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royger 50d6b5faf4 xen-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:	r290610

dev/xen/blkfront/blkfront.c:
 - Add and announce support for unmapped IO.
2015-11-09 12:22:44 +00:00
bin Protecting against rm -rf / is now POSIXLY_CORRECT per posix 1003.1 2015-11-07 02:18:19 +00:00
cddl Reduce the Makefile snippet complexity a bit 2015-11-09 02:29:38 +00:00
contrib Merge from head r290483 2015-11-07 11:02:33 +00:00
crypto Merge OpenSSL 1.0.2d. 2015-10-30 20:51:33 +00:00
etc Add some basic tests that exercise cputime limits with limits(1) 2015-11-09 01:05:31 +00:00
gnu Include "system.h" for isdir() prototype. 2015-11-04 05:38:08 +00:00
include Merge from head r290483 2015-11-07 11:02:33 +00:00
kerberos5 Partially revert r288266: Remove SUBDIR_PARALLEL from kerberos5/lib. 2015-10-13 18:52:56 +00:00
lib Bump .Dd 2015-11-09 10:41:27 +00:00
libexec Rather than using the #define for path names, indirect through a char * 2015-10-31 04:39:55 +00:00
release Remove noatime from tmpfs(5) fstab(5) entry. 2015-11-09 06:30:26 +00:00
rescue Make iscsictl and iscsid build if MK_ISCSI == yes 2015-10-17 21:11:42 +00:00
sbin Userspace part of reroot support. This makes it possible to change 2015-11-08 17:33:48 +00:00
secure Fix a typo. I did not mean it, really. 2015-11-06 18:24:49 +00:00
share Add a manual page for PHOLD() and friends. 2015-11-08 01:41:44 +00:00
sys xen-blkfront: add support for unmapped IO 2015-11-09 12:22:44 +00:00
targets Connect mpsutil for META MODE. 2015-10-28 16:22:00 +00:00
tests Add tests for the copyin(9) handling of illegal buffers. 2015-10-19 20:22:17 +00:00
tools Integrate tools/regression/lib/libc/gen into the FreeBSD test suite 2015-11-09 06:24:11 +00:00
usr.bin Add some basic tests that exercise cputime limits with limits(1) 2015-11-09 01:05:31 +00:00
usr.sbin Bump .Dd 2015-11-09 09:39:59 +00:00
.arcconfig Add repository.callsign, to help arcanist figure out what repo it's 2015-07-02 22:23:52 +00:00
.arclint phabricator related changes: 2015-04-20 20:33:22 +00:00
COPYRIGHT Bump copyright year. 2014-12-31 10:00:43 +00:00
LOCKS
MAINTAINERS Add maintainer entries for llvm, lldb, compiler-rt, libc++ and libcxxrt. 2015-11-06 22:24:41 +00:00
Makefile Add built-in ccache build support via WITH_CCACHE_BUILD option. 2015-11-08 00:50:18 +00:00
Makefile.inc1 Add built-in ccache build support via WITH_CCACHE_BUILD option. 2015-11-08 00:50:18 +00:00
ObsoleteFiles.inc Merge from head r290483 2015-11-07 11:02:33 +00:00
README README: changes and fixups 2015-04-19 07:16:44 +00:00
UPDATING Add a note about the inpact on databases of the changes in collation support 2015-11-07 17:54:51 +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