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0164e05781
freebsd-dev/sys
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Alan Cox 0164e05781 Replace the linear search in vm_map_findspace() with an O(log n) 
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
2004-08-13 08:06:34 +00:00
..
alpha Add __elfN(dump_thread). This function is called from __elfN(coredump) 2004-08-11 02:35:06 +00:00
amd64 Mark end of frames. 2004-08-11 23:23:05 +00:00
arm Add __elfN(dump_thread). This function is called from __elfN(coredump) 2004-08-11 02:35:06 +00:00
boot Catch up with change to <machine/pte.h>. 2004-08-10 02:08:57 +00:00
cam add support Frontier Labs NEX IA+ Digital Audio Player with USB CF card reader/writer 2004-08-12 23:17:09 +00:00
coda Put a version element in the VFS filesystem configuration structure 2004-07-30 22:08:52 +00:00
compat Add __elfN(dump_thread). This function is called from __elfN(coredump) 2004-08-11 02:35:06 +00:00
conf - Introduce an ofw_bus kobj-interface for retrieving the OFW node and a 2004-08-12 17:41:33 +00:00
contrib Loopback fix from Mathieu Sauve-Frankel: 2004-08-12 14:15:42 +00:00
crypto
ddb Damage control. Correcly advance symtab and strtab pointers, not 2004-07-28 08:59:08 +00:00
dev MPSAFE locking 2004-08-13 06:22:35 +00:00
doc
fs use bufdone() not biodone(). 2004-08-08 13:23:05 +00:00
gdb Comment-out the debugging printf I left in in case there were some 2004-08-10 19:32:33 +00:00
geom MFp4: Simplify code a bit: 2004-08-11 23:41:53 +00:00
gnu Put a version element in the VFS filesystem configuration structure 2004-07-30 22:08:52 +00:00
i4b Fix a possible hang which apparently occurs during a warm boot (cold boot 2004-07-18 20:13:31 +00:00
i386 MPSAFE locking 2004-08-13 06:22:35 +00:00
ia64 In set_regs(), flush the dirty registers onto the backingstore before 2004-08-11 05:29:13 +00:00
isa Assume a finger of regular width when no width value is reported by 2004-08-08 01:26:00 +00:00
isofs/cd9660 Put a version element in the VFS filesystem configuration structure 2004-07-30 22:08:52 +00:00
kern looks like rwatson forgot tabs... :) 2004-08-13 07:38:58 +00:00
libkern
modules - Introduce an ofw_bus kobj-interface for retrieving the OFW node and a 2004-08-12 17:41:33 +00:00
net Added two new media types for 10GBASE-SR and 10GBASE-LR 2004-08-12 23:48:26 +00:00
net80211
netatalk Inline umich license from COPYRIGHT to make it clear what license the 2004-08-10 03:23:05 +00:00
netatm Avoid casts as lvalues. 2004-07-28 06:59:55 +00:00
netgraph This is the netgraph node framework for the user side call control 2004-08-12 14:22:00 +00:00
netinet Add the ability to associate ipfw rules with a specific prison ID. 2004-08-12 22:06:55 +00:00
netinet6 When allocating the IPv6 header to stick in front of raw packet being 2004-08-12 18:31:36 +00:00
netipsec
netipx Avoid casts as lvalues. Declare local variable as u_char * instead of 2004-07-28 06:58:23 +00:00
netkey
netnatm Constify send and receive space constants in natm. 2004-06-24 03:11:29 +00:00
netncp
netsmb Avoid casts as lvalues. 2004-07-28 06:59:55 +00:00
nfs Remove advertising clause from University of California Regent's 2004-04-07 05:00:01 +00:00
nfs4client Put a version element in the VFS filesystem configuration structure 2004-07-30 22:08:52 +00:00
nfsclient Put a version element in the VFS filesystem configuration structure 2004-07-30 22:08:52 +00:00
nfsserver If debug.mpsafenet is non-zero, run the NFS server callout without 2004-07-24 02:32:27 +00:00
opencrypto Don't acquire Giant in cryptof_close(), as the code is intended to be 2004-08-10 03:26:17 +00:00
pc98 MFi386: revision 1.597. 2004-08-05 13:01:29 +00:00
pccard Move PNP IDs back into oldcard files 2004-08-13 06:57:31 +00:00
pci Revert rev 1.93 and replace it by grabbing the vr lock before calling 2004-08-11 04:30:49 +00:00
posix4 The sem_timedwait() and ksem_timedwait() functions both 2004-02-03 22:27:03 +00:00
powerpc - Introduce an ofw_bus kobj-interface for retrieving the OFW node and a 2004-08-12 17:41:33 +00:00
rpc
security * Add a "how" argument to uma_zone constructors and initialization functions 2004-08-02 00:18:36 +00:00
sparc64 - Introduce an ofw_bus kobj-interface for retrieving the OFW node and a 2004-08-12 17:41:33 +00:00
sys Add a macro to define the size of a subsection of a structure. 2004-08-13 00:53:40 +00:00
tools
ufs use bufdone() not biodone(). 2004-08-08 13:23:05 +00:00
vm Replace the linear search in vm_map_findspace() with an O(log n) 2004-08-13 08:06:34 +00:00
Makefile