forge/linux-uconsole: Linux kernel for uConsole

Linux kernel for uConsole

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Chris Wilson a491cc8e15 drm/i915: Truly bump ready tasks ahead of busywaits In commit `b7404c7ecb` ("drm/i915: Bump ready tasks ahead of busywaits"), I tried cutting a corner in order to not install a signal for each of our dependencies, and only listened to requests on which we were intending to busywait. The compromise that was made was that instead of then being able to promote the request with a full NOSEMAPHORE like its non-busywaiting brethren, as we had not ensured we had cleared the semaphore chain, we settled for only using the NEWCLIENT boost. With an over saturated system with multiple NEWCLIENTS in flight at any time, this was found to be an inadequate promotion and left us with a much poorer scheduling order than prior to using semaphores. The outcome of this patch, is that all requests have NOSEMAPHORE priority when they have no dependencies and are ready to run and not busywait, restoring the pre-semaphore ordering on saturated systems. We can demonstrate the effect of poor scheduling order by oversaturating the system using gem_wsim on a system with multiple vcs engines (i.e running the same workloads across more clients than required for peak throughput, e.g. media_load_balance_17i7.wsim -c4 -b context): x v5.1 (normalized) + tip * fix +------------------------------------------------------------------------+ \| x \| \| x \| \| x \| \| x \| \| %x \| \| %%x \| \| %%x \| \| %%x \| \| %%x \| \| %%x \| \| %%x \| \| %%x \| \| %%x \| \| %%x \| \| %%x \| \| %#x \| \| %#x \| \| %#x \| \| %#x \| \| %#x \| \| + %#xx \| \| + %#xx \| \| + %%#xx \| \| + %%#xx \| \| + %%#xx \| \| + %%#xx \| \| + %%##x \| \| +++ %%##x \| \| +++ %%##x \| \| +++ %%##x \| \| ++++ %%##x \| \| ++++ %%##x \| \| ++++ %%##xx \| \| ++++ %###xx \| \| ++++ %###xx \| \| ++++ %###xx \| \| ++++ %###xx \| \| ++++ + %#O#xx \| \| ++++ + %#O#xx \| \| ++++++ + %#O#xx \| \| ++++++++++ %OOOxxx\| \| ++++++++++ + %#OOO#xx\| \| + ++++++++++++ ++ +++++ + ++ @@OOOO#xx\| \| \|A_\| \| \|\|__________M_______A____________________\| \| \| \|A_\| \| +------------------------------------------------------------------------+ N Min Max Median Avg Stddev x 120 0.99456 1.00628 0.999985 1.0001545 0.0024387139 + 120 0.873021 1.00037 0.884134 0.90148752 0.039190862 Difference at 99.5% confidence -0.098667 +/- 0.0110762 -9.86517% +/- 1.10745% (Student's t, pooled s = 0.0277657) % 120 0.990207 1.00165 0.9970265 0.99699748 0.0021024 Difference at 99.5% confidence -0.003157 +/- 0.000908245 -0.315651% +/- 0.0908105% (Student's t, pooled s = 0.00227678) Fixes: `b7404c7ecb` ("drm/i915: Bump ready tasks ahead of busywaits") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com> Cc: Dmitry Ermilov <dmitry.ermilov@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190515130052.4475-2-chris@chris-wilson.co.uk (cherry picked from commit `17db337f50`) Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>		2019-05-20 18:29:20 +03:00
arch	Merge branch 'akpm' (patches from Andrew)	2019-05-19 12:15:32 -07:00
block	for-5.2/block-post-20190516	2019-05-16 19:08:15 -07:00
certs	kexec, KEYS: Make use of platform keyring for signature verify	2019-02-04 17:34:07 -05:00
crypto	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2019-05-07 22:03:58 -07:00
Documentation	Merge branch 'akpm' (patches from Andrew)	2019-05-19 12:15:32 -07:00
drivers	drm/i915: Truly bump ready tasks ahead of busywaits	2019-05-20 18:29:20 +03:00
fs	This pull request contains the following fixes for UBIFS:	2019-05-19 15:22:03 -07:00
include	Merge branch 'akpm' (patches from Andrew)	2019-05-19 12:15:32 -07:00
init	initramfs: don't free a non-existent initrd	2019-05-18 15:52:26 -07:00
ipc	ipc: do cyclic id allocation for the ipc object.	2019-05-14 19:52:52 -07:00
kernel	Merge branch 'akpm' (patches from Andrew)	2019-05-19 12:15:32 -07:00
lib	slab: remove /proc/slab_allocators	2019-05-16 15:51:55 -07:00
LICENSES	LICENSES: Rename other to deprecated	2019-05-03 06:34:32 -06:00
mm	Merge branch 'akpm' (patches from Andrew)	2019-05-19 12:15:32 -07:00
net	treewide: prefix header search paths with $(srctree)/	2019-05-18 11:49:57 +09:00
samples	samples: guard sub-directories with CONFIG options	2019-05-18 11:29:01 +09:00
scripts	kconfig: use 'else ifneq' for Makefile to improve readability	2019-05-19 09:34:35 +09:00
security	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2019-05-13 15:15:00 -07:00
sound	sound fixes for 5.2-rc1	2019-05-17 13:57:54 -07:00
tools	Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-05-19 11:20:22 -07:00
usr	user/Makefile: Fix typo and capitalization in comment section	2018-12-11 00:18:03 +09:00
virt	* ARM: support for SVE and Pointer Authentication in guests, PMU improvements	2019-05-17 10:33:30 -07:00
.clang-format	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2019-04-17 11:26:25 -07:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes
.gitignore	.gitignore: exclude .get_maintainer.ignore and .gitattributes	2019-05-18 11:49:54 +09:00
.mailmap	A reasonably busy cycle for docs, including:	2019-05-08 12:42:50 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	Char/Misc driver patches for 5.1-rc1	2019-03-06 14:18:59 -08:00
Kbuild	Kbuild updates for v5.1	2019-03-10 17:48:21 -07:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	Kbuild updates for v5.2 (2nd)	2019-05-19 11:53:58 -07:00
Makefile	Linux 5.2-rc1	2019-05-19 15:47:09 -07:00
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.