algorithm built into the map entry splay tree. This replaces the
first_free hint in struct vm_map with two fields in vm_map_entry:
adj_free, the amount of free space following a map entry, and
max_free, the maximum amount of free space in the entry's subtree.
These fields make it possible to find a first-fit free region of a
given size in one pass down the tree, so O(log n) amortized using
splay trees.
This significantly reduces the overhead in vm_map_findspace() for
applications that mmap() many hundreds or thousands of regions, and
has a negligible slowdown (0.1%) on buildworld. See, for example, the
discussion of a micro-benchmark titled "Some mmap observations
compared to Linux 2.6/OpenBSD" on -hackers in late October 2003.
OpenBSD adopted this approach in March 2002, and NetBSD added it in
November 2003, both with Red-Black trees.
Submitted by: Mark W. Krentel
* Serialize access to the sysctl routines and the notify handler
* Assert that the sx lock is held in any functions they call.
* Note that recursively calling to re-enable the hotkeys is sub-optimal.
* Remove the interrupt wrapper that locked Giant and call the handler
directly. Mark the handler as MPSAFE.
* Don't attempt to detect if a handler is installed. Leave that to the
bus_alloc_resource() function.
* Serialize operations in acpi_video_bind_outputs(), acpi_video_detach(),
acpi_video_notify_handler(), acpi_video_power_profile(), and the sysctls.
The main goal is to protect the shared device list and prevent conflicting
settings.
* Add assertions that the sx lock is held in the leaf functions.
* Restructure the event handling path. acpi_tz_thread() now calls
acpi_tz_timeout() any time an event occurs. acpi_tz_timeout() checks
the flags and calls acpi_tz_power_profile(), acpi_tz_establish(), and
acpi_tz_monitor() as appropriate. Notifies only do a wakeup and let
acpi_tz_thread() do the actual work. This path is cleaner and allows
locking since the call path is now always a D.A.G.
* Add the acpi_tz_signal() function to set flags and wake the thread.
* Remove the tz_tmp_updating flag since calls are serialized by
acpi_tz_thread().
* Remove Giant locking.
* Serialize acpi_pwr_switch_consumer() and acpi_pwr_wake_enable().
* Make acpi_pwr_switch_consumer() have a single exit point.
* Add assertions to the leaf functions they call.
* Fix a memory leak in acpi_pwr_deregister_consumer(). However, it is
currently ifdefed out so this code was unused.
* Serialize access to acpi_pci_link_config(), acpi_pci_find_prt(),
acpi_pci_link_route(), and acpi_pci_link_resume().
* Add lock assertions to all functions called by them.
* Serialize notifying the user in acpi_lid_notify_status_changed(). This
way multiple lid events occur in order.
* Add an initialization pass to get the lid status at boot-time. This
pass does not notify any apps but gets the initial status.
* Use the common serialization macros instead of rolling our own.
* Increase the coverage of the lock in EcSpaceHandler() to cover the entire
loop to avoid dropping the lock when reading more than one byte.
* Serialize ops in acpi_cmbat_notify_handler(), acpi_cmbat_ioctl(),
acpi_cmbat_init_battery(), and acpi_cmbat_get_battinfo().
* Get the softc directly in acpi_cmbat_get_total_battinfo() rather than
build an array of them.
* Don't queue a _BIF query after receiving a notify. Since we clear the
timespec, a _BIF query will be done in the context of the next caller.
* Add asserts to leaf functions that operate on shared data.
* Remove the bst/bif updating flags now that we hold the lock over the
full query.
* Explain various comments in more detail.
* Serialize acpi_battery_get_battdesc(), acpi_battery_register(), and
acpi_battery_remove().
* Assert that the sx lock is held in acpi_batteries_init().
* Remove check for device_get_softc() returning NULL.
* Serialize notification of acline changes in acpi_acad_get_status().
* Remove the initializing flag. With the locking, we don't need to
push off requests for the acline before initialization is done.
* Don't check device_get_softc(), it can't return NULL.
* Serialize calls to acpi_alloc_resource(), acpi_release_resource(),
acpi_Enable(), acpi_Disable(), and acpi_debug_sysctl().
* Acquire the ACPI mutex in acpi_register_ioctl(), acpi_deregister_ioctl(),
and acpiioctl().
* Acquire the mutex while disabling subsequent requests to enter a
sleep state in acpi_SetSleepState().
* Be sure to re-enable sleep requests and don't run resume methods when
the current request fails.
* Don't check if sleep requests are disabled in the ACPIIO_SETSLPSTATE
ioctl. acpi_SetSleepState() does this for us.
* Remove the acquisition of Giant from the struct cdevsw.
* Remove the ACPI_USE_THREADS option.
* Add and comment our locking primitives. The mutex primitives use a
a static mutex and the serialization ones use a static sx lock. A global
acpi_mutex is used for access to global resources (i.e., writes to the
SMI_CMD register.)
* Remove 4.x compat defines.
input files:
1999-06-25 Paul Eggert <eggert@twinsun.com>
* inflate.c (huft_build):
Set n to length of v, to detect improper tables.
Don't accidentally grow j past z.
MFC after: 3 days
changes, although one release note, about udav(4) promiscuous mode,
was deleted as it was redundant (the driver itself is new and this
fact has its own note).
