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DDT: Switch to using wmsums for lookup stats

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ddt_lookup() is a very busy code under a highly congested global
lock.  Anything we can save here is very important.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes #17980
This commit is contained in:
Alexander Motin
2025-12-01 13:36:31 -05:00
committed by Brian Behlendorf
parent 2aad3dee23
commit a785ddc5f3
2 changed files with 99 additions and 8 deletions
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include/sys/ddt.h
+15
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@@ -33,6 +33,7 @@
#include <sys/fs/zfs.h>
#include <sys/zio.h>
#include <sys/dmu.h>
#include <sys/wmsum.h>
#ifdef __cplusplus
extern "C" {
@@ -296,6 +297,20 @@ typedef struct {
kstat_t *ddt_ksp; /* kstats context */
/* wmsums for hot-path lookup counters */
wmsum_t ddt_kstat_dds_lookup;
wmsum_t ddt_kstat_dds_lookup_live_hit;
wmsum_t ddt_kstat_dds_lookup_live_wait;
wmsum_t ddt_kstat_dds_lookup_live_miss;
wmsum_t ddt_kstat_dds_lookup_existing;
wmsum_t ddt_kstat_dds_lookup_new;
wmsum_t ddt_kstat_dds_lookup_log_hit;
wmsum_t ddt_kstat_dds_lookup_log_active_hit;
wmsum_t ddt_kstat_dds_lookup_log_flushing_hit;
wmsum_t ddt_kstat_dds_lookup_log_miss;
wmsum_t ddt_kstat_dds_lookup_stored_hit;
wmsum_t ddt_kstat_dds_lookup_stored_miss;
enum zio_checksum ddt_checksum; /* checksum algorithm in use */
spa_t *ddt_spa; /* pool this ddt is on */
objset_t *ddt_os; /* ddt objset (always MOS) */