commit is contained in:
Gvozden Neskovic
2016-12-03 00:59:35 +01:00
committed by Brian Behlendorf
parent baf67d15a5
commit e8a2014436
3 changed files with 15 additions and 2 deletions
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include/sys/spa_impl.h
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@@ -239,6 +239,7 @@ struct spa {
uint64_t spa_autoexpand; /* lun expansion on/off */
ddt_t *spa_ddt[ZIO_CHECKSUM_FUNCTIONS]; /* in-core DDTs */
uint64_t spa_ddt_stat_object; /* DDT statistics */
uint64_t spa_dedup_dspace; /* Cache get_dedup_dspace() */
uint64_t spa_dedup_ditto; /* dedup ditto threshold */
uint64_t spa_dedup_checksum; /* default dedup checksum */
uint64_t spa_dspace; /* dspace in normal class */