Linus Torvalds
a11e1d432b
Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL ...
The poll() changes were not well thought out, and completely
unexplained. They also caused a huge performance regression, because
"->poll()" was no longer a trivial file operation that just called down
to the underlying file operations, but instead did at least two indirect
calls.
Indirect calls are sadly slow now with the Spectre mitigation, but the
performance problem could at least be largely mitigated by changing the
"->get_poll_head()" operation to just have a per-file-descriptor pointer
to the poll head instead. That gets rid of one of the new indirections.
But that doesn't fix the new complexity that is completely unwarranted
for the regular case. The (undocumented) reason for the poll() changes
was some alleged AIO poll race fixing, but we don't make the common case
slower and more complex for some uncommon special case, so this all
really needs way more explanations and most likely a fundamental
redesign.
[ This revert is a revert of about 30 different commits, not reverted
individually because that would just be unnecessarily messy - Linus ]
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-06-28 10:40:47 -07:00
fscache: Pass object size in rather than calling back for it
2018-04-06 14:05:14 +01:00
cifs: minor documentation updates
2018-06-15 02:38:07 -05:00
ipconfig: Write NTP server IPs to /proc/net/ipconfig/ntp_servers
2018-04-24 13:40:42 -04:00
Staging/IIO patches for 4.18-rc1
2018-06-09 10:32:39 -07:00
afs: Implement @sys substitution handling
2018-04-09 21:12:31 +01:00
autofs: use autofs instead of autofs4 in documentation
2018-06-07 17:34:39 -07:00
autofs: use autofs instead of autofs4 in documentation
2018-06-07 17:34:39 -07:00
autofs: use autofs instead of autofs4 in documentation
2018-06-07 17:34:39 -07:00
Tigran has moved
2017-05-12 15:57:15 -07:00
ceph: update description of some mount options
2018-06-04 20:46:02 +02:00
docs-rst: convert filesystems book to ReST
2017-05-16 08:44:08 -03:00
cramfs: rehabilitate it
2017-10-15 00:47:23 -04:00
powerpc/cell: Remove axonram driver
2018-01-28 17:00:36 +11:00
Documentation: fix selftests related file refs
2017-10-19 12:58:21 -06:00
fs/*/Kconfig: drop links to 404-compliant http://acl.bestbits.at
2018-01-01 12:45:37 -07:00
Only miscellaneous cleanups and bug fixes for ext4 this cycle.
2018-02-03 13:49:22 -08:00
f2fs: add fsync_mode=nobarrier for non-atomic files
2018-05-29 12:04:08 -07:00
fscrypt: add Speck128/256 support
2018-05-20 16:35:51 -04:00
fuse: add writeback documentation
2018-03-20 17:11:45 +01:00
GFS2: Minor improvements to comments and documentation
2018-04-12 10:07:51 -07:00
fscrypt: add a documentation file for filesystem-level encryption
2017-10-31 13:49:24 -04:00
Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL
2018-06-28 10:40:47 -07:00
MAINTAINERS, nilfs2: change project home URLs
2018-01-13 10:42:48 -08:00
Orangefs: documentation updates
2018-04-04 14:05:48 -04:00
ovl: update documentation for unionmount-testsuite
2018-05-31 11:06:10 +02:00
autofs: use autofs instead of autofs4 in documentation
2018-06-07 17:34:39 -07:00
vfs: grab the lock instead of blocking in __fd_install during resizing
2017-11-05 18:58:07 -05:00
docs/vm: move numa_memory_policy.rst to Documentation/admin-guide/mm
2018-05-08 09:31:31 -06:00
PCI: Add pci_mmap_resource_range() and use it for ARM64
2017-04-20 08:47:47 -05:00
kallsyms: remove print_symbol() function
2018-01-16 16:59:55 +01:00
docs/vm: move numa_memory_policy.rst to Documentation/admin-guide/mm
2018-05-08 09:31:31 -06:00
udf: Remove never implemented mount options
2018-02-27 10:25:33 +01:00
Documentation/filesystems/vfat.txt: fix a remark that implies UCS2
2017-12-21 13:39:28 -07:00
Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL
2018-06-28 10:40:47 -07:00
xfs: Change URL for the project in xfs.txt
2018-03-21 09:33:04 -06:00
a11e1d432b