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ARC: Remove b_cv from struct l1arc_buf_hdr #15340

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@amotin amotin commented Oct 2, 2023

Earlier as part of #14123 I've removed one use of b_cv. This patch reuses the same approach to remove the other one from much more rare code path.

This saves 16 bytes of L1 ARC header on FreeBSD (reducing it from 200 to 184 bytes) and seems even more on Linux.

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Performance enhancement (non-breaking change which improves efficiency)
  • Code cleanup (non-breaking change which makes code smaller or more readable)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
  • Documentation (a change to man pages or other documentation)

Checklist:

Earlier as part of openzfs#14123 I've removed one use of b_cv.  This patch
reuses the same approach to remove the other one from much more
rare code path.

This saves 16 bytes of L1 ARC header on FreeBSD (reducing it from
200 to 184 bytes) and seems even more on Linux.

Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
@amotin amotin added the Status: Code Review Needed Ready for review and testing label Oct 3, 2023
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Makes sense, thanks for referencing the original commit this depend on that was helpful.

@behlendorf behlendorf added Status: Accepted Ready to integrate (reviewed, tested) and removed Status: Code Review Needed Ready for review and testing labels Oct 4, 2023
@behlendorf behlendorf merged commit 2a6c621 into openzfs:master Oct 4, 2023
18 of 19 checks passed
@amotin amotin deleted the no_b_cv branch October 4, 2023 23:30
behlendorf pushed a commit to behlendorf/zfs that referenced this pull request Oct 6, 2023
Earlier as part of openzfs#14123 I've removed one use of b_cv.  This patch
reuses the same approach to remove the other one from much more
rare code path.

This saves 16 bytes of L1 ARC header on FreeBSD (reducing it from
200 to 184 bytes) and seems even more on Linux.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes openzfs#15340
behlendorf pushed a commit that referenced this pull request Oct 7, 2023
Earlier as part of #14123 I've removed one use of b_cv.  This patch
reuses the same approach to remove the other one from much more
rare code path.

This saves 16 bytes of L1 ARC header on FreeBSD (reducing it from
200 to 184 bytes) and seems even more on Linux.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #15340
lundman pushed a commit to openzfsonwindows/openzfs that referenced this pull request Dec 12, 2023
Earlier as part of openzfs#14123 I've removed one use of b_cv.  This patch
reuses the same approach to remove the other one from much more
rare code path.

This saves 16 bytes of L1 ARC header on FreeBSD (reducing it from
200 to 184 bytes) and seems even more on Linux.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes openzfs#15340
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