diff options
| author | Finix1979 <[email protected]> | 2022-09-09 01:29:41 +0800 |
|---|---|---|
| committer | GitHub <[email protected]> | 2022-09-08 10:29:41 -0700 |
| commit | 320f0c6022e1c9bdc9063f849c6b2e4fa3b93995 (patch) | |
| tree | 644183a6289eaea14a99e76c386292518c07ee7a /config/kernel-generic_fadvise.m4 | |
| parent | 380b08098edf152b1d98e4f48b9577ce44d39166 (diff) | |
Add Linux posix_fadvise support
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 <[email protected]>
Signed-off-by: Finix Yan <[email protected]>
Closes #13694
Diffstat (limited to 'config/kernel-generic_fadvise.m4')
| -rw-r--r-- | config/kernel-generic_fadvise.m4 | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/config/kernel-generic_fadvise.m4 b/config/kernel-generic_fadvise.m4 new file mode 100644 index 000000000..8d122064b --- /dev/null +++ b/config/kernel-generic_fadvise.m4 @@ -0,0 +1,27 @@ +dnl # +dnl # 5.3 API change +dnl # The generic_fadvise() function is present since 4.19 kernel +dnl # but it was not exported until Linux 5.3. +dnl # +AC_DEFUN([ZFS_AC_KERNEL_SRC_GENERIC_FADVISE], [ + ZFS_LINUX_TEST_SRC([generic_fadvise], [ + #include <linux/fs.h> + ], [ + struct file *fp __attribute__ ((unused)) = NULL; + loff_t offset __attribute__ ((unused)) = 0; + loff_t len __attribute__ ((unused)) = 0; + int advise __attribute__ ((unused)) = 0; + generic_fadvise(fp, offset, len, advise); + ]) +]) + +AC_DEFUN([ZFS_AC_KERNEL_GENERIC_FADVISE], [ + AC_MSG_CHECKING([whether generic_fadvise() is available]) + ZFS_LINUX_TEST_RESULT_SYMBOL([generic_fadvise], + [generic_fadvise], [mm/fadvise.c], [ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_GENERIC_FADVISE, 1, [yes]) + ],[ + AC_MSG_RESULT(no) + ]) +]) |