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Soheil Hassas Yeganeh e59d3c64cb epoll: eliminate unnecessary lock for zero timeout 
We call ep_events_available() under lock when timeout is 0, and then call
it without locks in the loop for the other cases.

Instead, call ep_events_available() without lock for all cases.  For
non-zero timeouts, we will recheck after adding the thread to the wait
queue.  For zero timeout cases, by definition, user is opportunistically
polling and will have to call epoll_wait again in the future.

Note that this lock was kept in c5a282e9635e9 because the whole loop was
historically under lock.

This patch results in a 1% CPU/RPC reduction in RPC benchmarks.

Link: https://lkml.kernel.org/r/20201106231635.3528496-9-soheil.kdev@gmail.com
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Suggested-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Khazhismel Kumykov <khazhy@google.com>
Cc: Guantao Liu <guantaol@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-12-19 11:18:38 -08:00
..
9p
fs: 9p: add generic splice_write file operation
2020-12-01 21:40:47 +01:00
adfs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
affs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
afs
afs: Fix memory leak when mounting with multiple source parameters
2020-12-08 15:59:25 -08:00
autofs
file: Replace ksys_close with close_fd
2020-12-10 12:42:59 -06:00
befs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
bfs
bfs: don't use WARNING: string when it's just info.
2020-12-15 22:46:18 -08:00
btrfs
for-5.11/block-2020-12-14
2020-12-16 12:57:51 -08:00
cachefiles
cachefiles: Handle readpage error correctly
2020-10-26 10:42:54 -07:00
ceph
libceph, ceph: make use of __ceph_auth_get_authorizer() in msgr1
2020-12-14 23:21:50 +01:00
cifs
cifs/smb3 changes, the largest part are for support of the newer mount API, also includes addition of support for the SMB3 witness protocol which can provide important notifications from the server on address or export or network changes, and three patches for stable
2020-12-17 17:41:37 -08:00
coda
docs: filesystems: convert coda.txt to ReST
2020-05-05 09:22:21 -06:00
configfs
fs: configfs: delete repeated words in comments
2020-10-16 11:11:19 -07:00
cramfs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
crypto
f2fs-for-5.11-rc1
2020-12-17 11:18:00 -08:00
debugfs
debugfs: remove return value of debugfs_create_devm_seqfile()
2020-10-30 08:37:39 +01:00
devpts
…
dlm
fs: dlm: check on existing node address
2020-11-10 12:14:20 -06:00
ecryptfs
mm, treewide: rename kzfree() to kfree_sensitive()
2020-08-07 11:33:22 -07:00
efivarfs
efivarfs: revert "fix memory leak in efivarfs_create()"
2020-11-25 16:55:02 +01:00
efs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
erofs
erofs: avoid using generic_block_bmap
2020-12-10 11:07:40 +08:00
exfat
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
exportfs
exportfs: Add a function to return the raw output from fh_to_dentry()
2020-12-09 09:39:38 -05:00
ext2
ext2: Fix fall-through warnings for Clang
2020-11-23 10:36:53 +01:00
ext4
f2fs-for-5.11-rc1
2020-12-17 11:18:00 -08:00
f2fs
f2fs-for-5.11-rc1
2020-12-17 11:18:00 -08:00
fat
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
freevxfs
…
fscache
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2020-06-03 16:27:18 -07:00
fuse
fuse: fix bad inode
2020-12-10 15:33:14 +01:00
gfs2
gfs2: Fix deadlock between gfs2_{create_inode,inode_lookup} and delete_work_func
2020-12-01 00:21:10 +01:00
hfs
fs: Replace zero-length array with flexible-array member
2020-10-29 17:22:59 -05:00
hfsplus
fs: Replace zero-length array with flexible-array member
2020-10-29 17:22:59 -05:00
hostfs
hostfs: Use kasprintf() instead of fixed buffer formatting
2020-03-29 23:23:00 +02:00
hpfs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
hugetlbfs
hugetlbfs: prevent filesystem stacking of hugetlbfs
2020-08-12 10:57:56 -07:00
iomap
mm: memcontrol: Use helpers to read page's memcg data
2020-12-02 18:28:05 -08:00
isofs
fs: Replace zero-length array with flexible-array member
2020-10-29 17:22:59 -05:00
jbd2
jbd2: fix kernel-doc markups
2020-11-19 22:38:29 -05:00
jffs2
jffs2: Fix NULL pointer dereference in rp_size fs option parsing
2020-12-13 21:57:21 +01:00
jfs
jfs: Fix array index bounds check in dbAdjTree
2020-11-13 16:03:07 -06:00
kernfs
fs/kernfs: remove the double check of dentry->inode
2020-12-09 19:03:49 +01:00
lockd
fs/lockd: convert comma to semicolon
2020-12-16 07:57:37 -05:00
minix
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
nfs
NFS client updates for Linux 5.11
2020-12-17 12:15:03 -08:00
nfs_common
nfs_common: need lock during iterate through the list
2020-12-09 09:38:34 -05:00
nfsd
\n
2020-12-17 10:56:27 -08:00
nilfs2
fs/nilfs2: remove some unused macros to tame gcc
2020-12-15 22:46:17 -08:00
nls
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
notify
\n
2020-12-17 10:56:27 -08:00
ntfs
fs/ntfs: remove unused variable attr_len
2020-12-15 12:13:37 -08:00
ocfs2
ocfs2: ratelimit the 'max lookup times reached' notice
2020-12-15 12:13:37 -08:00
omfs
fs: omfs: use kmemdup() rather than kmalloc+memcpy
2020-09-22 23:39:45 -04:00
openpromfs
…
orangefs
orangefs: remove unnecessary assignment to variable ret
2020-08-04 15:01:58 -04:00
overlayfs
ovl: unprivieged mounts
2020-12-14 15:26:14 +01:00
proc
seccomp updates for v5.11-rc1
2020-12-16 11:30:10 -08:00
pstore
Tracing updates for 5.11
2020-12-17 13:22:17 -08:00
qnx4
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
qnx6
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
quota
\n
2020-12-17 11:00:37 -08:00
ramfs
ramfs: fix nommu mmap with gaps in the page cache
2020-10-16 11:11:22 -07:00
reiserfs
reiserfs: add check for an invalid ih_entry_count
2020-11-26 16:57:28 +01:00
romfs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
squashfs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
sysfs
sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output
2020-10-02 12:02:30 +02:00
sysv
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
tracefs
…
ubifs
This pull request contains changes for JFFS2, UBI and UBIFS:
2020-12-17 17:46:34 -08:00
udf
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
ufs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
unicode
unicode: Add utf8_casefold_hash
2020-09-10 14:03:31 -07:00
vboxsf
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2020-10-15 15:11:56 -07:00
verity
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2020-12-14 12:18:19 -08:00
xfs
for-5.11/block-2020-12-14
2020-12-16 12:57:51 -08:00
zonefs
zonefs: fix page reference and BIO leak
2020-12-10 15:14:19 +09:00
aio.c
Merge branch 'akpm' (patches from Andrew)
2020-12-15 12:53:37 -08:00
anon_inodes.c
…
attr.c
…
bad_inode.c
fs: move the fiemap definitions out of fs.h
2020-06-03 23:16:55 -04:00
binfmt_aout.c
exec: Rename flush_old_exec begin_new_exec
2020-05-07 16:55:47 -05:00
binfmt_elf_fdpic.c
binfmt_elf, binfmt_elf_fdpic: use a VMA list snapshot
2020-10-16 11:11:21 -07:00
binfmt_elf.c
Merge branch 'exec-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:29:43 -08:00
binfmt_em86.c
Merge branch 'akpm' (patches from Andrew)
2020-06-04 19:18:29 -07:00
binfmt_flat.c
binfmt_flat: revert "binfmt_flat: don't offset the data start"
2020-08-24 08:49:13 +10:00
binfmt_misc.c
Merge branch 'akpm' (patches from Andrew)
2020-06-04 19:18:29 -07:00
binfmt_script.c
Merge branch 'akpm' (patches from Andrew)
2020-06-04 19:18:29 -07:00
block_dev.c
block: stop using bdget_disk for partition 0
2020-12-01 14:53:40 -07:00
buffer.c
for-5.11/block-2020-12-14
2020-12-16 12:57:51 -08:00
char_dev.c
vfs: allow unprivileged whiteout creation
2020-05-14 16:44:23 +02:00
compat_binfmt_elf.c
elf: Expose ELF header on arch_setup_additional_pages()
2020-10-26 13:46:47 +01:00
coredump.c
Merge branch 'exec-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:29:43 -08:00
d_path.c
fs: fix NULL dereference due to data race in prepend_path()
2020-10-14 14:54:45 -07:00
dax.c
mm: simplify follow_pte{,pmd}
2020-12-15 22:46:19 -08:00
dcache.c
vfs: Use sequence counter with associated spinlock
2020-07-29 16:14:27 +02:00
dcookies.c
…
direct-io.c
\n
2020-10-15 15:03:10 -07:00
drop_caches.c
sysctl: pass kernel pointers to ->proc_handler
2020-04-27 02:07:40 -04:00
eventfd.c
eventfd: convert to f_op->read_iter()
2020-05-06 22:33:43 -04:00
eventpoll.c
epoll: eliminate unnecessary lock for zero timeout
2020-12-19 11:18:38 -08:00
exec.c
Merge branch 'parisc-5.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
2020-12-16 12:10:40 -08:00
fcntl.c
fcntl: Fix potential deadlock in send_sig{io, urg}()
2020-11-05 07:44:15 -05:00
fhandle.c
…
file_table.c
epoll: take epitem list out of struct file
2020-10-25 20:02:08 -04:00
file.c
Merge branch 'exec-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:29:43 -08:00
filesystems.c
fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once()
2020-04-10 15:36:22 -07:00
fs_context.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
fs_parser.c
fs_parse: mark fs_param_bad_value() as static
2020-10-13 18:38:27 -07:00
fs_pin.c
…
fs_struct.c
vfs: Use sequence counter with associated spinlock
2020-07-29 16:14:27 +02:00
fs_types.c
…
fs-writeback.c
writeback: don't warn on an unregistered BDI in __mark_inode_dirty
2020-12-16 11:56:02 +01:00
fsopen.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
init.c
init: add an init_dup helper
2020-08-04 21:02:38 -04:00
inode.c
block: remove i_bdev
2020-12-01 14:53:39 -07:00
internal.h
for-5.11/block-2020-12-14
2020-12-16 12:57:51 -08:00
io_uring.c
for-5.11/block-2020-12-14
2020-12-16 12:57:51 -08:00
io-wq.c
io_uring: always batch cancel in *cancel_files()
2020-12-09 12:04:00 -07:00
io-wq.h
io_uring: always batch cancel in *cancel_files()
2020-12-09 12:04:00 -07:00
ioctl.c
fs: remove ksys_ioctl
2020-07-31 08:16:01 +02:00
Kconfig
tmpfs: support 64-bit inums per-sb
2020-08-07 11:33:24 -07:00
Kconfig.binfmt
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
kernel_read_file.c
fs/kernel_file_read: Add "offset" arg for partial reads
2020-10-05 13:37:04 +02:00
libfs.c
f2fs-for-5.11-rc1
2020-12-17 11:18:00 -08:00
locks.c
Merge branch 'exec-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:29:43 -08:00
Makefile
Refactored code for 5.10:
2020-10-23 11:33:41 -07:00
mbcache.c
…
mount.h
mnt: Use generic ns_common::count
2020-08-19 14:14:19 +02:00
mpage.c
fs: convert mpage_readpages to mpage_readahead
2020-06-02 10:59:07 -07:00
namei.c
fs: make do_renameat2() take struct filename
2020-12-09 12:03:59 -07:00
namespace.c
fixes-v5.11
2020-12-14 16:40:27 -08:00
no-block.c
…
nsfs.c
nsproxy: attach to namespaces via pidfds
2020-05-13 11:41:22 +02:00
open.c
Merge branch 'exec-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:29:43 -08:00
pipe.c
block: remove i_bdev
2020-12-01 14:53:39 -07:00
pnode.c
propagate_one(): mnt_set_mountpoint() needs mount_lock
2020-04-27 10:37:14 -04:00
pnode.h
…
posix_acl.c
vfs: clean up posix_acl_permission() logic aroudn MAY_NOT_BLOCK
2020-06-08 11:04:19 -07:00
proc_namespace.c
Add a "nosymfollow" mount option.
2020-08-27 16:06:47 -04:00
read_write.c
Refactored code for 5.10:
2020-10-23 11:33:41 -07:00
readdir.c
fs: remove ksys_getdents64
2020-07-31 08:16:00 +02:00
remap_range.c
vfs: verify source area in vfs_dedupe_file_range_one()
2020-12-14 15:26:13 +01:00
select.c
fs: Replace zero-length array with flexible-array member
2020-10-29 17:22:59 -05:00
seq_file.c
fix return values of seq_read_iter()
2020-11-15 22:12:53 -05:00
signalfd.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
splice.c
io_uring-5.10-2020-10-24
2020-10-24 12:40:18 -07:00
stack.c
…
stat.c
fs: remove KSTAT_QUERY_FLAGS
2020-09-26 22:55:05 -04:00
statfs.c
block: remove i_bdev
2020-12-01 14:53:39 -07:00
super.c
block: remove i_bdev
2020-12-01 14:53:39 -07:00
sync.c
overlayfs update for 5.8
2020-06-09 15:40:50 -07:00
timerfd.c
…
userfaultfd.c
userfaultfd: add user-mode only option to unprivileged_userfaultfd sysctl knob
2020-12-15 12:13:46 -08:00
utimes.c
fs: expose utimes_common
2020-07-31 08:16:01 +02:00
xattr.c
vfs: move cap_convert_nscap() call into vfs_setxattr()
2020-12-14 15:26:13 +01:00