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ZIL: Avoid dbuf_read() before dmu_sync().

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In most cases dmu_sync() works with dirty records directly and does
not need actual data. The only exception is dmu_sync_late_arrival().
To save some CPU time use dmu_buf_hold_noread*() in z*_get_data()
and explicitly call dbuf_read() in dmu_sync_late_arrival(). There
is also a chance that by that time TXG will already be synced and
we won't have to do it at all.

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 #15153
This commit is contained in:
Alexander Motin
2023-08-11 12:04:08 -04:00
committed by GitHub
parent 8ce2eba9e6
commit bdb7df4245
5 changed files with 16 additions and 7 deletions
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module/zfs/zvol.c
+2 -2
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@@ -727,8 +727,8 @@ zvol_get_data(void *arg, uint64_t arg2, lr_write_t *lr, char *buf,
offset = P2ALIGN_TYPED(offset, size, uint64_t);
zgd->zgd_lr = zfs_rangelock_enter(&zv->zv_rangelock, offset,
size, RL_READER);
error = dmu_buf_hold_by_dnode(zv->zv_dn, offset, zgd, &db,
DMU_READ_NO_PREFETCH);
error = dmu_buf_hold_noread_by_dnode(zv->zv_dn, offset, zgd,
&db);
if (error == 0) {
blkptr_t *bp = &lr->lr_blkptr;