Johannes Weiner 64dd89ae01 mm/block/fs: remove laptop_mode ... Laptop mode was introduced to save battery, by delaying and consolidating writes and thereby maximize the time rotating hard drives wouldn't have to spin. Luckily, rotating hard drives, with their high spin-up times and power draw, are a thing of the past for battery-powered devices. Reclaim has also since changed to not write single filesystem pages anymore, and regular filesystem writeback is lumpy by design. The juice doesn't appear worth the squeeze anymore. The footprint of the feature is small, but nevertheless it's a complicating factor in mm, block, filesystems. Developers don't think about it, and it likely hasn't been tested with new reclaim and writeback changes in years. Let's sunset it. Keep the sysctl with a deprecation warning around for a few more cycles, but remove all functionality behind it. [akpm@linux-foundation.org: fix Documentation/admin-guide/laptops/index.rst] Link: https://lkml.kernel.org/r/20251216185201.GH905277@cmpxchg.org Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Suggested-by: Christoph Hellwig <hch@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Jens Axboe <axboe@kernel.dk> Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Deepanshu Kartikey <kartikey406@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2026-01-20 19:24:47 -08:00
..
9p	- fix a bug with O_APPEND in cached mode causing data to be written multiple times on server	2025-12-07 08:29:09 -08:00
adfs
affs	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
afs	Networking changes for 6.19.	2025-12-03 17:24:33 -08:00
autofs	vfs-6.19-rc1.fixes	2025-12-05 15:52:30 -08:00
befs	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
bfs	vfs-6.19-rc1.inode	2025-12-01 09:02:34 -08:00
btrfs	for-6.19-rc5-tag	2026-01-17 19:29:32 -08:00
cachefiles	vfs-6.19-rc1.directory.locking	2025-12-01 16:13:46 -08:00
ceph	We have a patch that adds an initial set of tracepoints to the MDS	2025-12-14 15:24:10 +12:00
coda	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
configfs	Some filesystems use a kinda-sorta controlled dentry refcount leak to pin	2025-12-05 14:36:21 -08:00
cramfs	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
crypto	Significant patch series in this pull request:	2025-12-06 14:01:20 -08:00
debugfs	debugfs: Fix memleak in debugfs_change_name().	2025-12-19 16:43:40 +01:00
devpts	convert devpts	2025-11-16 01:35:04 -05:00
dlm	net: Convert proto callbacks from sockaddr to sockaddr_unsized	2025-11-04 19:10:33 -08:00
ecryptfs	ecryptfs: Release lower parent dentry after creating dir	2025-12-24 13:58:04 +01:00
efivarfs	Some filesystems use a kinda-sorta controlled dentry refcount leak to pin	2025-12-05 14:36:21 -08:00
efs	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
erofs	erofs: fix file-backed mounts no longer working on EROFS partitions	2026-01-10 06:39:20 -10:00
exfat	exfat: fix remount failure in different process environments	2025-12-03 10:00:17 +09:00
exportfs
ext2	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
ext4	mm/block/fs: remove laptop_mode	2026-01-20 19:24:47 -08:00
f2fs	f2fs-for-6.19-rc1	2025-12-09 12:06:20 +09:00
fat	There are no significant series in this small merge. Please see the	2025-12-13 20:55:12 +12:00
freevxfs	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
fuse	fs/writeback: skip AS_NO_DATA_INTEGRITY mappings in wait_sb_inodes()	2026-01-19 12:30:01 -08:00
gfs2	Revert "gfs2: Fix use of bio_chain"	2026-01-12 14:58:32 +01:00
hfs	hfs/hfsplus updates for v6.19	2025-12-03 20:08:32 -08:00
hfsplus	hfs/hfsplus updates for v6.19	2025-12-03 20:08:32 -08:00
hostfs	Apart from the usual small churn, we have	2025-12-05 16:30:56 -08:00
hpfs	vfs-6.19-rc1.fs_header	2025-12-01 14:18:01 -08:00
hugetlbfs	Some filesystems use a kinda-sorta controlled dentry refcount leak to pin	2025-12-05 14:36:21 -08:00
iomap	iomap: replace folio_batch allocation with stack allocation	2025-12-15 15:17:44 +01:00
isofs	vfs-6.19-rc1.inode	2025-12-01 09:02:34 -08:00
jbd2	jbd2: fix the inconsistency between checksum and data in memory for journal sb	2025-11-26 17:05:47 -05:00
jffs2	treewide: Update email address	2026-01-11 06:09:11 -10:00
jfs	vfs-6.19-rc1.inode	2025-12-01 09:02:34 -08:00
kernfs	fs/kernfs: null-ptr deref in simple_xattrs_free()	2025-12-23 16:14:43 +01:00
lockd	nfsd-6.19 fixes:	2025-12-30 17:56:26 -08:00
minix	vfs-6.19-rc1.minix	2025-12-01 15:22:40 -08:00
netfs	netfs: Fix early read unlock of page with EOF in middle	2025-12-24 13:30:24 +01:00
nfs	NFS: Fix size read races in truncate, fallocate and copy offload	2026-01-15 14:38:25 -05:00
nfs_common	NFSD: Remove NFSERR_EAGAIN	2026-01-02 13:43:41 -05:00
nfsd	vfs-6.19-rc5.fixes	2026-01-09 05:57:57 -10:00
nilfs2	Significant patch series in this pull request:	2025-12-06 14:01:20 -08:00
nls	fs/nls: Fix inconsistency between utf8_to_utf32() and utf32_to_utf8()	2025-12-01 11:58:06 +02:00
notify	\n	2025-12-19 07:41:17 +12:00
ntfs3	Significant patch series in this merge are as follows:	2025-12-05 13:52:43 -08:00
ocfs2	There are no significant series in this small merge. Please see the	2025-12-13 20:55:12 +12:00
omfs	vfs-6.19-rc1.fs_header	2025-12-01 14:18:01 -08:00
openpromfs	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
orangefs	vfs-6.19-rc1.inode	2025-12-01 09:02:34 -08:00
overlayfs	ovl: pass original credentials, not mounter credentials during create	2025-12-05 16:16:20 -08:00
proc	mm: introduce generic lazy_mmu helpers	2026-01-20 19:24:33 -08:00
pstore	Some filesystems use a kinda-sorta controlled dentry refcount leak to pin	2025-12-05 14:36:21 -08:00
qnx4	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
qnx6	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
quota	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
ramfs	Some filesystems use a kinda-sorta controlled dentry refcount leak to pin	2025-12-05 14:36:21 -08:00
resctrl	Significant patch series in this merge are as follows:	2025-12-05 13:52:43 -08:00
romfs	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
smb	four smb3 server fixes	2026-01-02 09:24:43 -08:00
squashfs	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
sysfs	sysfs: attribute_group: enable const variants of is_visible()	2025-11-26 15:16:35 +01:00
tests
tracefs	convert tracefs	2025-11-16 01:35:03 -05:00
ubifs	This pull request contains the following changes for UBI and UBIFS:	2025-12-09 08:50:27 +09:00
udf	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
ufs	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
unicode
vboxsf	simplify vboxsf_dir_atomic_open()	2025-09-16 23:59:38 -04:00
verity	Optimize fsverity with 2-way interleaved hashing	2025-09-29 15:55:20 -07:00
xfs	mm/block/fs: remove laptop_mode	2026-01-20 19:24:47 -08:00
zonefs	vfs-6.19-rc1.inode	2025-12-01 09:02:34 -08:00
aio.c	aio: use credential guards	2025-11-04 12:36:33 +01:00
anon_inodes.c	anon_inodes: convert to FD_ADD()	2025-11-28 12:42:31 +01:00
attr.c	filelock: add struct delegated_inode	2025-11-12 09:38:34 +01:00
backing-file.c	kernel-6.19-rc1.cred	2025-12-01 13:45:41 -08:00
bad_inode.c
binfmt_elf.c	rseq: Provide and use rseq_set_ids()	2025-11-04 08:33:33 +01:00
binfmt_elf_fdpic.c
binfmt_flat.c
binfmt_misc.c	Some filesystems use a kinda-sorta controlled dentry refcount leak to pin	2025-12-05 14:36:21 -08:00
binfmt_script.c
bpf_fs_kfuncs.c
buffer.c	vfs-6.19-rc1.folio	2025-12-01 10:26:38 -08:00
char_dev.c
compat_binfmt_elf.c
coredump.c	Networking changes for 6.19.	2025-12-03 17:24:33 -08:00
d_path.c
dax.c	Significant patch series in this merge are as follows:	2025-12-05 13:52:43 -08:00
dcache.c	fuse update for 6.19	2025-12-05 15:25:13 -08:00
direct-io.c
drop_caches.c	Coccinelle-based conversion to use ->i_state accessors	2025-10-20 20:22:26 +02:00
eventfd.c	eventfd: convert do_eventfd() to FD_PREPARE()	2025-11-28 12:42:31 +01:00
eventpoll.c	eventpoll: convert do_epoll_create() to FD_PREPARE()	2025-11-28 12:42:32 +01:00
exec.c	A large overhaul of the restartable sequences and CID management:	2025-12-02 08:48:53 -08:00
fcntl.c	vfs: expose delegation support to userland	2025-11-12 09:38:37 +01:00
fhandle.c	fhandle: convert do_handle_open() to FD_ADD()	2025-11-28 12:42:31 +01:00
file.c	vfs-6.19-rc1.fd_prepare.fs	2025-12-01 17:32:07 -08:00
file_attr.c	\n	2025-12-19 07:41:17 +12:00
file_table.c	fs: update comment in init_file()	2025-10-07 12:48:33 +02:00
filesystems.c
fs-writeback.c	fs/writeback: skip AS_NO_DATA_INTEGRITY mappings in wait_sb_inodes()	2026-01-19 12:30:01 -08:00
fs_context.c
fs_dirent.c	fs: rename fs_types.h to fs_dirent.h	2025-11-05 09:51:30 +01:00
fs_parser.c
fs_pin.c
fs_struct.c	fs: inline current_umask() and move it to fs_struct.h	2025-11-05 22:51:23 +01:00
fsopen.c
init.c	vfs: make vfs_symlink break delegations on parent dir	2025-11-12 09:38:36 +01:00
inode.c	fs: Describe @isnew parameter in ilookup5_nowait()	2025-12-24 13:33:24 +01:00
internal.h	Some filesystems use a kinda-sorta controlled dentry refcount leak to pin	2025-12-05 14:36:21 -08:00
ioctl.c
Kconfig	Summary of significant series in this pull request:	2025-10-02 18:18:33 -07:00
Kconfig.binfmt
kernel_read_file.c
libfs.c	shmem: fix recovery on rename failures	2025-12-16 00:57:29 -05:00
locks.c	vfs-6.19-rc5.fixes	2026-01-09 05:57:57 -10:00
Makefile	fs: rename fs_types.h to fs_dirent.h	2025-11-05 09:51:30 +01:00
mbcache.c
mnt_idmapping.c
mount.h	fs: use boolean to indicate anonymous mount namespace	2025-11-11 10:01:31 +01:00
mpage.c	mpage: convert do_mpage_readpage() to return void type	2025-09-21 14:22:16 -07:00
namei.c	VFS: fix __start_dirop() kernel-doc warnings	2025-12-24 13:33:24 +01:00
namespace.c	vfs-6.19-rc1.fd_prepare.fs	2025-12-01 17:32:07 -08:00
nsfs.c	vfs-6.19-rc1.fd_prepare.fs	2025-12-01 17:32:07 -08:00
open.c	vfs-6.19-rc1.fd_prepare.fs	2025-12-01 17:32:07 -08:00
pidfs.c	pidfs: protect PIDFD_GET_* ioctls() via ifdef	2026-01-06 23:08:12 +01:00
pipe.c	Summary	2025-12-05 11:15:37 -08:00
pnode.c	umount_tree(): take all victims out of propagation graph at once	2025-09-15 21:26:44 -04:00
pnode.h	umount_tree(): take all victims out of propagation graph at once	2025-09-15 21:26:44 -04:00
posix_acl.c	filelock: add struct delegated_inode	2025-11-12 09:38:34 +01:00
proc_namespace.c
read_write.c
readdir.c
remap_range.c
select.c	select: Convert to scoped user access	2025-11-04 08:28:34 +01:00
seq_file.c
signalfd.c	signalfd: convert do_signalfd4() to FD_ADD()	2025-11-28 12:42:32 +01:00
splice.c	fs/splice.c: trivial fix: pipes -> pipe's	2025-11-25 10:11:16 +01:00
stack.c
stat.c
statfs.c
super.c	vfs-6.19-rc1.fixes	2025-12-05 15:52:30 -08:00
sync.c	mm/block/fs: remove laptop_mode	2026-01-20 19:24:47 -08:00
sysctls.c
timerfd.c	timerfd: convert timerfd_create() to FD_ADD()	2025-11-28 12:42:32 +01:00
userfaultfd.c	Significant patch series in this merge are as follows:	2025-12-05 13:52:43 -08:00
utimes.c	vfs-6.19-rc1.directory.delegations	2025-12-01 15:34:41 -08:00
xattr.c	filelock: add struct delegated_inode	2025-11-12 09:38:34 +01:00