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Some ZIO micro-optimizations.

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- Pack struct zio_prop by 4 bytes from 84 to 80.
 - Skip new child ZIO locking while linking to parent.  The newly
allocated ZIO is not externally visible yet, so nobody should care.
 - Skip io_bp_copy writes when not used (write && non-debug).

Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #14985
This commit is contained in:
Alexander Motin
2023-06-30 11:54:00 -04:00
committed by GitHub
parent fa7b2390d4
commit b4a0873092
2 changed files with 45 additions and 10 deletions
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include/sys/zio.h
+2 -1
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@@ -341,9 +341,9 @@ typedef struct zio_prop {
enum zio_checksum zp_checksum;
enum zio_compress zp_compress;
uint8_t zp_complevel;
dmu_object_type_t zp_type;
uint8_t zp_level;
uint8_t zp_copies;
dmu_object_type_t zp_type;
boolean_t zp_dedup;
boolean_t zp_dedup_verify;
boolean_t zp_nopwrite;
@@ -611,6 +611,7 @@ extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **);
extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **);
extern zio_t *zio_unique_parent(zio_t *cio);
extern void zio_add_child(zio_t *pio, zio_t *cio);
extern void zio_add_child_first(zio_t *pio, zio_t *cio);
extern void *zio_buf_alloc(size_t size);
extern void zio_buf_free(void *buf, size_t size);