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authorMatthew Ahrens <[email protected]>2021-01-20 11:24:37 -0800
committerGitHub <[email protected]>2021-01-20 11:24:37 -0800
commite2af2acce3436acdb2b35fdc7c9de1a30ea85514 (patch)
tree198e20c21653d28207e1f522e5134b16a7747dcc /module/os/linux/zfs/zpl_inode.c
parent03f036cbccdd8699f5fe8540ef317595a35bceb8 (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')
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