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a562c687d1
linux/fs/ext4
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Theodore Ts'o a562c687d1 Merge branch 'rk/inode_lock' into dev 
These are ilock patches which helps improve the current inode lock scalabiliy
problem in ext4 DIO mixed read/write workload case. The problem was first
reported by Joseph [1]. This should help improve mixed read/write workload
cases for databases which use directIO.

These patches are based upon upstream discussion with Jan Kara & Joseph [2].

The problem really is that in case of DIO overwrites, we start with
a exclusive lock and then downgrade it later to shared lock. This causes a
scalability problem in case of mixed DIO read/write workload case.
i.e. if we have any ongoing DIO reads and then comes a DIO writes,
(since writes starts with excl. inode lock) then it has to wait until the
shared lock is released (which only happens when DIO read is completed).
Same is true for vice versa as well.
The same can be easily observed with perf-tools trace analysis [3].

For more details, including performance numbers, please see [4].

[1] https://lore.kernel.org/linux-ext4/1566871552-60946-4-git-send-email-joseph.qi@linux.alibaba.com/
[2] https://lore.kernel.org/linux-ext4/20190910215720.GA7561@quack2.suse.cz/
[3] https://raw.githubusercontent.com/riteshharjani/LinuxStudy/master/ext4/perf.report
[4] https://lore.kernel.org/r/20191212055557.11151-1-riteshh@linux.ibm.com
2019-12-26 10:02:07 -05:00
..
acl.c ext4: compare old and new mode before setting update_mode flag 2018-12-10 00:22:38 -05:00
acl.h ext4: fix up remaining files with SPDX cleanups 2017-12-17 22:00:59 -05:00
balloc.c ext4: clean up kerneldoc warnigns when building with W=1 2019-06-19 16:30:03 -04:00
bitmap.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
block_validity.c ext4: use RCU API in debug_print_tree 2019-12-15 21:41:04 -05:00
dir.c ext4: optimize __ext4_check_dir_entry() 2019-12-14 17:23:14 -05:00
ext4_extents.h ext4: adjust reserved cluster count when removing extents 2018-10-01 14:25:08 -04:00
ext4_jbd2.c ext4: Reserve revoke credits for freed blocks 2019-11-05 16:00:49 -05:00
ext4_jbd2.h ext4: Reserve revoke credits for freed blocks 2019-11-05 16:00:49 -05:00
ext4.h This merge window saw the the following new featuers added to ext4: 2019-11-30 10:53:02 -08:00
extents_status.c ext4: use percpu_counters for extent_status cache hits/misses 2019-08-28 11:19:23 -04:00
extents_status.h ext4: use percpu_counters for extent_status cache hits/misses 2019-08-28 11:19:23 -04:00
extents.c Merge branch 'mb/dio' into master 2019-11-05 16:21:09 -05:00
file.c ext4: Move to shared i_rwsem even without dioread_nolock mount opt 2019-12-22 23:57:27 -05:00
fsmap.c ext4: fix miscellaneous sparse warnings 2019-05-12 04:49:47 -04:00
fsmap.h ext4: fix up remaining files with SPDX cleanups 2017-12-17 22:00:59 -05:00
fsync.c ext4: update ext4_sync_file() to not use __generic_file_fsync() 2019-11-05 11:31:40 -05:00
hash.c ext4: fix kernel oops caused by spurious casefold flag 2019-09-03 01:43:17 -04:00
ialloc.c ext4: reserve revoke credits in __ext4_new_inode 2019-12-14 17:47:13 -05:00
indirect.c ext4: Reserve revoke credits for freed blocks 2019-11-05 16:00:49 -05:00
inline.c ext4: set error return correctly when ext4_htree_store_dirent fails 2019-08-12 14:29:38 -04:00
inode-test.c fs/ext4/inode-test: Fix inode test on 32 bit platforms. 2019-12-09 11:15:44 -07:00
inode.c Ext4 bug fixes (including a regression fix) for 5.5 2019-12-22 10:41:48 -08:00
ioctl.c fs: compat_ioctl: move FITRIM emulation into file systems 2019-10-23 17:23:46 +02:00
Kconfig ext4: add kunit test for decoding extended timestamps 2019-10-23 10:28:23 -06:00
Makefile ext4: add kunit test for decoding extended timestamps 2019-10-23 10:28:23 -06:00
mballoc.c ext4: clean up kerneldoc warnigns when building with W=1 2019-06-19 16:30:03 -04:00
mballoc.h ext4: fix up remaining files with SPDX cleanups 2017-12-17 22:00:59 -05:00
migrate.c ext4: Reserve revoke credits for freed blocks 2019-11-05 16:00:49 -05:00
mmp.c ext4: don't mark mmp buffer head dirty 2018-09-15 17:11:25 -04:00
move_extent.c ext4: use jbd2_inode dirty range scoping 2019-06-20 17:26:26 -04:00
namei.c ext4: fix unused-but-set-variable warning in ext4_add_entry() 2019-12-21 21:00:53 -05:00
page-io.c ext4: bio_alloc with __GFP_DIRECT_RECLAIM never fails 2019-11-14 22:19:11 -05:00
readpage.c ext4: bio_alloc with __GFP_DIRECT_RECLAIM never fails 2019-11-14 22:19:11 -05:00
resize.c ext4: Reserve revoke credits for freed blocks 2019-11-05 16:00:49 -05:00
super.c ext4: treat buffers contining write errors as valid in ext4_sb_bread() 2019-12-22 23:57:08 -05:00
symlink.c ext4: switch to fscrypt_get_symlink() 2018-01-11 22:10:40 -05:00
sysfs.c ext4: add basic fs-verity support 2019-08-12 19:33:50 -07:00
truncate.h ext4: handle layout changes to pinned DAX mappings 2018-07-29 17:00:22 -04:00
verity.c ext4: add basic fs-verity support 2019-08-12 19:33:50 -07:00
xattr_security.c ext4: use XATTR_CREATE in ext4_initxattrs() 2018-05-10 11:52:14 -04:00
xattr_trusted.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xattr_user.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xattr.c ext4: Reserve revoke credits for freed blocks 2019-11-05 16:00:49 -05:00
xattr.h ext4: add extra checks to ext4_xattr_block_get() 2018-03-30 20:04:11 -04:00