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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
Download Patch File Download Diff File Expand all files Collapse all files
config/kernel-fadvise.m4
+23
View File
@@ -0,0 +1,23 @@
dnl #
dnl # Linux 4.19 API
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_FADVISE], [
ZFS_LINUX_TEST_SRC([file_fadvise], [
#include <linux/fs.h>
static const struct file_operations
fops __attribute__ ((unused)) = {
.fadvise = NULL,
};
],[])
])
AC_DEFUN([ZFS_AC_KERNEL_FADVISE], [
AC_MSG_CHECKING([whether fops->fadvise() exists])
ZFS_LINUX_TEST_RESULT([file_fadvise], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FILE_FADVISE, 1, [fops->fadvise() exists])
],[
AC_MSG_RESULT(no)
])
])
config/kernel-generic_fadvise.m4
+27
View File
@@ -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)
])
])
config/kernel.m4
+4
View File
@@ -42,6 +42,8 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_ACCESS_OK_TYPE
ZFS_AC_KERNEL_SRC_PDE_DATA
ZFS_AC_KERNEL_SRC_FALLOCATE
ZFS_AC_KERNEL_SRC_FADVISE
ZFS_AC_KERNEL_SRC_GENERIC_FADVISE
ZFS_AC_KERNEL_SRC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
ZFS_AC_KERNEL_SRC_RWSEM
ZFS_AC_KERNEL_SRC_SCHED
@@ -161,6 +163,8 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_OBJTOOL
ZFS_AC_KERNEL_PDE_DATA
ZFS_AC_KERNEL_FALLOCATE
ZFS_AC_KERNEL_FADVISE
ZFS_AC_KERNEL_GENERIC_FADVISE
ZFS_AC_KERNEL_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
ZFS_AC_KERNEL_RWSEM
ZFS_AC_KERNEL_SCHED