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Goldwyn Rodrigues 3eb81bbf4e btrfs: simplify inode locking for RWF_NOWAIT 
commit 9cf35f6735 upstream.

This is similar to 942491c9e6 ("xfs: fix AIM7 regression"). Apparently
our current rwsem code doesn't like doing the trylock, then lock for
real scheme. This causes extra contention on the lock and can be
measured eg. by AIM7 benchmark.  So change our read/write methods to
just do the trylock for the RWF_NOWAIT case.

Fixes: edf064e7c6 ("btrfs: nowait aio support")
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-17 19:48:32 +01:00
arch
syscalls/x86: Fix function types in COND_SYSCALL
2020-01-17 19:48:31 +01:00
block
fs: move guard_bio_eod() after bio_set_op_attrs
2020-01-17 19:48:21 +01:00
certs
PKCS#7: Refactor verify_pkcs7_signature()
2019-08-05 18:40:18 -04:00
crypto
KEYS: asymmetric: return ENOMEM if akcipher_request_alloc() fails
2019-12-31 16:46:07 +01:00
Documentation
dt-bindings: reset: Fix brcmstb-reset example
2020-01-17 19:48:29 +01:00
drivers
reset: brcmstb: Remove resource checks
2020-01-17 19:48:29 +01:00
fs
btrfs: simplify inode locking for RWF_NOWAIT
2020-01-17 19:48:32 +01:00
include
can: can_dropped_invalid_skb(): ensure an initialized headroom in outgoing CAN sk_buffs
2020-01-14 20:08:28 +01:00
init
Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
2019-09-28 08:14:15 -07:00
ipc
ipc/sem.c: convert to use built-in RCU list checking
2019-09-25 17:51:41 -07:00
kernel
bpf: cgroup: prevent out-of-order release of cgroup bpf
2020-01-17 19:48:21 +01:00
lib
sbitmap: only queue kyber's wait callback if not already active
2020-01-12 12:21:44 +01:00
LICENSES
LICENSES: Rename other to deprecated
2019-05-03 06:34:32 -06:00
mm
mm/hugetlb: defer freeing of huge pages if in non-task context
2020-01-09 10:20:07 +01:00
net
hsr: fix slab-out-of-bounds Read in hsr_debugfs_rename()
2020-01-17 19:48:32 +01:00
samples
samples: bpf: fix syscall_tp due to unused syscall
2020-01-12 12:21:26 +01:00
scripts
scripts: package: mkdebian: add missing rsync dependency
2020-01-12 12:21:35 +01:00
security
apparmor: fix aa_xattrs_match() may sleep while holding a RCU lock
2020-01-09 10:20:00 +01:00
sound
ASoC: SOF: imx8: Fix dsp_box offset
2020-01-17 19:48:19 +01:00
tools
perf vendor events s390: Remove name from L1D_RO_EXCL_WRITES description
2020-01-17 19:48:30 +01:00
usr
gen_initramfs_list.sh: fix 'bad variable name' error
2020-01-09 10:20:00 +01:00
virt
KVM: arm/arm64: Properly handle faulting of device mappings
2019-12-31 16:46:24 +01:00
.clang-format
clang-format: Update with the latest for_each macro list
2019-08-31 10:00:51 +02:00
.cocciconfig
scripts: add Linux .cocciconfig for coccinelle
2016-07-22 12:13:39 +02:00
.get_maintainer.ignore
Opt out of scripts/get_maintainer.pl
2019-05-16 10:53:40 -07:00
.gitattributes
.gitattributes: set git diff driver for C source code files
2016-10-07 18:46:30 -07:00
.gitignore
Merge tag 'modules-for-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux
2019-09-22 10:34:46 -07:00
.mailmap
Merge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
2019-11-10 13:41:59 -08:00
COPYING
COPYING: use the new text with points to the license files
2018-03-23 12:41:45 -06:00
CREDITS
MAINTAINERS: Remove Simon as Renesas SoC Co-Maintainer
2019-10-10 08:12:51 -07:00
Kbuild
kbuild: do not descend to ./Kbuild when cleaning
2019-08-21 21:03:58 +09:00
Kconfig
docs: kbuild: convert docs to ReST and rename to *.rst
2019-06-14 14:21:21 -06:00
MAINTAINERS
MAINTAINERS: Append missed file to the database
2020-01-17 19:48:28 +01:00
Makefile
Linux 5.4.12
2020-01-14 20:08:40 +01:00
README
Drop all 00-INDEX files from Documentation/
2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.
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