kernel - Tag vm_map_entry structure, slight optimization to zalloc, misc.

* Tag the vm_map_entry structure, allowing debugging programs to
break-down how KMEM is being used more easily.

This re

kernel - Tag vm_map_entry structure, slight optimization to zalloc, misc.

* Tag the vm_map_entry structure, allowing debugging programs to
break-down how KMEM is being used more easily.

This requires an additional argument to vm_map_find() and most
kmem_alloc*() functions.

* Remove the page chunking parameter to zinit() and zinitna(). It was
only being used degeneratively. Increase the chunking from one page
to four pages, which will reduce the amount of vm_map_entry spam in
the kernel_map.

* Use atomic ops when adjusting zone_kern_pages.

show more ...

sys/dev/disk/dm: Remove dm_dev::dev_type

This is unused, and also not necessary.

dm core shouldn't need to be aware of target driver type.
Target dependent actions are handled by target dependent h

sys/dev/disk/dm: Remove dm_dev::dev_type

This is unused, and also not necessary.

dm core shouldn't need to be aware of target driver type.
Target dependent actions are handled by target dependent handlers.
dm targets have oop-like structure, so we don't want/need
dm core to be able to do things like below.

Also see d471f1f9 and 49784e7d.

switch (dev->dev_type) {
case DM_LINEAR_DEV:
do_something_specific_to_linear(); break;
case DM_STRIPE_DEV:
do_something_specific_to_striped(); break;
case ...:
...; break;
}

show more ...

sys/dev/disk/dm: Remove dm/targets/ directory and move its entries to dm/

Device mapper targets' path
sys/dev/disk/dm/targets/<name>/dm_target_<name>.c
are too deep for no reason.

This commit remov

sys/dev/disk/dm: Remove dm/targets/ directory and move its entries to dm/

Device mapper targets' path
sys/dev/disk/dm/targets/<name>/dm_target_<name>.c
are too deep for no reason.

This commit removes targets/ directory which isn't necessary at all,
assuming userspace has no dependencies on this (and it shouldn't either).

Neither NetBSD (sys/dev/dm/dm_target_*.c) nor Linux kernel (drivers/md/dm*.c)
has a directory tree like this, which is better.

show more ...