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Filename Latest commit message Latest commit date
Paul E. McKenney 0497b489b8 srcu: Expedite srcu_schedule_cbs_snp() callback invocation
Although Tree SRCU does reduce delays when there is at least one
synchronize_srcu_expedited() invocation pending, srcu_schedule_cbs_snp()
still waits for SRCU_INTERVAL before invoking callbacks.  Since
synchronize_srcu_expedited() now posts a callback and waits for
that callback to do a wakeup, this destroys the expedited nature of
synchronize_srcu_expedited().  This destruction became apparent to
Marc Zyngier in the guise of a guest-OS bootup slowdown from five
seconds to no fewer than forty seconds.

This commit therefore invokes callbacks immediately at the end of the
grace period when there is at least one synchronize_srcu_expedited()
invocation pending.  This brought Marc's guest-OS bootup times back
into the realm of reason.

Reported-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Marc Zyngier <marc.zyngier@arm.com>
2017-04-21 05:59:27 -07:00
arch rcu: Make arch select smp_mb__after_unlock_lock() strength 2017-04-18 11:20:15 -07:00
block blk: improve order of bio handling in generic_make_request() 2017-03-08 10:55:17 -07:00
certs
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2017-03-04 10:42:53 -08:00
Documentation rcu: Place guard on rcu_all_qs() and rcu_note_context_switch() actions 2017-04-18 11:38:18 -07:00
drivers Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-03-12 14:11:38 -07:00
firmware
fs Merge branch 'prep-for-5level' 2017-03-10 08:59:07 -08:00
include srcu: Parallelize callback handling 2017-04-21 05:59:26 -07:00
init srcu: Introduce CLASSIC_SRCU Kconfig option 2017-04-18 11:38:23 -07:00
ipc Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-03-03 10:16:38 -08:00
kernel srcu: Expedite srcu_schedule_cbs_snp() callback invocation 2017-04-21 05:59:27 -07:00
lib mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
mm mm: Use static initialization for "srcu" 2017-04-18 11:38:22 -07:00
net libceph: osd_request_timeout option 2017-03-07 14:30:38 +01:00
samples Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-03-03 11:38:56 -08:00
scripts Merge branch 'akpm' (patches from Andrew) 2017-03-10 08:34:42 -08:00
security Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-03-03 10:16:38 -08:00
sound scripts/spelling.txt: add "disble(d)" pattern and fix typo instances 2017-03-09 17:01:09 -08:00
tools userfaultfd: selftest: vm: allow to build in vm/ directory 2017-03-09 17:01:10 -08:00
usr
virt KVM: arm/arm64: VGIC: Fix command handling while ITS being disabled 2017-03-07 15:44:08 +00:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS MAINTAINERS: usb251xb: remove reference inexistent file 2017-03-09 10:34:16 +01:00
Makefile Linux 4.11-rc2 2017-03-12 14:47:08 -07:00
README

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.