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Reduce dirty records memory usage #16694

Merged
merged 1 commit into from
Nov 5, 2024
Merged

Reduce dirty records memory usage #16694

merged 1 commit into from
Nov 5, 2024

Commits on Oct 31, 2024

  1. Reduce dirty records memory usage 

    Small block workloads may use a very large number of dirty records.
During simple block cloning test due to BRT still using 4KB blocks
I can easily see up to 2.5M of those used.  Before this change
dbuf_dirty_record_t structures representing them were allocated via
kmem_zalloc(), that rounded their size up to 512 bytes.

Introduction of specialized kmem cache allows to reduce the size
from 512 to 408 bytes.  Additionally, since override and raw params
in dirty records are mutually exclusive, puting them into a union
allows to reduce structure size down to 368 bytes, increasing the
saving to 28%, that can be a 0.5GB or more of RAM.

Signed-off-by:	Alexander Motin <[email protected]>
Sponsored by:	iXsystems, Inc.
    @amotin
    amotin committed Oct 31, 2024
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