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Olivier Langlois adc8682ec6 io_uring: Add support for napi_busy_poll 
The sqpoll thread can be used for performing the napi busy poll in a
similar way that it does io polling for file systems supporting direct
access bypassing the page cache.

The other way that io_uring can be used for napi busy poll is by
calling io_uring_enter() to get events.

If the user specify a timeout value, it is distributed between polling
and sleeping by using the systemwide setting
/proc/sys/net/core/busy_poll.

The changes have been tested with this program:
https://github.com/lano1106/io_uring_udp_ping

and the result is:
Without sqpoll:
NAPI busy loop disabled:
rtt min/avg/max/mdev = 40.631/42.050/58.667/1.547 us
NAPI busy loop enabled:
rtt min/avg/max/mdev = 30.619/31.753/61.433/1.456 us

With sqpoll:
NAPI busy loop disabled:
rtt min/avg/max/mdev = 42.087/44.438/59.508/1.533 us
NAPI busy loop enabled:
rtt min/avg/max/mdev = 35.779/37.347/52.201/0.924 us

Co-developed-by: Hao Xu <haoxu@linux.alibaba.com>
Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Link: https://lore.kernel.org/r/810bd9408ffc510ff08269e78dca9df4af0b9e4e.1646777484.git.olivier@trillion01.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-03-10 09:18:30 -07:00
..
9p
Revert "fs/9p: search open fids first"
2022-01-30 22:13:37 +09:00
adfs
fs/adfs: remove unneeded variable make code cleaner
2022-01-20 08:52:55 +02:00
affs
affs: use bdev_nr_sectors instead of open coding it
2021-10-18 14:43:22 -06:00
afs
proc: remove PDE_DATA() completely
2022-01-22 08:33:37 +02:00
autofs
autofs: fix wait name hash calculation in autofs_wait()
2021-10-20 21:09:02 -04:00
befs
isystem: ship and use stdarg.h
2021-08-19 09:02:55 +09:00
bfs
mm: require ->set_page_dirty to be explicitly wired up
2021-06-29 10:53:48 -07:00
btrfs
for-5.17-rc6-tag
2022-03-06 12:19:36 -08:00
cachefiles
cachefiles: Fix incorrect length to fallocate()
2022-03-03 11:35:21 -08:00
ceph
ceph: set pool_ns in new inode layout for async creates
2022-01-26 20:17:50 +01:00
cifs
cifs: fix confusing unneeded warning message on smb2.1 and earlier
2022-02-16 17:16:49 -06:00
coda
coda: bump module version to 7.2
2021-11-09 10:02:51 -08:00
configfs
configfs: fix a race in configfs_{,un}register_subsystem()
2022-02-22 18:30:28 +01:00
cramfs
cramfs: use bdev_nr_bytes instead of open coding it
2021-10-18 14:43:22 -06:00
crypto
fscrypt: improve a few comments
2021-10-25 19:11:50 -07:00
debugfs
debugfs: lockdown: Allow reading debugfs files that are not world readable
2022-01-06 15:47:41 +01:00
devpts
fsnotify: fix fsnotify hooks in pseudo filesystems
2022-01-24 14:17:02 +01:00
dlm
driver core changes for 5.17-rc1
2022-01-12 11:11:34 -08:00
ecryptfs
fs: add is_idmapped_mnt() helper
2021-12-03 18:44:06 +01:00
efivarfs
…
efs
…
erofs
erofs: fix ztailpacking on > 4GiB filesystems
2022-03-02 21:58:45 +08:00
exfat
exfat: fix missing REQ_SYNC in exfat_update_bhs()
2022-01-10 11:00:04 +09:00
exportfs
…
ext2
fsdax: shift partition offset handling into the file systems
2021-12-04 08:58:54 -08:00
ext4
Various bug fixes for ext4 fast commit and inline data handling. Also
2022-02-06 10:34:45 -08:00
f2fs
Fix from Christoph Hellwig merging the CONFIG_UNICODE_UTF8_DATA into the
2022-02-01 11:13:24 -08:00
fat
FAT: use io_schedule_timeout() instead of congestion_wait()
2022-01-20 08:52:54 +02:00
freevxfs
…
fscache
fscache: Fix the volume collision wait condition
2022-01-21 21:36:28 +00:00
fuse
virtio,vdpa,qemu_fw_cfg: features, cleanups, fixes
2022-01-18 10:05:48 +02:00
gfs2
gfs2 fixes:
2022-02-11 11:36:32 -08:00
hfs
Merge branch 'akpm' (patches from Andrew)
2021-11-09 10:11:53 -08:00
hfsplus
hfsplus: use struct_group_attr() for memcpy() region
2022-01-20 08:52:54 +02:00
hostfs
hostfs: Fix writeback of dirty pages
2021-12-21 21:44:27 +01:00
hpfs
treewide: Replace open-coded flex arrays in unions
2021-10-18 12:28:53 -07:00
hugetlbfs
hugetlbfs: fix off-by-one error in hugetlb_vmdelete_list()
2022-01-15 16:30:30 +02:00
iomap
xfs, iomap: limit individual ioend chain lengths in writeback
2022-01-26 09:19:20 -08:00
isofs
isofs: Fix out of bound access for corrupted isofs image
2021-10-19 12:51:02 +02:00
jbd2
Various bug fixes for ext4 fast commit and inline data handling. Also
2022-02-06 10:34:45 -08:00
jffs2
Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2022-01-17 05:49:30 +02:00
jfs
Just one JFS patch
2021-11-03 09:23:25 -07:00
kernfs
kernfs: prevent early freeing of root node
2021-12-03 14:36:21 +01:00
ksmbd
ksmbd: add support for key exchange
2022-02-04 00:12:22 -06:00
lockd
Notable bug fixes:
2022-02-02 10:14:31 -08:00
minix
mm: require ->set_page_dirty to be explicitly wired up
2021-06-29 10:53:48 -07:00
netfs
netfs: Make ops->init_rreq() optional
2022-01-21 21:36:28 +00:00
nfs
NFS: Do not report writeback errors in nfs_getattr()
2022-02-16 15:15:22 -05:00
nfs_common
nfs: Fix kerneldoc warning shown up by W=1
2021-10-04 22:02:17 +01:00
nfsd
Notable bug fixes:
2022-02-09 09:56:57 -08:00
nilfs2
Merge branch 'akpm' (patches from Andrew)
2022-01-20 10:41:01 +02:00
nls
…
notify
fanotify: Fix stale file descriptor in copy_event_to_user()
2022-02-01 12:52:07 +01:00
ntfs
fs/ntfs/attrib.c: fix one kernel-doc comment
2022-01-15 16:30:24 +02:00
ntfs3
mm: remove cleancache
2022-01-22 08:33:38 +02:00
ocfs2
ocfs2: fix a deadlock when commit trans
2022-01-30 09:56:58 +02:00
omfs
mm: require ->set_page_dirty to be explicitly wired up
2021-06-29 10:53:48 -07:00
openpromfs
…
orangefs
orangefs: Fix the size of a memory allocation in orangefs_bufmap_alloc()
2021-12-31 14:37:43 -05:00
overlayfs
overlayfs fixes for 5.17-rc3
2022-02-01 11:23:02 -08:00
proc
proc: fix documentation and description of pagemap
2022-03-05 11:08:33 -08:00
pstore
pstore update for v5.17-rc1
2022-01-10 11:48:37 -08:00
qnx4
qnx4: work around gcc false positive warning bug
2021-09-21 08:36:48 -07:00
qnx6
…
quota
quota: make dquot_quota_sync return errors from ->sync_fs
2022-01-30 08:59:47 -08:00
ramfs
Merge branch 'akpm' (patches from Andrew)
2021-11-09 10:11:53 -08:00
reiserfs
reiserfs: don't use congestion_wait()
2021-11-18 11:52:22 +01:00
romfs
…
smbfs_common
smb3: add new defines from protocol specification
2022-01-18 16:50:47 -06:00
squashfs
squashfs: provide backing_dev_info in order to disable read-ahead
2022-01-15 16:30:24 +02:00
sysfs
fs/sysfs/dir.c: replace S_IRWXU|S_IRUGO|S_IXUGO with 0755 sysfs_create_dir_ns()
2021-10-05 16:35:05 +02:00
sysv
sysv: use BUILD_BUG_ON instead of runtime check
2021-11-09 10:02:52 -08:00
tracefs
tracefs: Set the group ownership in apply_options() not parse_options()
2022-02-25 21:05:04 -05:00
ubifs
ubifs: read-only if LEB may always be taken in ubifs_garbage_collect
2021-12-23 22:30:38 +01:00
udf
udf: Restore i_lenAlloc when inode expansion fails
2022-01-24 14:45:02 +01:00
ufs
isystem: ship and use stdarg.h
2021-08-19 09:02:55 +09:00
unicode
Fix from Christoph Hellwig merging the CONFIG_UNICODE_UTF8_DATA into the
2022-02-01 11:13:24 -08:00
vboxsf
vboxfs: fix broken legacy mount signature checking
2021-09-27 11:26:21 -07:00
verity
fs-verity: fix signed integer overflow with i_size near S64_MAX
2021-09-22 10:56:34 -07:00
xfs
Bug fixes for 5.17-rc4:
2022-02-26 09:53:19 -08:00
zonefs
zonefs: add MODULE_ALIAS_FS
2021-12-17 16:56:35 +09:00
aio.c
aio: move aio sysctl to aio.c
2022-01-22 08:33:34 +02:00
anon_inodes.c
fs: add anon_inode_getfile_secure() similar to anon_inode_getfd_secure()
2021-09-19 22:35:37 -04:00
attr.c
fs: handle circular mappings correctly
2021-11-17 09:26:09 +01:00
bad_inode.c
vfs: add rcu argument to ->get_acl() callback
2021-08-18 22:08:24 +02:00
binfmt_aout.c
binfmt: a.out: Fix bogus semicolon
2021-09-05 10:15:05 -07:00
binfmt_elf_fdpic.c
coredump: Limit coredumps to a single thread group
2021-10-08 12:06:02 -05:00
binfmt_elf.c
binfmt_elf fix for v5.17-rc7
2022-03-01 11:31:37 -08:00
binfmt_flat.c
binfmt: remove in-tree usage of MAP_EXECUTABLE
2021-06-29 10:53:50 -07:00
binfmt_misc.c
Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-02-09 09:50:02 -08:00
binfmt_script.c
…
buffer.c
fs/buffer: Convert __block_write_begin_int() to take a folio
2021-12-16 15:49:51 -05:00
char_dev.c
…
compat_binfmt_elf.c
…
coredump.c
fs/coredump: move coredump sysctls into its own file
2022-01-22 08:33:36 +02:00
d_path.c
d_path: fix Kernel doc validator complaining
2021-11-06 13:30:32 -07:00
dax.c
dax: remove the copy_from_iter and copy_to_iter methods
2021-12-18 08:04:53 -08:00
dcache.c
fs: move dcache sysctls to its own file
2022-01-22 08:33:36 +02:00
direct-io.c
fs: get rid of the res2 iocb->ki_complete argument
2021-10-25 10:36:24 -06:00
drop_caches.c
fs: drop_caches: fix skipping over shadow cache inodes
2021-09-03 09:58:10 -07:00
eventfd.c
eventfd: Export eventfd_wake_count to modules
2021-09-06 07:20:56 -04:00
eventpoll.c
eventpoll: simplify sysctl declaration with register_sysctl()
2022-01-22 08:33:35 +02:00
exec.c
fs/coredump: move coredump sysctls into its own file
2022-01-22 08:33:36 +02:00
fcntl.c
Merge branch 'akpm' (patches from Andrew)
2021-09-03 10:08:28 -07:00
fhandle.c
…
file_table.c
fs/file_table: fix adding missing kmemleak_not_leak()
2022-02-17 10:23:19 -08:00
file.c
fget: clarify and improve __fget_files() implementation
2021-12-13 10:55:30 -08:00
filesystems.c
fs: simplify get_filesystem_list / get_all_fs_names
2021-08-23 01:25:40 -04:00
fs_context.c
vfs: fs_context: fix up param length parsing in legacy_parse_param
2022-01-18 09:23:19 +02:00
fs_parser.c
fs_parse: allow parameter value to be empty
2021-12-09 14:09:36 -05:00
fs_pin.c
…
fs_struct.c
…
fs_types.c
…
fs-writeback.c
fscache rewrite
2022-01-12 13:45:12 -08:00
fsopen.c
…
init.c
…
inode.c
fs: move inode sysctls to its own file
2022-01-22 08:33:35 +02:00
internal.h
fs/buffer: Convert __block_write_begin_int() to take a folio
2021-12-16 15:49:51 -05:00
io_uring.c
io_uring: Add support for napi_busy_poll
2022-03-10 09:18:30 -07:00
io-wq.c
io-wq: use IO_WQ_ACCT_NR rather than hardcoded number
2022-03-10 06:32:49 -07:00
io-wq.h
Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2022-01-17 05:49:30 +02:00
ioctl.c
fs/ioctl: remove unnecessary __user annotation
2022-01-15 16:30:25 +02:00
Kconfig
ksmbd: add support for key exchange
2022-02-04 00:12:22 -06:00
Kconfig.binfmt
binfmt: remove support for em86 (alpha only)
2021-07-25 22:33:03 -07:00
kernel_read_file.c
vfs: check fd has read access in kernel_read_file_from_fd()
2021-10-18 20:22:03 -10:00
libfs.c
unicode: clean up the Kconfig symbol confusion
2022-01-20 19:57:24 -05:00
locks.c
fs: move locking sysctls where they are used
2022-01-22 08:33:36 +02:00
Makefile
Fix from Christoph Hellwig merging the CONFIG_UNICODE_UTF8_DATA into the
2022-02-01 11:13:24 -08:00
mbcache.c
…
mount.h
…
mpage.c
mm: remove cleancache
2022-01-22 08:33:38 +02:00
namei.c
\n
2022-01-28 17:51:31 +02:00
namespace.c
fs: add kernel doc for mnt_{hold,unhold}_writers()
2022-02-14 08:35:32 +01:00
no-block.c
…
nsfs.c
…
open.c
fs: support mapped mounts of mapped filesystems
2021-12-05 10:28:57 +01:00
pipe.c
fs: move pipe sysctls to is own file
2022-01-22 08:33:36 +02:00
pnode.c
…
pnode.h
…
posix_acl.c
fs: support mapped mounts of mapped filesystems
2021-12-05 10:28:57 +01:00
proc_namespace.c
fs: add is_idmapped_mnt() helper
2021-12-03 18:44:06 +01:00
read_write.c
fs: remove leftover comments from mandatory locking removal
2021-10-26 12:20:50 -04:00
readdir.c
…
remap_range.c
fs: Convert vfs_dedupe_file_range_compare to folios
2022-01-08 00:28:41 -05:00
select.c
select: Fix indefinitely sleeping task in poll_schedule_timeout()
2022-01-11 09:03:05 -08:00
seq_file.c
seq_file: move seq_escape() to a header
2021-11-09 10:02:52 -08:00
signalfd.c
Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2022-01-17 05:49:30 +02:00
splice.c
…
stack.c
…
stat.c
fs: add generic helper for filling statx attribute flags
2021-08-17 11:47:43 +02:00
statfs.c
…
super.c
vfs: make freeze_super abort when sync_filesystem returns error
2022-01-30 08:59:47 -08:00
sync.c
vfs: make sync_filesystem return errors from ->sync_fs
2022-01-30 08:59:47 -08:00
sysctls.c
fs: move namespace sysctls and declare fs base directory
2022-01-22 08:33:36 +02:00
timerfd.c
timerfd: Provide timerfd_resume()
2021-08-10 17:57:22 +02:00
userfaultfd.c
mm: refactor vm_area_struct::anon_vma_name usage code
2022-03-05 11:08:32 -08:00
utimes.c
…
xattr.c
…