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author | Matthew Ahrens <[email protected]> | 2021-01-20 11:24:37 -0800 |
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committer | GitHub <[email protected]> | 2021-01-20 11:24:37 -0800 |
commit | e2af2acce3436acdb2b35fdc7c9de1a30ea85514 (patch) | |
tree | 198e20c21653d28207e1f522e5134b16a7747dcc /module/os/linux/zfs/zpl_inode.c | |
parent | 03f036cbccdd8699f5fe8540ef317595a35bceb8 (diff) |
allow callers to allocate and provide the abd_t struct
The `abd_get_offset_*()` routines create an abd_t that references
another abd_t, and doesn't allocate any pages/buffers of its own. In
some workloads, these routines may be called frequently, to create many
abd_t's representing small pieces of a single large abd_t. In
particular, the upcoming RAIDZ Expansion project makes heavy use of
these routines.
This commit adds the ability for the caller to allocate and provide the
abd_t struct to a variant of `abd_get_offset_*()`. This eliminates the
cost of allocating the abd_t and performing the accounting associated
with it (`abdstat_struct_size`). The RAIDZ/DRAID code uses this for
the `rc_abd`, which references the zio's abd. The upcoming RAIDZ
Expansion project will leverage this infrastructure to increase
performance of reads post-expansion by around 50%.
Additionally, some of the interfaces around creating and destroying
abd_t's are cleaned up. Most significantly, the distinction between
`abd_put()` and `abd_free()` is eliminated; all types of abd_t's are
now disposed of with `abd_free()`.
Reviewed-by: Brian Atkinson <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Matthew Ahrens <[email protected]>
Issue #8853
Closes #11439
Diffstat (limited to 'module/os/linux/zfs/zpl_inode.c')
0 files changed, 0 insertions, 0 deletions