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Davi Arnaut b3762bfc8d signalfd: retrieve multiple signals with one read() call 
Gathering signals in bulk enables server applications to drain a signal
queue (almost full of realtime signals) more efficiently by reducing the
syscall and file look-up overhead.

Very similar to the sigtimedwait4() call described by Niels Provos, Chuck
Lever, and Stephen Tweedie in a paper entitled "Analyzing the Overload
Behavior of a Simple Web Server".  The paper lists more details and
advantages.

Signed-off-by: Davi E. M. Arnaut <davi@haxent.com.br>
Acked-by: Davide Libenzi <davidel@xmailserver.org>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-23 20:14:14 -07:00
..
9p
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
adfs
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
affs
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
afs
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
autofs
Replace pid_t in autofs with struct pid reference
2007-05-11 08:29:36 -07:00
autofs4
Fix some coding-style errors in autofs
2007-05-11 08:29:36 -07:00
befs
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
bfs
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
cifs
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
coda
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
configfs
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
cramfs
mm: make read_cache_page synchronous
2007-05-07 12:12:51 -07:00
debugfs
remove "struct subsystem" as it is no longer needed
2007-05-02 18:57:59 -07:00
devpts
devpts: add fsnotify create event
2007-05-08 11:14:59 -07:00
dlm
Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw
2007-05-07 12:26:27 -07:00
ecryptfs
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
efs
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
exportfs
header cleaning: don't include smp_lock.h when not used
2007-05-08 11:15:07 -07:00
ext2
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
ext3
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
ext4
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
fat
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
freevxfs
freevxfs: possible null pointer dereference fix
2007-05-08 11:14:59 -07:00
fuse
fuse: delete inode on drop
2007-05-23 20:14:13 -07:00
gfs2
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
hfs
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
hfsplus
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
hostfs
uml: hostfs style fixes
2007-05-08 11:14:57 -07:00
hpfs
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
hppfs
…
hugetlbfs
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
isofs
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
jbd
fix file specification in comments
2007-05-09 08:58:16 +02:00
jbd2
fix file specification in comments
2007-05-09 08:58:16 +02:00
jffs2
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
jfs
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
lockd
NLM: Fix sparse warnings
2007-05-14 19:33:46 -04:00
minix
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
msdos
…
ncpfs
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
nfs
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
nfs_common
…
nfsd
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
nls
…
ntfs
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
ocfs2
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
openpromfs
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
partitions
partitions/LDM: build fix
2007-05-21 21:38:17 -07:00
proc
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
qnx4
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
ramfs
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
reiserfs
Missing 'const' from reiserfs MIN_KEY declaration.
2007-05-23 20:14:13 -07:00
romfs
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
smbfs
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
sysfs
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
sysv
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
udf
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
ufs
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
vfat
…
xfs
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
aio.c
signal/timer/event: KAIO eventfd support example
2007-05-11 08:29:37 -07:00
anon_inodes.c
signal/timer/event fds: anonymous inode source
2007-05-11 08:29:36 -07:00
attr.c
header cleaning: don't include smp_lock.h when not used
2007-05-08 11:15:07 -07:00
bad_inode.c
header cleaning: don't include smp_lock.h when not used
2007-05-08 11:15:07 -07:00
binfmt_aout.c
…
binfmt_elf_fdpic.c
header cleaning: don't include smp_lock.h when not used
2007-05-08 11:15:07 -07:00
binfmt_elf.c
Invalid return value of execve() resulting in oopses
2007-05-08 11:15:15 -07:00
binfmt_em86.c
header cleaning: don't include smp_lock.h when not used
2007-05-08 11:15:07 -07:00
binfmt_flat.c
…
binfmt_misc.c
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
binfmt_script.c
header cleaning: don't include smp_lock.h when not used
2007-05-08 11:15:07 -07:00
binfmt_som.c
…
bio.c
KMEM_CACHE(): simplify slab cache creation
2007-05-07 12:12:55 -07:00
block_dev.c
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
buffer.c
Fix "fs: convert core functions to zero_user_page"
2007-05-21 09:15:32 -07:00
char_dev.c
…
compat_ioctl.c
Allow compat_ioctl.c to compile without CONFIG_NET
2007-05-10 13:34:05 -07:00
compat.c
optimize compat_core_sys_select() by a using stack space for small fd sets
2007-05-23 20:14:12 -07:00
dcache.c
header cleaning: don't include smp_lock.h when not used
2007-05-08 11:15:07 -07:00
dcookies.c
…
direct-io.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial
2007-05-09 12:54:17 -07:00
dnotify.c
…
dquot.c
circular locking dependency found in QUOTA OFF
2007-05-17 05:23:05 -07:00
drop_caches.c
…
eventfd.c
eventfd use waitqueue lock ...
2007-05-18 13:09:34 -07:00
eventpoll.c
epoll: move kfree inside ep_free
2007-05-15 08:54:00 -07:00
exec.c
uselib: add missing MNT_NOEXEC check
2007-05-23 20:14:13 -07:00
fcntl.c
…
fifo.c
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
file_table.c
header cleaning: don't include smp_lock.h when not used
2007-05-08 11:15:07 -07:00
file.c
…
filesystems.c
add filesystem subtype support
2007-05-08 11:15:01 -07:00
fs-writeback.c
…
generic_acl.c
…
inode.c
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
inotify_user.c
…
inotify.c
Introduce a handy list_first_entry macro
2007-05-08 11:15:11 -07:00
internal.h
cleanup compat ioctl handling
2007-05-08 11:15:09 -07:00
ioctl.c
vfs: remove superflous sb == NULL checks
2007-05-08 11:15:02 -07:00
ioprio.c
…
Kconfig
Remove obsolete fat_cvf help text
2007-05-09 08:58:15 +02:00
Kconfig.binfmt
fs: Kill sh dependency for binfmt_flat.
2007-05-21 14:34:00 +09:00
libfs.c
fs/libfs.c: >80 columns line break fix
2007-05-09 06:44:57 +02:00
locks.c
Remove SLAB_CTOR_CONSTRUCTOR
2007-05-17 05:23:04 -07:00
Makefile
signal/timer/event: eventfd core
2007-05-11 08:29:36 -07:00
mbcache.c
…
mpage.c
consolidate generic_writepages and mpage_writepages
2007-05-11 08:29:35 -07:00
namei.c
[PATCH] complete message queue auditing
2007-05-11 05:38:26 -04:00
namespace.c
check privileges before setting mount propagation
2007-05-08 11:15:12 -07:00
nfsctl.c
…
no-block.c
…
open.c
Remove suid/sgid bits on [f]truncate()
2007-05-08 20:10:00 -07:00
pipe.c
VFS: delay the dentry name generation on sockets and pipes
2007-05-08 11:15:03 -07:00
pnode.c
Introduce a handy list_first_entry macro
2007-05-08 11:15:11 -07:00
pnode.h
…
posix_acl.c
…
quota_v1.c
…
quota_v2.c
…
quota.c
circular locking dependency found in QUOTA OFF
2007-05-17 05:23:05 -07:00
read_write.c
use use SEEK_MAX to validate user lseek arguments
2007-05-08 11:14:59 -07:00
read_write.h
…
readdir.c
ROUND_UP macro cleanup in fs/(select|compat|readdir).c
2007-05-08 11:15:09 -07:00
select.c
Style fix in fs/select.c
2007-05-09 07:10:02 +02:00
seq_file.c
…
signalfd.c
signalfd: retrieve multiple signals with one read() call
2007-05-23 20:14:14 -07:00
splice.c
[PATCH] splice: always call into page_cache_readahead()
2007-05-08 08:46:19 +02:00
stack.c
…
stat.c
header cleaning: don't include smp_lock.h when not used
2007-05-08 11:15:07 -07:00
super.c
add filesystem subtype support
2007-05-08 11:15:01 -07:00
sync.c
Remove do_sync_file_range()
2007-05-08 11:15:04 -07:00
timerfd.c
timerfd use waitqueue lock ...
2007-05-18 13:09:34 -07:00
utimes.c
utimensat implementation
2007-05-08 11:15:18 -07:00
xattr_acl.c
…
xattr.c
[PATCH] audit inode for all xattr syscalls
2007-05-11 05:38:26 -04:00