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Davidlohr Bueso a5091fda4e ipc/mqueue: optimize msg_get() 
Our msg priorities became an rbtree as of d6629859b3 ("ipc/mqueue:
improve performance of send/recv").  However, consuming a msg in
msg_get() remains logarithmic (still being better than the case before
of course).  By applying well known techniques to cache pointers we can
have the node with the highest priority in O(1), which is specially nice
for the rt cases.  Furthermore, some callers can call msg_get() in a
loop.

A new msg_tree_erase() helper is also added to encapsulate the tree
removal and node_cache game.  Passes ltp mq testcases.

Link: http://lkml.kernel.org/r/20190321190216.1719-2-dave@stgolabs.net
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-05-14 19:52:52 -07:00
arch xtensa: replace CONFIG_DEBUG_KERNEL with CONFIG_DEBUG_MISC 2019-05-14 19:52:50 -07:00
block
certs
crypto
Documentation dt-bindings: pps: pps-gpio PPS ECHO implementation 2019-05-14 19:52:51 -07:00
drivers pps: pps-gpio PPS ECHO implementation 2019-05-14 19:52:51 -07:00
fs fs/eventfd.c: make eventfd_ida static 2019-05-14 19:52:51 -07:00
include pps: pps-gpio PPS ECHO implementation 2019-05-14 19:52:51 -07:00
init mm: shuffle initial free memory to improve memory-side-cache utilization 2019-05-14 19:52:48 -07:00
ipc ipc/mqueue: optimize msg_get() 2019-05-14 19:52:52 -07:00
kernel panic/reboot: allow specifying reboot_mode for panic only 2019-05-14 19:52:51 -07:00
lib tools/testing/selftests/sysctl/sysctl.sh: add proc_do_large_bitmap() test case 2019-05-14 19:52:51 -07:00
LICENSES
mm mm/mincore.c: make mincore() more conservative 2019-05-14 19:52:48 -07:00
net net: replace CONFIG_DEBUG_KERNEL with CONFIG_DEBUG_MISC 2019-05-14 19:52:50 -07:00
samples samples: add .gitignore for pidfd-metadata 2019-05-10 11:50:52 +02:00
scripts scripts/gdb: print cached rate in lx-clk-summary 2019-05-14 19:52:52 -07:00
security Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-05-13 15:15:00 -07:00
sound sound updates for 5.2-rc1 2019-05-09 08:26:55 -07:00
tools tools/testing/selftests/sysctl/sysctl.sh: add proc_do_large_bitmap() test case 2019-05-14 19:52:51 -07:00
usr
virt mm/mmu_notifier: convert user range->blockable to helper function 2019-05-14 09:47:49 -07:00
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MAINTAINERS - Core Frameworks 2019-05-14 10:39:08 -07:00
Makefile
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.