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Jan Stancek afa8b475c1 x86/timer: Force PIT initialization when !X86_FEATURE_ARAT KVM guests with commit `c8c4076723` ("x86/timer: Skip PIT initialization on modern chipsets") applied to guest kernel have been observed to have unusually higher CPU usage with symptoms of increase in vm exits for HLT and MSW_WRITE (MSR_IA32_TSCDEADLINE). This is caused by older QEMUs lacking support for X86_FEATURE_ARAT. lapic clock retains CLOCK_EVT_FEAT_C3STOP and nohz stays inactive. There's no usable broadcast device either. Do the PIT initialization if guest CPU lacks X86_FEATURE_ARAT. On real hardware it shouldn't matter as ARAT and DEADLINE come together. Fixes: `c8c4076723` ("x86/timer: Skip PIT initialization on modern chipsets") Signed-off-by: Jan Stancek <jstancek@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2019-09-08 09:01:15 +02:00
arch	x86/timer: Force PIT initialization when !X86_FEATURE_ARAT	2019-09-08 09:01:15 +02:00
block
certs
crypto
Documentation	Char/Misc driver fixes for 5.3-rc7	2019-09-02 09:30:34 -07:00
drivers	Char/Misc driver fixes for 5.3-rc7	2019-09-02 09:30:34 -07:00
fs	NFS: Fix inode fileid checks in attribute revalidation code	2019-09-02 13:10:19 -04:00
include	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2019-09-01 18:45:28 -07:00
init
ipc
kernel	sched/core: Fix uclamp ABI bug, clean up and robustify sched_read_attr() ABI logic and code	2019-09-04 19:51:30 +02:00
lib
LICENSES
mm
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2019-09-01 18:45:28 -07:00
samples
scripts
security	keys: Fix missing null pointer check in request_key_auth_describe()	2019-09-05 14:19:25 -07:00
sound	sound fixes for 5.3-rc8	2019-09-05 10:26:20 -07:00
tools	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2019-09-01 18:45:28 -07:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS	Char/Misc driver fixes for 5.3-rc7	2019-09-02 09:30:34 -07:00
Makefile	Linux 5.3-rc7	2019-09-02 09:57:40 -07:00
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.