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Filename Latest commit message Latest commit date
Goldwyn Rodrigues 3eb81bbf4e btrfs: simplify inode locking for RWF_NOWAIT 
commit 9cf35f673583ccc9f3e2507498b3079d56614ad3 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
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
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
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap ARM: SoC fixes 2019-11-10 13:41:59 -08:00
COPYING
CREDITS MAINTAINERS: Remove Simon as Renesas SoC Co-Maintainer 2019-10-10 08:12:51 -07:00
Kbuild
Kconfig
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

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.