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Libvirt native C API and daemons
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Michal Privoznik c0d162c68c virNetDevVethCreate: Serialize callers 
Consider dozen of LXC domains, each of them having this type of interface:

    <interface type='network'>
      <mac address='52:54:00:a7:05:4b'/>
      <source network='default'/>
    </interface>

When starting these domain in parallel, all workers may meet in
virNetDevVethCreate() where a race starts. Race over allocating veth
pairs because allocation requires two steps:

  1) find first nonexistent '/sys/class/net/vnet%d/'
  2) run 'ip link add ...' command

Now consider two threads. Both of them find N as the first unused veth
index but only one of them succeeds allocating it. The other one fails.
For such cases, we are running the allocation in a loop with 10 rounds.
However this is very flaky synchronization. It should be rather used
when libvirt is competing with other process than when libvirt threads
fight each other. Therefore, internally we should use mutex to serialize
callers, and do the allocation in loop (just in case we are competing
with a different process). By the way we have something similar already
since 1cf97c87.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
2014-02-26 08:50:47 +01:00
.gnulib@72fb9075b2 maint: update to latest gnulib, for older autoconf 2014-02-21 17:18:34 -07:00
build-aux Make syntax check notice assignments w/o surrounding spaces. 2014-01-20 14:35:26 +01:00
daemon virNetServerRun: Notify systemd that we're accepting clients 2014-02-24 10:54:48 +01:00
docs Document the keyboard as a valid input type 2014-02-24 18:55:00 +01:00
examples AppArmor: Fix the place where the template should be installed 2014-02-12 06:34:32 -07:00
gnulib maint: update to latest gnulib 2014-01-01 06:02:47 -07:00
include bhyve: add a basic driver 2014-02-19 14:21:50 +00:00
m4 virNetServerRun: Notify systemd that we're accepting clients 2014-02-24 10:54:48 +01:00
po Add virStringSearch method for regex matching 2014-02-24 10:46:28 +00:00
src virNetDevVethCreate: Serialize callers 2014-02-26 08:50:47 +01:00
tests build: avoid ld_preload tests on mingw 2014-02-25 18:51:11 -07:00
tools virsh: mark CPU usage field names as translatable 2014-02-25 08:32:11 +01:00
.ctags maint: Make ctags work out of the box 2013-07-18 08:47:21 +02:00
.dir-locals.el build: avoid tabs that failed syntax-check 2012-09-06 09:43:46 -06:00
.gitignore Rename virDomainGetRootFilesystem to virDomainGetFilesystemForTarget 2014-02-20 15:50:46 +00:00
.gitmodules make .gnulib a submodule 2009-07-08 16:17:51 +02:00
.mailmap Autogenerate AUTHORS 2012-10-19 12:44:56 -04:00
AUTHORS.in Add Roman Bogorodskiy to the committers list 2014-02-20 20:51:08 +04:00
autobuild.sh Remove python binding 2013-11-25 16:08:00 +00:00
autogen.sh autogen.sh: Correctly detect .git as a file 2013-08-29 13:19:45 +02:00
bootstrap maint: update to latest gnulib 2014-01-01 06:02:47 -07:00
bootstrap.conf Add helpers for getting env vars in a setuid environment 2013-10-21 14:03:52 +01:00
cfg.mk Introduce new OOM testing support 2014-02-20 15:36:10 +00:00
ChangeLog-old maint: typo fixes 2013-10-22 16:49:32 +01:00
config-post.h build: fix build of virt-login-shell on systems with older gnutls 2013-10-22 09:41:50 -06:00
configure.ac virNetServerRun: Notify systemd that we're accepting clients 2014-02-24 10:54:48 +01:00
COPYING maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
COPYING.LESSER maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
HACKING maint: enforce comma style usage 2013-11-20 09:24:18 -07:00
libvirt.pc.in Add missing 'libvirt_lxc_api' variable in pkg-config file 2013-09-04 14:52:40 +01:00
libvirt.spec.in spec: add missing dep of libvirt-daemon-config-nwfilter 2014-02-13 06:39:51 -07:00
Makefile.am Introduce Libvirt Wireshark dissector 2014-01-20 17:09:41 +01:00
Makefile.nonreentrant maint: use LGPL correctly 2013-05-20 14:03:48 -06:00
mingw-libvirt.spec.in Remove python binding 2013-11-25 16:08:00 +00:00
README Correct typos in the documentation (Atsushi SAKAI) 2008-01-24 10:15:13 +00:00
README-hacking maint: relax git minimum version 2010-02-24 14:29:27 -05:00
run.in Remove python binding 2013-11-25 16:08:00 +00:00
TODO Update todo list file to point at bugzilla/website 2010-10-13 16:45:26 +01:00

README 

         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>