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Tag: anttii kantee
EuroBSDCon 2008 - Anttii Kantee - Converting kernel file systems to services
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, anttii kantee
MP3 (1 byte, 55 minutes), OGG (1 byte, 55 minutes), PDF (1 byte, n pages)
ABSD/UNIX operating system is traditionally split
into two pieces: the kernel and userspace. Historically
the reasons for this were clear: the UNIX kernel
was a simple entity. However, over time the kernel
has grown more and more complex. Currently, most
of the same functionality is available both in
userspace and the kernel, but under different names.
Examples include synchronization routines and
threading support. For instance, to lock a mutex
in the NetBSD kernel, the call is mutex_enter(),
while in userspace the routine which does exactly
the same thing is known as pthread_mutex_enter().
Taking another classic example, a BSD style OS has
malloc()/free() available both in userspace and the
kernel, but with different linkage (the kernel
malloc interface is currently being widely deprecated,
though). This imposes a completely arbitrary division
between the kernel and userspace. Most functionality
provided by an opearating system should be treated
as a service instead of explicitly pinning it down
as a userspace daemon or a kernel driver. Currently,
due to the arbitrarily difference in programming
interface names, functionality must be explicitly
ported between the kernel and userspace if it is
to run in one or the other environment. By unifying
the environments where possible, the arbitrary
division is weakened and porting between these
environments becomes simpler.
Antti Kantee has been a NetBSD developer for many
many moons. He has managed to work on quite a few
bits and pieces of a BSD system: userland utilities,
the pkgsrc packaging system, networking, virtual
memory, device drivers, hardware support and file
systems.
See also http://www.netbsd.org/docs/puffs/rump.htm
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