freebsd with flexible iflib nic queues
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Konstantin Belousov a677b31425 The vm_pageout_flush() functions sbusies pages in the passed pages
run.  After that, the pager put method is called, usually translated
to VOP_WRITE().  For the filesystems which use buffer cache,
bufwrite() sbusies the buffer pages again, waiting for the xbusy state
to drain.  The later is done in vfs_drain_busy_pages(), which is
called with the buffer pages already sbusied (by vm_pageout_flush()).

Since vfs_drain_busy_pages() can only wait for one page at the time,
and during the wait, the object lock is dropped, previous pages in the
buffer must be protected from other threads busying them.  Up to the
moment, it was done by xbusying the pages, that is incompatible with
the sbusy state in the new implementation of busy.  Switch to sbusy.

Reported and tested by:	pho
Sponsored by:	The FreeBSD Foundation
2013-09-05 12:56:08 +00:00
bin sh: Make return return from the closest function or dot script. 2013-09-04 22:10:16 +00:00
cddl Build all ZFS testing & debugging tools with -g. 2013-08-27 04:01:31 +00:00
contrib Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
crypto Apply upstream revision 1.151 (fix relative symlinks) 2013-08-13 09:06:18 +00:00
etc authpf needs /var/authpf to exist and be writable by group authpf. 2013-09-05 12:35:23 +00:00
games Remove a reference to instant-server which has been removed from the 2013-03-21 12:42:25 +00:00
gnu Remove our hacked GNU patch. 2013-09-03 20:03:10 +00:00
include Implement fdclosedir(3) function, which is equivalent to the closedir(3) 2013-08-18 20:11:34 +00:00
kerberos5 Fix the getpwnam_r() call in the pname_to_uid() kerberos library function so 2013-05-02 12:52:49 +00:00
lib Correct two comments. 2013-09-05 12:21:11 +00:00
libexec Revert r253748,253749 2013-07-28 18:44:17 +00:00
release Fix 'make release' on older hosts: use buildworld legacy utilities. 2013-08-27 04:42:42 +00:00
rescue - Trim an unused and bogus Makefile for mount_smbfs. 2013-06-28 21:00:08 +00:00
sbin Change the cap_rights_t type from uint64_t to a structure that we can extend 2013-09-05 00:09:56 +00:00
secure Remove references to MK_IDEA. 2013-04-27 05:44:39 +00:00
share Add more references. 2013-09-05 07:13:08 +00:00
sys The vm_pageout_flush() functions sbusies pages in the passed pages 2013-09-05 12:56:08 +00:00
tools sh: Make return return from the closest function or dot script. 2013-09-04 22:10:16 +00:00
usr.bin Fix file selection logic for the RCS/SCCS case, as was done for the simple 2013-09-05 05:51:15 +00:00
usr.sbin Remove fallback to fork(2) if pdfork(2) is not available. If the parent 2013-09-05 01:05:48 +00:00
COPYRIGHT Happy New Year 2013! 2012-12-31 11:22:55 +00:00
LOCKS Test commit to make sure commit mail works after moving the server. 2012-12-29 16:03:23 +00:00
MAINTAINERS Add myself as maintainer for nvme(4), nvd(4) and nvmecontrol(8). 2013-07-31 18:18:02 +00:00
Makefile Don't let user specified DESTDIR, break building our chosen make. 2013-08-17 04:41:35 +00:00
Makefile.inc1 - Fix LOCAL_MTREE so it properly handles multiple files and quotes 2013-08-30 01:32:47 +00:00
ObsoleteFiles.inc Remove our hacked GNU patch. 2013-09-03 20:03:10 +00:00
README
UPDATING Remove fallback to fork(2) if pdfork(2) is not available. If the parent 2013-09-05 01:05:48 +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, the most
commonly used one being ``world'', which rebuilds and installs
everything in the FreeBSD system from the source tree except the
kernel, the kernel-modules and the contents of /etc.  The ``world''
target should only be used in cases where the source tree has not
changed from the currently running version.  See:
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, documentation
for which can be found at:
   http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html
And in the config(8) man page.
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 sample kernel configuration files reside in the sys/<arch>/conf
sub-directory (assuming that you've installed the kernel sources), the
file named GENERIC being the one used to build your initial installation
kernel.  The file NOTES contains entries and documentation for all possible
devices, not just those commonly used.  It is the successor of the ancient
LINT file, but in contrast to LINT, it is not buildable as a kernel but a
pure reference and documentation file.


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.

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