src/sys/vm/default_pager.c, branch releng/6.2

/* -> /*- for license, minor formatting changes

2005-01-07T02:29:27+00:00

Access the swap_pagers' ->putpages() through swappagerops instead

2003-08-06T12:05:48+00:00

of directly, this is a cleaner way to do it.

Use sparse struct initializations for struct pagerops.

2003-08-05T06:51:26+00:00

This makes grepping for which pagers implement which methods easier.

Use __FBSDID().

2003-06-11T23:50:51+00:00

Remove references to vm_zone.h and switch over to the new uma API.

2002-03-20T04:02:59+00:00

Remove __P.

2002-03-19T22:20:14+00:00

- Remove a number of extra newlines that do not belong here according to

2002-03-10T21:52:48+00:00

  style(9)
- Minor space adjustment in cases where we have "( ", " )", if(), return(),
  while(), for(), etc.
- Add /* SYMBOL */ after a few #endifs.

Reviewed by:	alc

With Alfred's permission, remove vm_mtx in favor of a fine-grained approach

2001-07-04T16:20:28+00:00

(this commit is just the first stage).  Also add various GIANT_ macros to
formalize the removal of Giant, making it easy to test in a more piecemeal
fashion. These macros will allow us to test fine-grained locks to a degree
before removing Giant, and also after, and to remove Giant in a piecemeal
fashion via sysctl's on those subsystems which the authors believe can
operate without Giant.

Introduce a global lock for the vm subsystem (vm_mtx).

2001-05-19T01:28:09+00:00

vm_mtx does not recurse and is required for most low level
vm operations.

faults can not be taken without holding Giant.

Memory subsystems can now call the base page allocators safely.

Almost all atomic ops were removed as they are covered under the
vm mutex.

Alpha and ia64 now need to catch up to i386's trap handlers.

FFS and NFS have been tested, other filesystems will need minor
changes (grabbing the vm lock when twiddling page properties).

Reviewed (partially) by: jake, jhb

- If swap metadata does not fit into the KVM, reduce the number of

2000-12-13T10:01:00+00:00

struct swblock entries by dividing the number of the entries by 2
until the swap metadata fits.

- Reject swapon(2) upon failure of swap_zone allocation.

This is just a temporary fix. Better solutions include:
(suggested by:	dillon)

o reserving swap in SWAP_META_PAGES chunks, and
o swapping the swblock structures themselves.

Reviewed by:	alfred, dillon