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8314418629
linux/fs
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Rafael J. Wysocki 8314418629 Freezer: make kernel threads nonfreezable by default 
Currently, the freezer treats all tasks as freezable, except for the kernel
threads that explicitly set the PF_NOFREEZE flag for themselves.  This
approach is problematic, since it requires every kernel thread to either
set PF_NOFREEZE explicitly, or call try_to_freeze(), even if it doesn't
care for the freezing of tasks at all.

It seems better to only require the kernel threads that want to or need to
be frozen to use some freezer-related code and to remove any
freezer-related code from the other (nonfreezable) kernel threads, which is
done in this patch.

The patch causes all kernel threads to be nonfreezable by default (ie.  to
have PF_NOFREEZE set by default) and introduces the set_freezable()
function that should be called by the freezable kernel threads in order to
unset PF_NOFREEZE.  It also makes all of the currently freezable kernel
threads call set_freezable(), so it shouldn't cause any (intentional)
change of behaviour to appear.  Additionally, it updates documentation to
describe the freezing of tasks more accurately.

[akpm@linux-foundation.org: build fixes]
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Nigel Cunningham <nigel@nigel.suspend2.net>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-17 10:23:02 -07:00
..
9p 9p: re-enable mount time debug option 2007-07-14 15:14:14 -05:00
adfs sendfile: remove .sendfile from filesystems that use generic_file_sendfile() 2007-07-10 08:04:13 +02:00
affs sendfile: remove .sendfile from filesystems that use generic_file_sendfile() 2007-07-10 08:04:13 +02:00
afs AFS: drop explicit extern 2007-07-16 09:05:43 -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 sendfile: remove .sendfile from filesystems that use generic_file_sendfile() 2007-07-10 08:04:13 +02:00
cifs Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
coda wrong order of arguments of ->readdir() 2007-07-15 16:40:51 -07:00
configfs configfs: config item dependancies. 2007-07-10 17:18:59 -07:00
cramfs mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
debugfs debugfs: add rename for debugfs files 2007-07-11 16:09:00 -07:00
devpts devpts: add fsnotify create event 2007-05-08 11:14:59 -07:00
dlm configfs: Convert subsystem semaphore to mutex 2007-07-10 17:10:56 -07:00
ecryptfs sysfs: kill unnecessary attribute->owner 2007-07-11 16:09:06 -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 ext2: statfs speed up 2007-07-16 09:05:52 -07:00
ext3 ext3: statfs speed up 2007-07-16 09:05:52 -07:00
ext4 ext4: statfs speed up 2007-07-16 09:05:52 -07:00
fat fat: Fix the race of read/write the FAT12 entry 2007-07-16 10:31:01 -07:00
freevxfs vxfs warning fixes 2007-07-16 09:05:41 -07:00
fuse sendfile: remove .sendfile from filesystems that use generic_file_sendfile() 2007-07-10 08:04:13 +02:00
gfs2 Remove capability.h from mm.h 2007-07-16 09:05:45 -07:00
hfs sendfile: remove .sendfile from filesystems that use generic_file_sendfile() 2007-07-10 08:04:13 +02:00
hfsplus HFS+: add custom dentry hash and comparison operations 2007-07-16 09:05:49 -07:00
hostfs sendfile: remove .sendfile from filesystems that use generic_file_sendfile() 2007-07-10 08:04:13 +02:00
hpfs sendfile: remove .sendfile from filesystems that use generic_file_sendfile() 2007-07-10 08:04:13 +02:00
hppfs [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
hugetlbfs hugetlbfs: handle empty options string 2007-07-16 09:05:46 -07:00
isofs remove useless tolower in isofs 2007-07-16 09:05:43 -07:00
jbd is_power_of_2(): jbd 2007-07-16 09:05:48 -07:00
jbd2 is_power_of_2(): jbd 2007-07-16 09:05:48 -07:00
jffs2 Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
jfs sendfile: remove .sendfile from filesystems that use generic_file_sendfile() 2007-07-10 08:04:13 +02:00
lockd Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
minix sendfile: remove .sendfile from filesystems that use generic_file_sendfile() 2007-07-10 08:04:13 +02:00
msdos [PATCH] mark struct inode_operations const 2 2007-02-12 09:48:46 -08:00
ncpfs Only send SIGXFSZ when exceeding rlimits. 2007-07-16 09:05:43 -07:00
nfs Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
nfs_common [PATCH] nfs_common endianness annotations 2006-10-20 10:26:41 -07:00
nfsd Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
nls NLS: Remove obsolete Makefile entries 2007-07-16 09:05:52 -07:00
ntfs sendfile: remove .sendfile from filesystems that use generic_file_sendfile() 2007-07-10 08:04:13 +02:00
ocfs2 Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2 2007-07-16 10:52:55 -07:00
openpromfs Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
partitions Fix LDM for new field in the VOL5 VBLK. 2007-07-16 12:01:30 -07:00
proc Merge git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched 2007-07-16 11:02:49 -07:00
qnx4 sendfile: remove .sendfile from filesystems that use generic_file_sendfile() 2007-07-10 08:04:13 +02:00
ramfs Add __GFP_MOVABLE for callers to flag allocations from high memory that may be migrated 2007-07-17 10:22:59 -07:00
reiserfs Only send SIGXFSZ when exceeding rlimits. 2007-07-16 09:05:43 -07:00
romfs Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
smbfs sendfile: remove .sendfile from filesystems that use generic_file_sendfile() 2007-07-10 08:04:13 +02:00
sysfs sysfs: add parameter "struct bin_attribute *" in .read/.write methods for sysfs binary attributes 2007-07-11 16:09:09 -07:00
sysv sendfile: remove .sendfile from filesystems that use generic_file_sendfile() 2007-07-10 08:04:13 +02:00
udf UDF: fix function name from udf_crc16 to udf_crc 2007-07-16 09:05:51 -07:00
ufs is_power_of_2: ufs/super.c 2007-07-16 09:05:50 -07:00
vfat [PATCH] mark struct inode_operations const 3 2007-02-12 09:48:46 -08:00
xfs Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
aio.c signal/timer/event: KAIO eventfd support example 2007-05-11 08:29:37 -07:00
anon_inodes.c Fix trivial typos in anon_inodes.c comments 2007-07-16 09:05:52 -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 sendfile: remove bad_sendfile() from bad_file_ops 2007-07-10 08:04:15 +02:00
binfmt_aout.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
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 binfmt_elf warning fix 2007-07-16 09:05:47 -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 nommu: report correct errno in message 2007-06-08 17:23:32 -07:00
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 [PARISC] Fix fs/binfmt_som.c 2006-10-04 06:51:26 -06:00
bio.c unexport bio_{,un}map_user 2007-07-10 08:03:34 +02:00
block_dev.c bd_claim_by_disk: fix warning 2007-07-16 09:05:50 -07:00
buffer.c fs: introduce some page/buffer invariants 2007-07-17 10:23:02 -07:00
char_dev.c [PATCH] remove protection of LANANA-reserved majors 2007-04-04 21:12:47 -07:00
compat_ioctl.c compat32: ignore the LOOP_CLR_FD ioctl 2007-07-16 09:05:52 -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 mm: clean up and kernelify shrinker registration 2007-07-17 10:23:00 -07:00
dcookies.c [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
direct-io.c dio: remove bogus refcounting BUG_ON 2007-07-03 18:23:23 -07:00
dnotify.c [PATCH] VFS: change struct file to use struct path 2006-12-08 08:28:41 -08:00
dquot.c mm: clean up and kernelify shrinker registration 2007-07-17 10:23:00 -07:00
drop_caches.c invalidate_mapping_pages(): add cond_resched 2007-07-16 09:05:36 -07:00
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 [PATCH] fdtable: Make fdarray and fdsets equal in size 2006-12-10 09:57:22 -08:00
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 [PATCH] fdtable: Provide free_fdtable() wrapper 2006-12-22 08:55:50 -08:00
filesystems.c add filesystem subtype support 2007-05-08 11:15:01 -07:00
fs-writeback.c Write back inode data pages even when the inode itself is locked 2007-01-26 12:53:20 -08:00
generic_acl.c [PATCH] Generic infrastructure for acls 2006-09-29 09:18:24 -07:00
inode.c mm: clean up and kernelify shrinker registration 2007-07-17 10:23:00 -07:00
inotify_user.c [PATCH] inotify: read return val fix 2007-02-12 09:48:28 -08:00
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 drop obsolete sys_ioctl export 2007-07-16 09:05:48 -07:00
ioprio.c [PATCH] pid: replace do/while_each_task_pid with do/while_each_pid_task 2007-02-12 09:48:32 -08:00
Kconfig Merge master.kernel.org:/pub/scm/linux/kernel/git/lethal/sh-2.6 2007-07-16 10:32:02 -07:00
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 mm: clean up and kernelify shrinker registration 2007-07-17 10:23:00 -07:00
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 fs/namespace.c should #include "internal.h" 2007-07-16 09:05:50 -07:00
nfsctl.c
no-block.c [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 2006-09-30 20:52:31 +02:00
open.c O_CLOEXEC for SCM_RIGHTS 2007-07-16 09:05:45 -07:00
pipe.c pipe: add documentation and comments 2007-07-10 08:04:16 +02:00
pnode.c Introduce a handy list_first_entry macro 2007-05-08 11:15:11 -07:00
pnode.h [PATCH] rename struct namespace to struct mnt_namespace 2006-12-08 08:28:51 -08:00
posix_acl.c [PATCH] kmemdup: some users 2006-10-01 00:39:19 -07:00
quota_v1.c
quota_v2.c
quota.c diskquota: 32bit quota tools on 64bit architectures 2007-07-16 09:05:48 -07:00
read_write.c Remove remnants of sendfile() 2007-07-10 08:04:15 +02:00
read_write.h [PATCH] Remove readv/writev methods and use aio_read/aio_write instead 2006-10-01 00:39:28 -07:00
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 seq_file: more atomicity in traverse() 2007-07-16 09:05:45 -07:00
signalfd.c avoid spurious POLLIN returns in signalfd 2007-06-28 11:34:54 -07:00
splice.c splice: direct splicing updates ppos twice 2007-07-16 15:02:48 +02:00
stack.c [PATCH] fs/stack.c: Copy i_nlink after all other attributes are copied 2007-02-19 14:21:50 -08:00
stat.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
super.c hugetlbfs: handle empty options string 2007-07-16 09:05:46 -07:00
sync.c Introduce fixed sys_sync_file_range2() syscall, implement on PowerPC and ARM 2007-06-28 11:38:30 -07:00
timerfd.c timerfd use waitqueue lock ... 2007-05-18 13:09:34 -07:00
utimes.c utime(s): Honour CAP_FOWNER when times==NULL 2007-07-16 12:14:08 -07:00
xattr_acl.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
xattr.c [PATCH] audit inode for all xattr syscalls 2007-05-11 05:38:26 -04:00