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e2af2acce3
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 <batkinson@lanl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Issue #8853 Closes #11439 |
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| .. | ||
| os | ||
| sys | ||
| .gitignore | ||
| cityhash.h | ||
| libnvpair.h | ||
| libuutil_common.h | ||
| libuutil_impl.h | ||
| libuutil.h | ||
| libzfs_core.h | ||
| libzfs_impl.h | ||
| libzfs.h | ||
| libzfsbootenv.h | ||
| libzutil.h | ||
| Makefile.am | ||
| thread_pool.h | ||
| zfeature_common.h | ||
| zfs_comutil.h | ||
| zfs_deleg.h | ||
| zfs_fletcher.h | ||
| zfs_namecheck.h | ||
| zfs_prop.h | ||