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As Dave Chinner has complained about on IRC, there are a couple of
things about reflink that are very inefficient. First of all, we
limited the size of all bunmapi operations to avoid flooding the log
with defer ops in the worst case, but recent changes to the defer ops
code have solved that problem, so get rid of the bunmapi length clamp.
Second, the log reservations for reflink operations are far far larger
than they need to be. Shrink them to exactly what we need to handle
each deferred RUI and CUI log item, and no more. Also reduce logcount
because we don't need 8 rolls per operation. Introduce a transaction
reservation compatibility layer to avoid changing the minimum log size
calculations.
v2: better document the use of EFIs to track when refcount updates
should be continued in a new transaction, disentangle the alternate
log space reservation code
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Merge tag 'reflink-speedups-5.19_2022-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into xfs-5.19-for-next
xfs: fix reflink inefficiencies
As Dave Chinner has complained about on IRC, there are a couple of
things about reflink that are very inefficient. First of all, we
limited the size of all bunmapi operations to avoid flooding the log
with defer ops in the worst case, but recent changes to the defer
ops code have solved that problem, so get rid of the bunmapi length
clamp.
Second, the log reservations for reflink operations are far far
larger than they need to be. Shrink them to exactly what we need to
handle each deferred RUI and CUI log item, and no more. Also reduce
logcount because we don't need 8 rolls per operation. Introduce a
transaction reservation compatibility layer to avoid changing the
minimum log size calculations.
Signed-off-by: Dave Chinner <david@fromorbit.com>
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| init | ||
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| kernel | ||
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| mm | ||
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| samples | ||
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| usr | ||
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| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
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| .gitignore | ||
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| COPYING | ||
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| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.