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Filename Latest commit message Latest commit date
Kai Krakow de5510b982 Revert "bcache: Kill btree_io_wq" 
commit 9f233ffe02e5cef611100cd8c5bcf4de26ca7bef upstream.

This reverts commit 56b30770b2.

With the btree using the `system_wq`, I seem to see a lot more desktop
latency than I should.

After some more investigation, it looks like the original assumption
of 56b3077 no longer is true, and bcache has a very high potential of
congesting the `system_wq`. In turn, this introduces laggy desktop
performance, IO stalls (at least with btrfs), and input events may be
delayed.

So let's revert this. It's important to note that the semantics of
using `system_wq` previously mean that `btree_io_wq` should be created
before and destroyed after other bcache wqs to keep the same
assumptions.

Cc: Coly Li <colyli@suse.de>
Cc: stable@vger.kernel.org # 5.4+
Signed-off-by: Kai Krakow <kai@kaishome.de>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-04 10:26:42 +01:00
arch arm64: Add missing ISB after invalidating TLB in __primary_switch 2021-03-04 10:26:39 +01:00
block blk-settings: align max_sectors on "logical_block_size" boundary 2021-03-04 10:26:40 +01:00
certs certs: Fix blacklist flag type confusion 2021-03-04 10:26:29 +01:00
crypto crypto: ecdh_helper - Ensure 'len >= secret.len' in decode_key() 2021-03-04 10:26:25 +01:00
Documentation
drivers Revert "bcache: Kill btree_io_wq" 2021-03-04 10:26:42 +01:00
fs ocfs2: fix a use after free on error 2021-03-04 10:26:39 +01:00
include mm/rmap: fix potential pte_unmap on an not mapped pte 2021-03-04 10:26:40 +01:00
init
ipc
kernel tracepoint: Do not fail unregistering a probe due to memory failure 2021-03-04 10:26:32 +01:00
lib
LICENSES
mm mm/compaction: fix misbehaviors of fast_find_migrateblock() 2021-03-04 10:26:39 +01:00
net bpf: Fix bpf_fib_lookup helper MTU check for SKB ctx 2021-03-04 10:26:17 +01:00
samples
scripts scripts/recordmcount.pl: support big endian for ARCH sh 2021-02-26 10:10:28 +01:00
security certs: Fix blacklist flag type confusion 2021-03-04 10:26:29 +01:00
sound ALSA: hda/realtek: modify EAPD in the ALC886 2021-03-04 10:26:42 +01:00
tools perf test: Fix unaligned access in sample parsing test 2021-03-04 10:26:35 +01:00
usr
virt
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Makefile Linux 5.4.101 2021-02-26 10:10:28 +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.