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Roger Pau Monné ee74891fc7 blkfront: add support for unmapped IO
Using unmapped IO is really beneficial when running inside of a VM,
since it avoids IPIs to other vCPUs in order to invalidate the
mappings.

This patch adds unmapped IO support to blkfront. The following tests
results have been obtained when running on a Xen host without HAP:

PVHVM
     3165.84 real      6354.17 user      4483.32 sys
PVHVM with unmapped IO
     2099.46 real      4624.52 user      2967.38 sys

This is because when running using shadow page tables TLB flushes and
range invalidations are much more expensive, so using unmapped IO
provides a very important performance boost.

Sponsored by:	Citrix Systems R&D
MFC after:	2 weeks
X-MFC-with:	r289834
2015-10-23 15:46:42 +00:00
bin Fix a ton of speelling errors 2015-10-21 05:37:09 +00:00
cddl MFV r289561: 6328 Fix cstyle errors in zfs codebase 2015-10-19 08:25:37 +00:00
contrib MFV ntp-4.2.8p4 (r289715) 2015-10-22 19:42:57 +00:00
crypto
etc Correctly reintroduce the rudimentary smoke tests I botched up 2015-10-22 05:32:45 +00:00
gnu Remove disconnected xditview. 2015-10-21 01:34:51 +00:00
include Add more SUBDIR_PARALLEL. 2015-10-15 22:55:08 +00:00
kerberos5
lib figpar(3) merged to stable/10 before release/10.2.0 2015-10-23 07:37:27 +00:00
libexec
release Deprecate MD5 checksum generation in favor of SHA512. 2015-10-14 22:33:11 +00:00
rescue Make iscsictl and iscsid build if MK_ISCSI == yes 2015-10-17 21:11:42 +00:00
sbin sysctl(8): Fix style nits 2015-10-23 15:40:44 +00:00
secure Add more SUBDIR_PARALLEL. 2015-10-15 22:55:08 +00:00
share sysctl(9): Document U8/U16 types from r289773 2015-10-23 15:08:16 +00:00
sys blkfront: add support for unmapped IO 2015-10-23 15:46:42 +00:00
targets Remove more disconnected libgpib items missed in r276214. 2015-10-22 03:51:25 +00:00
tests Add tests for the copyin(9) handling of illegal buffers. 2015-10-19 20:22:17 +00:00
tools Fix warning about redefined *_crunchdir_hostname target after r289734. 2015-10-22 18:05:11 +00:00
usr.bin dpv(1) merged to stable/10 before release/10.2.0 2015-10-23 07:38:34 +00:00
usr.sbin A miss from r289764. 2015-10-23 05:03:34 +00:00
.arcconfig
.arclint
COPYRIGHT
LOCKS
MAINTAINERS
Makefile Rework the 'make -n -n' feature such that '-n' recurses and '-N' does not. 2015-10-17 16:42:54 +00:00
Makefile.inc1 Parallelize build-tools. 2015-10-22 05:01:14 +00:00
ObsoleteFiles.inc Add more obsolete files 2015-10-19 17:31:51 +00:00
README
UPDATING Document isp_*_multi firmware kernel modules removal at r289626. 2015-10-20 19:04:13 +00:00

This is the top level of the FreeBSD source directory.  This file
was last revised on:
$FreeBSD$

For copyright information, please see the file COPYRIGHT in this
directory (additional copyright information also exists for some
sources in this tree - please see the specific source directories for
more information).

The Makefile in this directory supports a number of targets for
building components (or all) of the FreeBSD source tree.  See build(7)
and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html
for more information, including setting make(1) variables.

The `buildkernel` and `installkernel` targets build and install
the kernel and the modules (see below).  Please see the top of
the Makefile in this directory for more information on the
standard build targets and compile-time flags.

Building a kernel is a somewhat more involved process.  See build(7), config(8),
and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html
for more information.

Note: If you want to build and install the kernel with the
`buildkernel` and `installkernel` targets, you might need to build
world before.  More information is available in the handbook.

The kernel configuration files reside in the sys/<arch>/conf
sub-directory.  GENERIC is the default configuration used in release builds.
NOTES contains entries and documentation for all possible
devices, not just those commonly used.


Source Roadmap:
---------------

bin		System/user commands.

cddl		Various commands and libraries under the Common Development
		and Distribution License.

contrib		Packages contributed by 3rd parties.

crypto		Cryptography stuff (see crypto/README).

etc		Template files for /etc.

games		Amusements.

gnu		Various commands and libraries under the GNU Public License.
		Please see gnu/COPYING* for more information.

include		System include files.

kerberos5	Kerberos5 (Heimdal) package.

lib		System libraries.

libexec		System daemons.

release		Release building Makefile & associated tools.

rescue		Build system for statically linked /rescue utilities.

sbin		System commands.

secure		Cryptographic libraries and commands.

share		Shared resources.

sys		Kernel sources.

tests		Regression tests which can be run by Kyua.  See tests/README
		for additional information.

tools		Utilities for regression testing and miscellaneous tasks.

usr.bin		User commands.

usr.sbin	System administration commands.


For information on synchronizing your source tree with one or more of
the FreeBSD Project's development branches, please see:

  http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html