Eric W. Biederman 99f8955183 [PATCH] proc: don't lock task_structs indefinitely ... Every inode in /proc holds a reference to a struct task_struct. If a directory or file is opened and remains open after the the task exits this pinning continues. With 8K stacks on a 32bit machine the amount pinned per file descriptor is about 10K. Normally I would figure a reasonable per user process limit is about 100 processes. With 80 processes, with a 1000 file descriptors each I can trigger the 00M killer on a 32bit kernel, because I have pinned about 800MB of useless data. This patch replaces the struct task_struct pointer with a pointer to a struct task_ref which has a struct task_struct pointer. The so the pinning of dead tasks does not happen. The code now has to contend with the fact that the task may now exit at any time. Which is a little but not muh more complicated. With this change it takes about 1000 processes each opening up 1000 file descriptors before I can trigger the OOM killer. Much better. [mlp@google.com: task_mmu small fixes] Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Paul Jackson <pj@sgi.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Albert Cahalan <acahalan@gmail.com> Signed-off-by: Prasanna Meda <mlp@google.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		2006-06-26 09:58:25 -07:00
..
9p	Merge git://git.linux-nfs.org/pub/linux/nfs-2.6	2006-06-25 10:54:14 -07:00
adfs	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
affs	[PATCH] fix %s in affs_fill_super()	2006-06-25 10:01:22 -07:00
afs	[PATCH] fs: use list_move()	2006-06-26 09:58:18 -07:00
autofs	[PATCH] VFS: Permit filesystem to override root dentry on mount	2006-06-23 07:42:45 -07:00
autofs4	[PATCH] fs: use list_move()	2006-06-26 09:58:18 -07:00
befs	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
bfs	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
cifs	Merge branch 'master' of /home/trondmy/kernel/linux-2.6/	2006-06-24 13:07:53 -04:00
coda	[PATCH] use list_add_tail() instead of list_add()	2006-06-26 09:58:17 -07:00
configfs	[PATCH] fs: use list_move()	2006-06-26 09:58:18 -07:00
cramfs	[PATCH] read_mapping_page for address space	2006-06-23 07:43:02 -07:00
debugfs	Merge branch 'master' of /home/trondmy/kernel/linux-2.6/	2006-06-24 13:07:53 -04:00
devfs	[PATCH] VFS: Permit filesystem to override root dentry on mount	2006-06-23 07:42:45 -07:00
devpts	[PATCH] VFS: Permit filesystem to override root dentry on mount	2006-06-23 07:42:45 -07:00
efs	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
exportfs	[PATCH] NFS server subtree_check returns dubious value	2006-05-21 12:59:16 -07:00
ext2	[PATCH] ext2: cleanup: put_page and comment fix	2006-06-25 10:01:25 -07:00
ext3	[PATCH] ext3: Add "-o bh" option	2006-06-26 09:58:20 -07:00
fat	[PATCH] fs/fat/misc.c: unexport fat_sync_bhs	2006-06-23 07:43:03 -07:00
freevxfs	[PATCH] fs/freevxfs: cleanup of spelling errors	2006-06-25 10:01:01 -07:00
fuse	Merge git://git.linux-nfs.org/pub/linux/nfs-2.6	2006-06-25 10:54:14 -07:00
hfs	[PATCH] read_mapping_page for address space	2006-06-23 07:43:02 -07:00
hfsplus	[PATCH] read_mapping_page for address space	2006-06-23 07:43:02 -07:00
hostfs	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
hpfs	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
hppfs	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
hugetlbfs	[PATCH] tightening hugetlb strict accounting	2006-06-23 07:42:48 -07:00
isofs	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
jbd	[PATCH] ext3: fix memory leak when the journal file is corrupted	2006-06-25 10:01:07 -07:00
jffs	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
jffs2	[PATCH] fs: use list_move()	2006-06-26 09:58:18 -07:00
jfs	[PATCH] read_mapping_page for address space	2006-06-23 07:43:02 -07:00
lockd	NLM: Fix reclaim races	2006-06-09 09:40:27 -04:00
minix	[PATCH] read_mapping_page for address space	2006-06-23 07:43:02 -07:00
msdos	[PATCH] VFS: Permit filesystem to override root dentry on mount	2006-06-23 07:42:45 -07:00
ncpfs	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
nfs	Fix NFS2 compile error	2006-06-25 12:30:33 -07:00
nfs_common
nfsd	[PATCH] fs: use list_move()	2006-06-26 09:58:18 -07:00
nls	[PATCH] fs: Use ARRAY_SIZE macro	2006-03-24 07:33:19 -08:00
ntfs	[PATCH] Prepare for __copy_from_user_inatomic to not zero missed bytes	2006-06-25 10:01:09 -07:00
ocfs2	[PATCH] fs: use list_move()	2006-06-26 09:58:18 -07:00
openpromfs	[PATCH] openpromfs: factorize out	2006-06-25 10:01:05 -07:00
partitions	[PATCH] make kernel warn about incorrectly sized partitions	2006-06-23 07:43:09 -07:00
proc	[PATCH] proc: don't lock task_structs indefinitely	2006-06-26 09:58:25 -07:00
qnx4	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
ramfs	[PATCH] VFS: Permit filesystem to override root dentry on mount	2006-06-23 07:42:45 -07:00
reiserfs	[PATCH] reiserfs: remove reiserfs_aio_write()	2006-06-26 09:58:19 -07:00
romfs	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
smbfs	[PATCH] fs: use list_move()	2006-06-26 09:58:18 -07:00
sysfs	[PATCH] core: use list_move()	2006-06-26 09:58:17 -07:00
sysv	[PATCH] read_mapping_page for address space	2006-06-23 07:43:02 -07:00
udf	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
ufs	[PATCH] fs/ufs/inode.c: make 2 functions static	2006-06-25 10:01:04 -07:00
vfat	[PATCH] VFS: Permit filesystem to override root dentry on mount	2006-06-23 07:42:45 -07:00
xfs	[PATCH] xfs: update ->flush method proto	2006-06-25 17:43:32 -07:00
aio.c	[PATCH] list: use list_replace_init() instead of list_splice_init()	2006-06-23 07:43:07 -07:00
attr.c	[PATCH] capable/capability.h (fs/)	2006-01-11 18:42:13 -08:00
bad_inode.c	[PATCH] Make most file operations structs in fs/ const	2006-03-28 09:16:06 -08:00
binfmt_aout.c
binfmt_elf.c	[PATCH] binflt_elf: remove more casts	2006-06-23 07:43:05 -07:00
binfmt_elf_fdpic.c	[PATCH] frv: binfmt_elf_fdpic __user annotations	2006-06-23 07:42:54 -07:00
binfmt_em86.c
binfmt_flat.c	[PATCH] uclinux: use PER_LINUX_32BIT in binfmt_flat	2006-06-25 21:04:24 -07:00
binfmt_misc.c	Merge branch 'master' of /home/trondmy/kernel/linux-2.6/	2006-06-24 13:07:53 -04:00
binfmt_script.c
binfmt_som.c
bio.c	[PATCH] Fix missing ret assignment in __bio_map_user() error path	2006-06-17 10:52:12 -07:00
block_dev.c	[PATCH] VFS: Permit filesystem to override root dentry on mount	2006-06-23 07:42:45 -07:00
buffer.c	[PATCH] Kill PF_SYNCWRITE flag	2006-06-23 17:10:39 +02:00
char_dev.c	[PATCH] Simplify proc/devices and fix early termination regression	2006-03-31 12:18:53 -08:00
compat.c	[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry	2006-06-23 07:42:45 -07:00
compat_ioctl.c	[PATCH] i4l: Gigaset drivers: add IOCTLs to compat_ioctl.h	2006-06-26 09:58:23 -07:00
dcache.c	[PATCH] core: use list_move()	2006-06-26 09:58:17 -07:00
dcookies.c	[PATCH] Use __read_mostly on some hot fs variables	2006-03-26 08:56:56 -08:00
direct-io.c	[PATCH] Kill PF_SYNCWRITE flag	2006-06-23 17:10:39 +02:00
dnotify.c	[PATCH] Use __read_mostly on some hot fs variables	2006-03-26 08:56:56 -08:00
dquot.c	[PATCH] use list_add_tail() instead of list_add()	2006-06-26 09:58:17 -07:00
drop_caches.c
eventpoll.c	[PATCH] epoll: use unlocked wqueue operations	2006-06-25 10:01:13 -07:00
exec.c	[PATCH] proc: Rewrite the proc dentry flush on exit optimization	2006-06-26 09:58:24 -07:00
fcntl.c	BUG_ON() Conversion in fs/fcntl.c	2006-04-02 13:37:19 +02:00
fifo.c	[PATCH] pipe.c/fifo.c code cleanups	2006-04-11 13:53:33 +02:00
file.c	[PATCH] for_each_possible_cpu: fixes for generic part	2006-03-28 09:16:05 -08:00
file_table.c	[PATCH] percpu counter data type changes to suppport more than 2**31 ext3 free blocks counter	2006-06-23 07:43:06 -07:00
filesystems.c
fs-writeback.c	[PATCH] Kill PF_SYNCWRITE flag	2006-06-23 17:10:39 +02:00
inode.c	BUG_ON() Conversion in fs/inode.c	2006-04-02 13:38:18 +02:00
inotify.c	[PATCH] inotify (4/5): allow watch removal from event handler	2006-06-20 05:25:19 -04:00
inotify_user.c	[PATCH] VFS: Permit filesystem to override root dentry on mount	2006-06-23 07:42:45 -07:00
ioctl.c	[PATCH] capable/capability.h (fs/)	2006-01-11 18:42:13 -08:00
ioprio.c	[PATCH] lsm: add task_setioprio hook	2006-06-23 07:42:53 -07:00
Kconfig	[PATCH] nfsd kconfig: select things at the closest tristate instead of bool	2006-06-26 09:58:23 -07:00
Kconfig.binfmt
libfs.c	[PATCH] core: use list_move()	2006-06-26 09:58:17 -07:00
locks.c	[PATCH] fs/locks.c: make posix_locks_deadlock() static	2006-06-23 07:43:03 -07:00
Makefile	[PATCH] inotify (1/5): split kernel API from userspace support	2006-06-20 05:25:17 -04:00
mbcache.c	[PATCH] Typo fixes	2006-03-28 09:16:08 -08:00
mpage.c	[PATCH] writeback: fix range handling	2006-06-23 07:42:49 -07:00
namei.c	[PATCH] Implement AT_SYMLINK_FOLLOW flag for linkat	2006-06-25 10:01:22 -07:00
namespace.c	[PATCH] core: use list_move()	2006-06-26 09:58:17 -07:00
nfsctl.c	[PATCH] fs: Use ARRAY_SIZE macro	2006-03-24 07:33:19 -08:00
open.c	[PATCH] ftruncate does not always update m/ctime	2006-06-25 10:01:15 -07:00
pipe.c	[PATCH] VFS: Permit filesystem to override root dentry on mount	2006-06-23 07:42:45 -07:00
pnode.c	[PATCH] core: use list_move()	2006-06-26 09:58:17 -07:00
pnode.h
posix_acl.c
quota.c	[PATCH] sem2mutex: quota	2006-03-23 07:38:11 -08:00
quota_v1.c
quota_v2.c	[PATCH] sem2mutex: quota	2006-03-23 07:38:11 -08:00
read_write.c	[PATCH] splice: unlikely() optimizations	2006-04-11 13:56:09 +02:00
readdir.c
select.c	[PATCH] fs: sys_poll with timeout -1 bug fix	2006-06-25 10:01:22 -07:00
seq_file.c	[PATCH] sem2mutex: fs/seq_file.c	2006-03-23 07:38:12 -08:00
splice.c	[PATCH] splice: retrieve mapping after locking the page	2006-06-23 17:10:39 +02:00
stat.c	[PATCH] powerpc: Wire up *at syscalls	2006-04-28 21:04:59 +10:00
super.c	Merge branch 'master' of /home/trondmy/kernel/linux-2.6/	2006-06-24 13:07:53 -04:00
sync.c	[PATCH] writeback: fix range handling	2006-06-23 07:42:49 -07:00
xattr.c	[PATCH] log more info for directory entry change events	2006-06-20 05:25:28 -04:00
xattr_acl.c