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Mikulas Patocka 939f750215 dm writecache: don't split bios when overwriting contiguous cache content 
[ Upstream commit ee50cc19d80e9b9a8283d1fb517a778faf2f6899 ]

If dm-writecache overwrites existing cached data, it splits the
incoming bio into many block-sized bios. The I/O scheduler does merge
these bios into one large request but this needless splitting and
merging causes performance degradation.

Fix this by avoiding bio splitting if the cache target area that is
being overwritten is contiguous.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-07-19 09:44:45 +02:00
arch
MIPS: ingenic: Select CPU_SUPPORTS_CPUFREQ && MIPS_EXTERNAL_TIMER
2021-07-19 09:44:44 +02:00
block
blk-mq: update hctx->dispatch_busy in case of real scheduler
2021-07-14 16:56:13 +02:00
certs
certs: Add ability to preload revocation certs
2021-06-30 08:47:30 -04:00
crypto
crypto: sm2 - fix a memory leak in sm2
2021-07-14 16:56:06 +02:00
Documentation
powerpc/papr_scm: Make 'perf_stats' invisible if perf-stats unavailable
2021-07-14 16:56:49 +02:00
drivers
dm writecache: don't split bios when overwriting contiguous cache content
2021-07-19 09:44:45 +02:00
fs
udf: Fix NULL pointer dereference in udf_symlink function
2021-07-19 09:44:40 +02:00
include
net: mdio: provide shim implementation of devm_of_mdiobus_register
2021-07-19 09:44:39 +02:00
init
sched/core: Initialize the idle task with preemption disabled
2021-07-14 16:55:50 +02:00
ipc
ipc/mqueue, msg, sem: avoid relying on a stack reference past its expiry
2021-05-26 12:06:54 +02:00
kernel
cred: add missing return error code when set_cred_ucounts() failed
2021-07-14 16:56:55 +02:00
lib
lib/math/rational.c: fix divide by zero
2021-07-14 16:56:51 +02:00
LICENSES
LICENSES/deprecated: add Zlib license text
2020-09-16 14:33:49 +02:00
mm
mm/z3fold: use release_z3fold_page_locked() to release locked z3fold page
2021-07-14 16:56:51 +02:00
net
net: tcp better handling of reordering then loss cases
2021-07-19 09:44:45 +02:00
samples
samples/bpf: Fix the error return code of xdp_redirect's main()
2021-07-14 16:56:23 +02:00
scripts
kbuild: Fix objtool dependency for 'OBJECT_FILES_NON_STANDARD_<obj> := n'
2021-07-14 16:56:04 +02:00
security
evm: fix writing <securityfs>/evm overflow
2021-07-14 16:56:04 +02:00
sound
ALSA: firewire-lib: Fix 'amdtp_domain_start()' when no AMDTP_OUT_STREAM stream is found
2021-07-14 16:56:49 +02:00
tools
perf llvm: Return -ENOMEM when asprintf() fails
2021-07-14 16:56:52 +02:00
usr
Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-08-07 13:29:39 -07:00
virt
KVM: do not allow mapping valid but non-reference-counted pages
2021-06-30 08:47:25 -04:00
.clang-format
RDMA 5.10 pull request
2020-10-17 11:18:18 -07:00
.cocciconfig
…
.get_maintainer.ignore
Opt out of scripts/get_maintainer.pl
2019-05-16 10:53:40 -07:00
.gitattributes
.gitattributes: use 'dts' diff driver for dts files
2019-12-04 19:44:11 -08:00
.gitignore
kbuild: generate Module.symvers only when vmlinux exists
2021-05-19 10:12:59 +02:00
.mailmap
mailmap: add two more addresses of Uwe Kleine-König
2020-12-06 10:19:07 -08:00
COPYING
COPYING: state that all contributions really are covered by this file
2020-02-10 13:32:20 -08:00
CREDITS
MAINTAINERS: Move Jason Cooper to CREDITS
2020-11-30 10:20:34 +01:00
Kbuild
kbuild: rename hostprogs-y/always to hostprogs/always-y
2020-02-04 01:53:07 +09:00
Kconfig
kbuild: ensure full rebuild when the compiler is updated
2020-05-12 13:28:33 +09:00
MAINTAINERS
f2fs: move ioctl interface definitions to separated file
2021-05-19 10:13:00 +02:00
Makefile
Linux 5.10.50
2021-07-14 16:56:55 +02:00
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.
Description
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