This is an introduction of library operating system (LibOS) for Linux.
Our objective is to build the kernel network stack as a shared library
that can be linked to by userspace programs to provide network stack
personalization and testing facilities, and allow researchers to more
easily simulate complex network topologies of linux routers/hosts.
Although the architecture itself can virtualize various things, the
current design only focuses on the network stack. You can benefit
network stack feature such as TCP, UDP, SCTP, DCCP (IPv4 and IPv6),
Mobie IPv6, Multipath TCP (IPv4/IPv6, out-of-tree at the present
moment), and netlink with various userspace applications (quagga,
iproute2, iperf, wget, and thttpd).
== What is LibOS ? ==
The library exposes an entry point as API, which is lib_init(), in
order to connect userspace applications to the (userspace-version)
kernel network stack. The clock source, virtual struct net_device, and
scheduler are provided by caller while kernel resource like system
calls is provided by callee.
Once the LibOS is initialized via the API, userspace applications with
POSIX socket can use the system calls defined in LibOS by replacing
from the original socket-related symbols to the LibOS-specific
one. Then application can benefit the network stack of LibOS without
involving the host network stack.
Currently, there are two users of LibOS: Network Stack in Userspace
(NUSE) and ns-3 network simulatior with Direct Code Execution
(DCE). These codes are managed at an external repository(*1).
== How to use it ? ==
to build the library,
% make {defconfig,menuconfig} ARCH=lib
then, build it.
% make library ARCH=lib
You will see liblinux-$(KERNELVERSION).so in the top directory.
== More information ==
The crucial difference between UML (user-mode linux) and this approach
is that we allow multiple network stack instances to co-exist within a
single process with dlmopen(3) like linking for easy debugging.
These patches are also available on this branch:
git://github.com/libos-nuse/net-next-nuse.git for-asm-upstream
For further information, here is a slideset presented at the last
netdev0.1 conference.
http://www.slideshare.net/hajimetazaki/library-operating-system-for-linux-netdev01
I would appreciate any kind of your feedback regarding to upstream
this feature.
*1 https://github.com/libos-nuse/linux-libos-tools
Hajime Tazaki (11):
sysctl: make some functions unstatic to access by arch/lib
slab: add private memory allocator header for arch/lib
lib: public headers and API implementations for userspace programs
lib: memory management (kernel glue code)
lib: time handling (kernel glue code)
lib: context and scheduling handling (kernel glue code)
lib: sysctl handling (kernel glue code)
lib: other kernel glue layer code
lib: asm-generic files
lib: libos build scripts and documentation
lib: tools used for test scripts
Documentation/virtual/libos-howto.txt | 143 ++++++++
MAINTAINERS | 9 +
arch/lib/.gitignore | 8 +
arch/lib/Kconfig | 121 +++++++
arch/lib/Makefile | 248 +++++++++++++
arch/lib/Makefile.print | 44 +++
arch/lib/cred.c | 16 +
arch/lib/dcache.c | 93 +++++
arch/lib/defconfig | 653 ++++++++++++++++++++++++++++++++++
arch/lib/filemap.c | 27 ++
arch/lib/fs.c | 287 +++++++++++++++
arch/lib/generate-linker-script.py | 50 +++
arch/lib/glue.c | 336 +++++++++++++++++
arch/lib/hrtimer.c | 122 +++++++
arch/lib/include/asm/Kbuild | 55 +++
arch/lib/include/asm/atomic.h | 47 +++
arch/lib/include/asm/barrier.h | 8 +
arch/lib/include/asm/bitsperlong.h | 12 +
arch/lib/include/asm/current.h | 7 +
arch/lib/include/asm/elf.h | 10 +
arch/lib/include/asm/hardirq.h | 8 +
arch/lib/include/asm/page.h | 14 +
arch/lib/include/asm/pgtable.h | 30 ++
arch/lib/include/asm/processor.h | 19 +
arch/lib/include/asm/ptrace.h | 4 +
arch/lib/include/asm/segment.h | 6 +
arch/lib/include/asm/sembuf.h | 4 +
arch/lib/include/asm/shmbuf.h | 4 +
arch/lib/include/asm/shmparam.h | 4 +
arch/lib/include/asm/sigcontext.h | 6 +
arch/lib/include/asm/slab.h | 21 ++
arch/lib/include/asm/stat.h | 4 +
arch/lib/include/asm/statfs.h | 4 +
arch/lib/include/asm/swab.h | 7 +
arch/lib/include/asm/thread_info.h | 35 ++
arch/lib/include/asm/uaccess.h | 14 +
arch/lib/include/asm/unistd.h | 4 +
arch/lib/include/sim-assert.h | 23 ++
arch/lib/include/sim-init.h | 134 +++++++
arch/lib/include/sim-printf.h | 13 +
arch/lib/include/sim-types.h | 53 +++
arch/lib/include/sim.h | 51 +++
arch/lib/include/uapi/asm/byteorder.h | 6 +
arch/lib/inode.c | 146 ++++++++
arch/lib/lib-device.c | 187 ++++++++++
arch/lib/lib-socket.c | 410 +++++++++++++++++++++
arch/lib/lib.c | 289 +++++++++++++++
arch/lib/lib.h | 21 ++
arch/lib/modules.c | 36 ++
arch/lib/pid.c | 29 ++
arch/lib/print.c | 56 +++
arch/lib/proc.c | 164 +++++++++
arch/lib/processor.mk | 7 +
arch/lib/random.c | 53 +++
arch/lib/sched.c | 365 +++++++++++++++++++
arch/lib/security.c | 45 +++
arch/lib/seq.c | 122 +++++++
arch/lib/slab.c | 200 +++++++++++
arch/lib/softirq.c | 104 ++++++
arch/lib/splice.c | 20 ++
arch/lib/super.c | 210 +++++++++++
arch/lib/sysctl.c | 284 +++++++++++++++
arch/lib/sysfs.c | 83 +++++
arch/lib/tasklet-hrtimer.c | 57 +++
arch/lib/tasklet.c | 76 ++++
arch/lib/time.c | 149 ++++++++
arch/lib/timer.c | 230 ++++++++++++
arch/lib/vmscan.c | 26 ++
arch/lib/workqueue.c | 242 +++++++++++++
fs/proc/proc_sysctl.c | 16 +-
include/linux/slab.h | 12 +
tools/testing/libos/.gitignore | 6 +
tools/testing/libos/Makefile | 38 ++
tools/testing/libos/README | 15 +
tools/testing/libos/bisect.sh | 10 +
tools/testing/libos/dce-test.sh | 23 ++
tools/testing/libos/nuse-test.sh | 57 +++
77 files changed, 6544 insertions(+), 8 deletions(-)
create mode 100644 Documentation/virtual/libos-howto.txt
create mode 100644 arch/lib/.gitignore
create mode 100644 arch/lib/Kconfig
create mode 100644 arch/lib/Makefile
create mode 100644 arch/lib/Makefile.print
create mode 100644 arch/lib/cred.c
create mode 100644 arch/lib/dcache.c
create mode 100644 arch/lib/defconfig
create mode 100644 arch/lib/filemap.c
create mode 100644 arch/lib/fs.c
create mode 100755 arch/lib/generate-linker-script.py
create mode 100644 arch/lib/glue.c
create mode 100644 arch/lib/hrtimer.c
create mode 100644 arch/lib/include/asm/Kbuild
create mode 100644 arch/lib/include/asm/atomic.h
create mode 100644 arch/lib/include/asm/barrier.h
create mode 100644 arch/lib/include/asm/bitsperlong.h
create mode 100644 arch/lib/include/asm/current.h
create mode 100644 arch/lib/include/asm/elf.h
create mode 100644 arch/lib/include/asm/hardirq.h
create mode 100644 arch/lib/include/asm/page.h
create mode 100644 arch/lib/include/asm/pgtable.h
create mode 100644 arch/lib/include/asm/processor.h
create mode 100644 arch/lib/include/asm/ptrace.h
create mode 100644 arch/lib/include/asm/segment.h
create mode 100644 arch/lib/include/asm/sembuf.h
create mode 100644 arch/lib/include/asm/shmbuf.h
create mode 100644 arch/lib/include/asm/shmparam.h
create mode 100644 arch/lib/include/asm/sigcontext.h
create mode 100644 arch/lib/include/asm/slab.h
create mode 100644 arch/lib/include/asm/stat.h
create mode 100644 arch/lib/include/asm/statfs.h
create mode 100644 arch/lib/include/asm/swab.h
create mode 100644 arch/lib/include/asm/thread_info.h
create mode 100644 arch/lib/include/asm/uaccess.h
create mode 100644 arch/lib/include/asm/unistd.h
create mode 100644 arch/lib/include/sim-assert.h
create mode 100644 arch/lib/include/sim-init.h
create mode 100644 arch/lib/include/sim-printf.h
create mode 100644 arch/lib/include/sim-types.h
create mode 100644 arch/lib/include/sim.h
create mode 100644 arch/lib/include/uapi/asm/byteorder.h
create mode 100644 arch/lib/inode.c
create mode 100644 arch/lib/lib-device.c
create mode 100644 arch/lib/lib-socket.c
create mode 100644 arch/lib/lib.c
create mode 100644 arch/lib/lib.h
create mode 100644 arch/lib/modules.c
create mode 100644 arch/lib/pid.c
create mode 100644 arch/lib/print.c
create mode 100644 arch/lib/proc.c
create mode 100644 arch/lib/processor.mk
create mode 100644 arch/lib/random.c
create mode 100644 arch/lib/sched.c
create mode 100644 arch/lib/security.c
create mode 100644 arch/lib/seq.c
create mode 100644 arch/lib/slab.c
create mode 100644 arch/lib/softirq.c
create mode 100644 arch/lib/splice.c
create mode 100644 arch/lib/super.c
create mode 100644 arch/lib/sysctl.c
create mode 100644 arch/lib/sysfs.c
create mode 100644 arch/lib/tasklet-hrtimer.c
create mode 100644 arch/lib/tasklet.c
create mode 100644 arch/lib/time.c
create mode 100644 arch/lib/timer.c
create mode 100644 arch/lib/vmscan.c
create mode 100644 arch/lib/workqueue.c
create mode 100644 tools/testing/libos/.gitignore
create mode 100644 tools/testing/libos/Makefile
create mode 100644 tools/testing/libos/README
create mode 100755 tools/testing/libos/bisect.sh
create mode 100755 tools/testing/libos/dce-test.sh
create mode 100755 tools/testing/libos/nuse-test.sh
--
2.1.0
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