allocate memory from kernel_map but some of the objects are freed from
interrupt context, we put objects on a queue instead of freeing them
immediately. then in softdep_process_worklist() (which is called at
least once per second from the syncer), we process that queue and
free all the objects. allocating from kernel_map instead of from kmem_map
allows us to have a much larger number of softdeps pending even in
configurations where kmem_map is relatively small.
adjusted via sysctl. file systems that have hash tables which are
sized based on the value of this variable now resize those hash tables
using the new value. the max number of FFS softdeps is also recalculated.
convert various file systems to use the <sys/queue.h> macros for
their hash tables.
device (rather, the device that carries that attribute) also
carry one or more attributes indicating which type of controller
it might be.
This will allow systems that might have AGP, but would never have
e.g. an Intel PCI-Host bridge, to trim out code that won't be used.
This prevents attaching multiple [E]ISA buses, which we don't support
(Is there any such thing to support? I'm skeptical) and avoids the
"panic: isaattach: ISA bus already seen" that occurs on some laptops
with docking stations and EISA boxes. Since there is only one [E]ISA bus,
logically, the ISA device probe will still find devices on the
docking station.
This does not address the problem of inserting or removing the docking station
at runtime.
Relevant PRs: kern/6544, port-i386/10392, kern/11627, kern/13557,
install/13865.
wiz