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Alexander Motin 928eccc5bc DDT: Reduce global DDT lock scope during writes

Before this change DDT lock was taken 4 times per written block,
and as effectively a pool-wide lock it can be highly congested.
This change introduces a new per-entry dde_io_lock, protecting some
fields during I/O ready and done stages, so that we don't need the
global lock there.

According to my write tests on 64-thread system with 4KB blocks this
significantly reduce the global lock contention, reducing CPU usage
from 100% to expected ~80%, and increasing write throughput by 10%.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes #17960

2025-12-01 10:44:10 -08:00

avl

Prefer VERIFY0P(n) over VERIFY(n == NULL)

2025-08-07 11:41:37 -07:00

icp

icp: remove global icp includes

2025-11-12 10:03:51 -08:00

lua

SPDX: license tags: MIT

2025-03-13 17:56:54 -07:00

nvpair

Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)