linux/fs/nfs
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
..
callback_proc.c [PATCH] fs/nfs/callback* passes error values big-endian 2006-10-20 10:26:40 -07:00
callback_xdr.c [PATCH] knfsd: SUNRPC: Provide room in svc_rqst for larger addresses 2007-02-12 09:48:36 -08:00
callback.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
callback.h NFS: Fix more sparse warnings 2007-05-14 19:33:46 -04:00
client.c Make NFS client use seq_list_xxx helpers 2007-07-16 09:05:42 -07:00
delegation.c NFSv4: Defer inode revalidation when setting up a delegation 2007-07-10 23:40:41 -04:00
delegation.h NFSv4: Use RCU to protect delegations 2007-07-10 23:40:41 -04:00
dir.c NFS: Fix an Oops in the nfs_access_cache_shrinker() 2007-07-10 23:40:25 -04:00
direct.c NFS: Replace vfsmount and dentry in nfs_open_context with struct path 2007-07-10 23:40:23 -04:00
file.c sendfile: convert nfs to using splice_read() 2007-07-10 08:04:14 +02:00
getroot.c NFS: Kill the obsolete NFS_PARANOIA 2007-05-09 17:58:01 -04:00
idmap.c NFS: use __set_current_state() 2007-05-09 17:58:01 -04:00
inode.c NFSv4: Defer inode revalidation when setting up a delegation 2007-07-10 23:40:41 -04:00
internal.h NFS: Clean-up: use correct type when converting NFS blocks to local blocks 2007-07-10 23:40:44 -04:00
iostat.h NFSv4: Fix an oops in nfs4_fill_super 2006-03-20 13:44:48 -05:00
Makefile NFS: Remake nfsroot_mount as a permanent part of NFS client 2007-07-10 23:40:46 -04:00
mount_clnt.c NFS: Improve debugging output in NFS in-kernel mount client 2007-07-10 23:40:47 -04:00
namespace.c [PATCH] mark struct inode_operations const 2 2007-02-12 09:48:46 -08:00
nfs2xdr.c SUNRPC: Remove the tk_auth macro... 2007-07-10 23:40:37 -04:00
nfs3acl.c NFSv3: Client-side nfsacl caching fix 2006-06-09 09:34:11 -04:00
nfs3proc.c NFS: nfs3_proc_create() should use nfs_post_op_update_inode() 2007-07-10 23:40:25 -04:00
nfs3xdr.c SUNRPC: Remove the tk_auth macro... 2007-07-10 23:40:37 -04:00
nfs4_fs.h NFSv4: Make the NFS state model work with the nosharedcache mount option 2007-07-10 23:40:48 -04:00
nfs4namespace.c NFSv4: /proc/mounts displays the wrong server name for referrals 2007-02-03 15:35:10 -08:00
nfs4proc.c NFSv4: Make sure unlock is really an unlock when cancelling a lock 2007-07-10 23:40:49 -04:00
nfs4renewd.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
nfs4state.c NFSv4: Make the NFS state model work with the nosharedcache mount option 2007-07-10 23:40:48 -04:00
nfs4xdr.c NFSv4: Reduce the chances of an open_owner identifier collision 2007-07-10 23:40:39 -04:00
nfsroot.c NFS: Remake nfsroot_mount as a permanent part of NFS client 2007-07-10 23:40:46 -04:00
pagelist.c NFS: Replace NFS_I(inode)->req_lock with inode->i_lock 2007-07-10 23:40:38 -04:00
proc.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
read.c NFS: Replace vfsmount and dentry in nfs_open_context with struct path 2007-07-10 23:40:23 -04:00
super.c mm: clean up and kernelify shrinker registration 2007-07-17 10:23:00 -07:00
symlink.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
sysctl.c [PATCH] nfs: fix congestion control 2007-03-16 19:25:05 -07:00
unlink.c NFS: kzalloc conversion in fs/nfs 2006-03-20 13:44:10 -05:00
write.c NFS: Replace NFS_I(inode)->req_lock with inode->i_lock 2007-07-10 23:40:38 -04:00