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ZIO: Optimize zio_flush() #15515

Merged
merged 1 commit into from
Nov 17, 2023
Merged

ZIO: Optimize zio_flush() #15515

merged 1 commit into from
Nov 17, 2023

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@amotin amotin commented Nov 11, 2023 •
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  • Generalize vdev_nowritecache handling by traversing through the VDEV tree and skipping children ZIOs where not supported.
  • Remove intermediate zio_null() in case of several VDEV children.
  • Remove children handling from zio_ioctl(). There are no other use cases for this code beside DKIOCFLUSHWRITECACHED, and would there be, I doubt they would so straightforward apply to all VDEV children.

Comparing to removed previous optimization this should improve cases of redundant ZILs/SLOGs.

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:

@amotin
ZIO: Optimize zio_flush()
dd779e1 
 - Generalize vdev_nowritecache handling by traversing through the
VDEV tree and skipping children ZIOs where not supported.
 - Remove intermediate zio_null() in case of several VDEV children.
 - Remove children handling from zio_ioctl().  There are no other
use cases for this code beside DKIOCFLUSHWRITECACHED, and would there
be, I doubt they would so straightforward apply to all VDEV children.

Comparing to removed previous optimization this should improve cases
of redundant ZILs/SLOGs.

Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
@behlendorf behlendorf added the Status: Code Review Needed Ready for review and testing label Nov 13, 2023
@behlendorf behlendorf added Status: Accepted Ready to integrate (reviewed, tested) and removed Status: Code Review Needed Ready for review and testing labels Nov 14, 2023
@behlendorf behlendorf merged commit 5a3bffa into openzfs:master Nov 17, 2023
17 of 25 checks passed
@amotin amotin deleted the noflush branch November 17, 2023 22:10
lundman pushed a commit to openzfsonwindows/openzfs that referenced this pull request Dec 12, 2023
@amotin @lundman
ZIO: Optimize zio_flush()
64b2408 
- Generalize vdev_nowritecache handling by traversing through the
VDEV tree and skipping children ZIOs where not supported.
 - Remove intermediate zio_null() in case of several VDEV children.
 - Remove children handling from zio_ioctl().  There are no other
use cases for this code beside DKIOCFLUSHWRITECACHED, and would there
be, I doubt they would so straightforward apply to all VDEV children.

Comparing to removed previous optimization this should improve cases
of redundant ZILs/SLOGs.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Wilson <george.wilson@delphix.com>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes openzfs#15515
ixhamza pushed a commit to truenas/zfs that referenced this pull request Jan 15, 2024
@amotin @ixhamza
ZIO: Optimize zio_flush()
8126452 
- Generalize vdev_nowritecache handling by traversing through the
VDEV tree and skipping children ZIOs where not supported.
 - Remove intermediate zio_null() in case of several VDEV children.
 - Remove children handling from zio_ioctl().  There are no other
use cases for this code beside DKIOCFLUSHWRITECACHED, and would there
be, I doubt they would so straightforward apply to all VDEV children.

Comparing to removed previous optimization this should improve cases
of redundant ZILs/SLOGs.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Wilson <george.wilson@delphix.com>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes openzfs#15515
ixhamza pushed a commit to truenas/zfs that referenced this pull request Jan 17, 2024
@amotin @ixhamza
ZIO: Optimize zio_flush()
3009e11 
- Generalize vdev_nowritecache handling by traversing through the
VDEV tree and skipping children ZIOs where not supported.
 - Remove intermediate zio_null() in case of several VDEV children.
 - Remove children handling from zio_ioctl().  There are no other
use cases for this code beside DKIOCFLUSHWRITECACHED, and would there
be, I doubt they would so straightforward apply to all VDEV children.

Comparing to removed previous optimization this should improve cases
of redundant ZILs/SLOGs.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Wilson <george.wilson@delphix.com>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes openzfs#15515
amotin added a commit to amotin/zfs that referenced this pull request Apr 17, 2024
@amotin
ZIO: Optimize zio_flush()
98c24e9 
- Generalize vdev_nowritecache handling by traversing through the
VDEV tree and skipping children ZIOs where not supported.
 - Remove intermediate zio_null() in case of several VDEV children.
 - Remove children handling from zio_ioctl().  There are no other
use cases for this code beside DKIOCFLUSHWRITECACHED, and would there
be, I doubt they would so straightforward apply to all VDEV children.

Comparing to removed previous optimization this should improve cases
of redundant ZILs/SLOGs.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Wilson <george.wilson@delphix.com>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes openzfs#15515
behlendorf pushed a commit that referenced this pull request Apr 19, 2024
@amotin @behlendorf
ZIO: Optimize zio_flush()
8b1a132 
- Generalize vdev_nowritecache handling by traversing through the
VDEV tree and skipping children ZIOs where not supported.
 - Remove intermediate zio_null() in case of several VDEV children.
 - Remove children handling from zio_ioctl().  There are no other
use cases for this code beside DKIOCFLUSHWRITECACHED, and would there
be, I doubt they would so straightforward apply to all VDEV children.

Comparing to removed previous optimization this should improve cases
of redundant ZILs/SLOGs.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Wilson <george.wilson@delphix.com>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #15515
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@grwilson grwilson grwilson approved these changes

@behlendorf behlendorf behlendorf approved these changes

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@amotin @behlendorf @grwilson