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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/zfs-tests/cmd/Makefile.am
+3
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@@ -128,4 +128,7 @@ scripts_zfs_tests_bin_PROGRAMS += %D%/read_dos_attributes %D%/write_dos_attribu
scripts_zfs_tests_bin_PROGRAMS += %D%/randfree_file
%C%_randfree_file_SOURCES = %D%/file/randfree_file.c
scripts_zfs_tests_bin_PROGRAMS += %D%/file_fadvise
%C%_file_fadvise_SOURCES = %D%/file/file_fadvise.c
endif