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The source for the Linux kernel used in Windows Subsystem for Linux 2 (WSL2)
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Vincent Guittot 98b0d89022 sched/pelt: Relax the sync of util_sum with util_avg 
Rick reported performance regressions in bugzilla because of cpu frequency
being lower than before:
    https://bugzilla.kernel.org/show_bug.cgi?id=215045

He bisected the problem to:
commit 1c35b07e6d ("sched/fair: Ensure _sum and _avg values stay consistent")

This commit forces util_sum to be synced with the new util_avg after
removing the contribution of a task and before the next periodic sync. By
doing so util_sum is rounded to its lower bound and might lost up to
LOAD_AVG_MAX-1 of accumulated contribution which has not yet been
reflected in util_avg.

Instead of always setting util_sum to the low bound of util_avg, which can
significantly lower the utilization of root cfs_rq after propagating the
change down into the hierarchy, we revert the change of util_sum and
propagate the difference.

In addition, we also check that cfs's util_sum always stays above the
lower bound for a given util_avg as it has been observed that
sched_entity's util_sum is sometimes above cfs one.

Fixes: 1c35b07e6d ("sched/fair: Ensure _sum and _avg values stay consistent")
Reported-by: Rick Yiu <rickyiu@google.com>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: Sachin Sant <sachinp@linux.ibm.com>
Link: https://lkml.kernel.org/r/20220111134659.24961-2-vincent.guittot@linaro.org
 		2022-01-18 12:09:58 +01:00
Documentation psi: Fix uaf issue when psi trigger is destroyed while being polled 2022-01-18 12:09:57 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
arch Rework of the MSI interrupt infrastructure: 2022-01-13 09:05:29 -08:00
block Convert xfs/iomap to use folios 2022-01-12 12:51:41 -08:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto tpmdd updates for Linux v5.17 2022-01-11 12:58:41 -08:00
drivers - qcom: misc updates to qcom-ipcc driver 2022-01-13 11:19:07 -08:00
fs dax + libnvdimm for v5.17 2022-01-12 15:46:11 -08:00
include psi: Fix uaf issue when psi trigger is destroyed while being polled 2022-01-18 12:09:57 +01:00
init Peter Zijlstra says: 2022-01-12 16:26:58 -08:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-11-20 10:35:54 -08:00
kernel sched/pelt: Relax the sync of util_sum with util_avg 2022-01-18 12:09:58 +01:00
lib Convert much of the page cache to use folios 2022-01-12 12:37:02 -08:00
mm dax + libnvdimm for v5.17 2022-01-12 15:46:11 -08:00
net TTY/Serial driver updates for 5.17-rc1 2022-01-12 11:21:52 -08:00
samples - Get rid of all the .fixup sections because this generates 2022-01-12 16:31:19 -08:00
scripts - Get rid of all the .fixup sections because this generates 2022-01-12 16:31:19 -08:00
security fs.idmapped.v5.17 2022-01-11 14:26:55 -08:00
sound sound fixes for 5.16-rc7 2021-12-23 09:55:58 -08:00
tools - Get rid of all the .fixup sections because this generates 2022-01-12 16:31:19 -08:00
usr initramfs: Check timestamp to prevent broken cpio archive 2021-10-24 13:48:40 +09:00
virt Peter Zijlstra says: 2022-01-12 16:26:58 -08:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.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 .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap media updates for v5.17-rc1 2022-01-10 18:55:43 -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 Daniel Drake to credits 2021-09-21 08:34:58 +03:00
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 Updates for the time(r) subsystem: 2022-01-13 09:02:27 -08:00
Makefile - Get rid of all the .fixup sections because this generates 2022-01-12 16:31:19 -08:00
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.