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Add Linux posix_fadvise support

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The purpose of this PR is to accepts fadvise ioctl from userland
to do read-ahead by demand.

It could dramatically improve sequential read performance especially
when primarycache is set to metadata or zfs_prefetch_disable is 1.

If the file is mmaped, generic_fadvise is also called for page cache
read-ahead besides dmu_prefetch.

Only POSIX_FADV_WILLNEED and POSIX_FADV_SEQUENTIAL are supported in
this PR currently.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Finix Yan <yancw@info2soft.com>
Closes #13694
This commit is contained in:
Finix1979
2022-09-09 01:29:41 +08:00
committed by GitHub
parent 380b08098e
commit 320f0c6022
15 changed files with 365 additions and 2 deletions
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tests/runfiles/linux.run
+4
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@@ -89,6 +89,10 @@ tags = ['functional', 'devices']
tests = ['events_001_pos', 'events_002_pos', 'zed_rc_filter', 'zed_fd_spill']
tags = ['functional', 'events']
[tests/functional/fadvise:Linux]
tests = ['fadvise_sequential']
tags = ['functional', 'fadvise']
[tests/functional/fallocate:Linux]
tests = ['fallocate_prealloc', 'fallocate_zero-range']
tags = ['functional', 'fallocate']