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320f0c6022
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
24 lines
491 B
Plaintext
24 lines
491 B
Plaintext
dnl #
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dnl # Linux 4.19 API
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_SRC_FADVISE], [
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ZFS_LINUX_TEST_SRC([file_fadvise], [
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#include <linux/fs.h>
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static const struct file_operations
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fops __attribute__ ((unused)) = {
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.fadvise = NULL,
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};
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],[])
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])
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AC_DEFUN([ZFS_AC_KERNEL_FADVISE], [
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AC_MSG_CHECKING([whether fops->fadvise() exists])
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ZFS_LINUX_TEST_RESULT([file_fadvise], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_FILE_FADVISE, 1, [fops->fadvise() exists])
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],[
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AC_MSG_RESULT(no)
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])
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])
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