OpenSDV
/
linux-stable-rt
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
linux-stable-rt/fs
History
Oleg Nesterov 9cd80bbb07 do_wait() optimization: do not place sub-threads on task_struct->children list 
Thanks to Roland who pointed out de_thread() issues.

Currently we add sub-threads to ->real_parent->children list.  This buys
nothing but slows down do_wait().

With this patch ->children contains only main threads (group leaders).
The only complication is that forget_original_parent() should iterate over
sub-threads by hand, and de_thread() needs another list_replace() when it
changes ->group_leader.

Henceforth do_wait_thread() can never see task_detached() && !EXIT_DEAD
tasks, we can remove this check (and we can unify do_wait_thread() and
ptrace_do_wait()).

This change can confuse the optimistic search in mm_update_next_owner(),
but this is fixable and minor.

Perhaps badness() and oom_kill_process() should be updated, but they
should be fixed in any case.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Ratan Nalumasu <rnalumasu@gmail.com>
Cc: Vitaly Mayatskikh <vmayatsk@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2009-12-17 15:45:31 -08:00
..
9p 9p: fix build breakage introduced by FS-Cache 2009-12-01 07:35:11 -08:00
adfs
…
affs
…
afs afs: remove manual O_SYNC handling 2009-12-10 15:02:50 +01:00
autofs
…
autofs4 autofs4: always use lookup for lookup 2009-12-16 07:19:58 -08:00
befs
…
bfs
…
btrfs Revert "task_struct: make journal_info conditional" 2009-12-17 13:23:24 -08:00
cachefiles Untangling ima mess, part 2: deal with counters 2009-12-16 12:16:47 -05:00
cifs Merge branch 'for-2.6.33' of git://linux-nfs.org/~bfields/linux 2009-12-16 10:43:34 -08:00
coda sysctl: Drop & in front of every proc_handler. 2009-11-18 08:37:40 -08:00
configfs
…
cramfs
…
debugfs debugfs: fix create mutex racy fops and private data 2009-12-11 11:24:53 -08:00
devpts devpts_get_tty() should validate inode 2009-12-11 15:18:05 -08:00
dlm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm 2009-12-10 09:33:59 -08:00
ecryptfs fsstack/ecryptfs: remove unused get_nlinks param to fsstack_copy_attr_all 2009-12-17 10:57:30 -05:00
efs
…
exofs exofs: Multi-device mirror support 2009-12-10 09:59:23 +02:00
exportfs nfs: new subdir Documentation/filesystems/nfs 2009-10-27 19:34:04 -04:00
ext2 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-12-16 12:04:02 -08:00
ext3 sanitize xattr handler prototypes 2009-12-16 12:16:49 -05:00
ext4 Revert "task_struct: make journal_info conditional" 2009-12-17 13:23:24 -08:00
fat Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6 2009-12-16 10:29:26 -08:00
freevxfs
…
fscache FS-Cache: Avoid maybe-used-uninitialised warning on variable 2009-12-16 07:20:13 -08:00
fuse fuse: reject O_DIRECT flag also in fuse_create 2009-11-27 16:37:13 +01:00
gfs2 Revert "task_struct: make journal_info conditional" 2009-12-17 13:23:24 -08:00
hfs hfs: fix a potential buffer overflow 2009-12-15 08:53:10 -08:00
hfsplus hfsplus: refuse to mount volumes larger than 2TB 2009-10-29 07:39:27 -07:00
hostfs
…
hpfs hpfs: use bitmap_weight() 2009-12-16 07:20:06 -08:00
hppfs
…
hugetlbfs Untangling ima mess, part 1: alloc_file() 2009-12-16 12:16:47 -05:00
isofs Merge branch 'for-2.6.33' of git://linux-nfs.org/~bfields/linux 2009-12-16 10:43:34 -08:00
jbd Revert "task_struct: make journal_info conditional" 2009-12-17 13:23:24 -08:00
jbd2 Revert "task_struct: make journal_info conditional" 2009-12-17 13:23:24 -08:00
jffs2 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-12-16 12:04:02 -08:00
jfs kill I_LOCK 2009-12-17 11:03:25 -05:00
lockd Merge branch 'for-2.6.33' of git://linux-nfs.org/~bfields/linux 2009-12-16 10:43:34 -08:00
minix
…
ncpfs tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
nfs Revert "fix mismerge with Trond's stuff (create_mnt_ns() export is gone now)" 2009-12-17 12:51:05 -08:00
nfs_common
…
nfsd Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-12-16 12:04:02 -08:00
nilfs2 Revert "task_struct: make journal_info conditional" 2009-12-17 13:23:24 -08:00
nls
…
notify switch alloc_file() to passing struct path 2009-12-16 12:16:42 -05:00
ntfs kill I_LOCK 2009-12-17 11:03:25 -05:00
ocfs2 ocfs: stop using do_sync_mapping_range 2009-12-16 12:16:49 -05:00
omfs tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
openpromfs
…
partitions partitions: read whole sector with EFI GPT header 2009-11-23 09:29:58 +01:00
proc Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6 2009-12-16 12:36:49 -08:00
qnx4 qnx4: use hweight8 2009-12-16 07:20:18 -08:00
quota quota: Implement quota format with 64-bit space and inode limits 2009-12-10 15:02:54 +01:00
ramfs nommu: ramfs: remove unused local var 2009-12-17 15:45:31 -08:00
reiserfs reiserfs: truncate blocks not used by a write 2009-12-17 15:45:30 -08:00
romfs ROMFS: fix length used with romfs_dev_strnlen() function 2009-10-11 11:33:56 -07:00
smbfs
…
squashfs
…
sysfs sysfs: sysfs_setattr remove unnecessary permission check. 2009-12-11 11:24:54 -08:00
sysv
…
ubifs kill I_LOCK 2009-12-17 11:03:25 -05:00
udf udf: Avoid IO in udf_clear_inode 2009-12-14 21:40:04 +01:00
ufs ufs: NFS support 2009-12-16 07:20:06 -08:00
xfs kill I_LOCK 2009-12-17 11:03:25 -05:00
Kconfig Revert "task_struct: make journal_info conditional" 2009-12-17 13:23:24 -08:00
Kconfig.binfmt
…
Makefile
…
aio.c aio: remove unused field 2009-12-16 07:20:13 -08:00
anon_inodes.c fs: no games with DCACHE_UNHASHED 2009-12-17 10:51:40 -05:00
attr.c
…
bad_inode.c
…
binfmt_aout.c
…
binfmt_elf.c elf: kill USE_ELF_CORE_DUMP 2009-12-16 07:20:12 -08:00
binfmt_elf_fdpic.c elf: kill USE_ELF_CORE_DUMP 2009-12-16 07:20:12 -08:00
binfmt_em86.c
…
binfmt_flat.c
…
binfmt_misc.c
…
binfmt_script.c
…
binfmt_som.c Don't crap into descriptor table in binfmt_som 2009-03-31 23:00:28 -04:00
bio-integrity.c
…
bio.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-12-09 19:43:33 -08:00
block_dev.c Merge branch 'for-linus' into for-2.6.33 2009-11-03 21:14:39 +01:00
buffer.c
…
char_dev.c
…
compat.c compat.c: Remove dependence on nfsd private headers 2009-12-14 18:12:10 -05:00
compat_binfmt_elf.c
…
compat_ioctl.c md: move compat_ioctl handling into md.c 2009-12-14 12:51:41 +11:00
dcache.c libfs: move EXPORT_SYMBOL for d_alloc_name 2009-12-16 12:16:48 -05:00
dcookies.c
…
direct-io.c dio: fix use-after-free 2009-12-17 04:52:13 -05:00
drop_caches.c
…
eventfd.c
…
eventpoll.c sysctl: Drop & in front of every proc_handler. 2009-11-18 08:37:40 -08:00
exec.c do_wait() optimization: do not place sub-threads on task_struct->children list 2009-12-17 15:45:31 -08:00
fcntl.c fcntl: rename F_OWNER_GID to F_OWNER_PGRP 2009-11-17 17:40:33 -08:00
fifo.c
…
file.c headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
file_table.c re-export alloc_file() 2009-12-16 13:29:19 -08:00
filesystems.c
…
fs-writeback.c writeback: remove unused nonblocking and congestion checks 2009-12-03 13:54:25 +01:00
fs_struct.c
…
generic_acl.c make generic_acl slightly more generic 2009-12-16 12:16:49 -05:00
inode.c kill I_LOCK 2009-12-17 11:03:25 -05:00
internal.h fs: move get_empty_filp() deffinition to internal.h 2009-12-16 12:16:45 -05:00
ioctl.c __generic_block_fiemap(): fix for files bigger than 4GB 2009-11-12 07:26:01 -08:00
ioprio.c
…
libfs.c libfs: move EXPORT_SYMBOL for d_alloc_name 2009-12-16 12:16:48 -05:00
locks.c
…
mbcache.c
…
mpage.c
…
namei.c vfs: remove extraneous NULL d_inode check from do_filp_open 2009-12-17 10:52:34 -05:00
namespace.c Revert "fix mismerge with Trond's stuff (create_mnt_ns() export is gone now)" 2009-12-17 12:51:05 -08:00
nfsctl.c vfs: nfsctl.c un-used nfsd #includes 2009-12-14 18:12:11 -05:00
no-block.c
…
open.c Untangling ima mess, part 2: deal with counters 2009-12-16 12:16:47 -05:00
pipe.c fs: no games with DCACHE_UNHASHED 2009-12-17 10:51:40 -05:00
pnode.c
…
pnode.h
…
posix_acl.c
…
read_write.c sendfile(): check f_op.splice_write() rather than f_op.sendpage() 2009-11-04 09:09:52 +01:00
read_write.h
…
readdir.c
…
select.c
…
seq_file.c
…
signalfd.c
…
splice.c sendfile(): check f_op.splice_write() rather than f_op.sendpage() 2009-11-04 09:09:52 +01:00
stack.c VFS/fsstack: handle 32-bit smp + preempt + large files in fsstack_copy_inode_size 2009-12-17 10:58:17 -05:00
stat.c
…
super.c
…
sync.c fold do_sync_file_range into sys_sync_file_range 2009-12-17 11:03:25 -05:00
timerfd.c
…
utimes.c
…
xattr.c sanitize xattr handler prototypes 2009-12-16 12:16:49 -05:00
xattr_acl.c VFS: Use GFP_NOFS in posix_acl_from_xattr() 2009-12-03 11:48:07 +00:00