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Paolo Bonzini e7c033c3fa add hierarchical bitmap data type and test cases 
HBitmaps provides an array of bits.  The bits are stored as usual in an
array of unsigned longs, but HBitmap is also optimized to provide fast
iteration over set bits; going from one bit to the next is O(logB n)
worst case, with B = sizeof(long) * CHAR_BIT: the result is low enough
that the number of levels is in fact fixed.

In order to do this, it stacks multiple bitmaps with progressively coarser
granularity; in all levels except the last, bit N is set iff the N-th
unsigned long is nonzero in the immediately next level.  When iteration
completes on the last level it can examine the 2nd-last level to quickly
skip entire words, and even do so recursively to skip blocks of 64 words or
powers thereof (32 on 32-bit machines).

Given an index in the bitmap, it can be split in group of bits like
this (for the 64-bit case):

     bits 0-57 => word in the last bitmap     | bits 58-63 => bit in the word
     bits 0-51 => word in the 2nd-last bitmap | bits 52-57 => bit in the word
     bits 0-45 => word in the 3rd-last bitmap | bits 46-51 => bit in the word

So it is easy to move up simply by shifting the index right by
log2(BITS_PER_LONG) bits.  To move down, you shift the index left
similarly, and add the word index within the group.  Iteration uses
ffs (find first set bit) to find the next word to examine; this
operation can be done in constant time in most current architectures.

Setting or clearing a range of m bits on all levels, the work to perform
is O(m + m/W + m/W^2 + ...), which is O(m) like on a regular bitmap.

When iterating on a bitmap, each bit (on any level) is only visited
once.  Hence, The total cost of visiting a bitmap with m bits in it is
the number of bits that are set in all bitmaps.  Unless the bitmap is
extremely sparse, this is also O(m + m/W + m/W^2 + ...), so the amortized
cost of advancing from one bit to the next is usually constant.

Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
 		2013-01-25 18:18:32 +01:00
QMP qmp: add pull_event function 2012-10-24 10:26:22 +02:00
audio audio: Replace non-portable asprintf in debug code by g_strdup_printf 2013-01-16 12:03:26 -06:00
backends Make all static TypeInfos const 2013-01-10 15:11:53 -06:00
block iscsi: add support for iovectors 2013-01-24 15:37:55 +01:00
bsd-user misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
default-configs Add TEWS TPCI200 IndustryPack emulation 2013-01-14 13:26:12 -06:00
disas target-s390: Fix disassembly of cpsdr 2013-01-05 12:00:00 -08:00
docs usb: add usb-bot device (scsi bulk-only transport). 2013-01-22 11:09:54 +01:00
fpu softfloat: Implement uint64_to_float128 2013-01-05 10:12:50 +00:00
fsdev qemu-option: move standard option definitions out of qemu-config.c 2013-01-12 17:17:53 +01:00
gdb-xml
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hw Revert "serial: fix retry logic" 2013-01-24 09:45:03 -06:00
include add hierarchical bitmap data type and test cases 2013-01-25 18:18:32 +01:00
ldscripts build: create ldscripts/ 2012-12-19 08:29:06 +01:00
libcacard build: fold trace-obj-y into libqemuutil.a 2013-01-12 18:42:51 +01:00
linux-headers Update Linux kernel headers 2013-01-18 19:06:57 +01:00
linux-user alpha-linux-user: Correct select 2013-01-16 08:15:16 -08:00
net HMP: add QDict to info callback handler 2013-01-17 10:24:52 -02:00
pc-bios seabios: update to 1.7.2 release 2013-01-21 09:17:16 +01:00
pixman@97336fad32 qapi: move include files to include/qobject/ 2012-12-19 08:31:31 +01:00
qapi build: move base QAPI files to libqemuutil.a 2013-01-12 18:42:51 +01:00
qga Replace non-portable asprintf by g_strdup_printf 2013-01-19 10:24:43 +00:00
qobject build: move qobject files to qobject/ and libqemuutil.a 2013-01-12 18:42:50 +01:00
qom qom: Make object_resolve_path_component() path argument const 2013-01-15 10:54:23 +01:00
roms seabios: update to 1.7.2 release 2013-01-21 09:17:16 +01:00
scripts Merge branch 'ppc-for-upstream' of git://repo.or.cz/qemu/agraf 2013-01-12 12:47:02 +00:00
slirp slirp: remove unused field tt 2013-01-12 12:26:16 +00:00
stubs stubs: fully replace qemu-tool.c and qemu-user.c 2013-01-12 17:19:08 +01:00
sysconfigs/target Eliminate cpus-x86_64.conf file 2012-09-21 15:12:58 +02:00
target-alpha cpu: Move cpu_index field to CPUState 2013-01-15 04:09:13 +01:00
target-arm cpu: Move cpu_index field to CPUState 2013-01-15 04:09:13 +01:00
target-cris target-cris: Fix typo in D_LOG() macro 2013-01-24 11:28:15 +01:00
target-i386 sysbus: Drop sysbus_from_qdev() cast macro 2013-01-21 13:52:24 -06:00
target-lm32 cpu: Move cpu_index field to CPUState 2013-01-15 04:09:13 +01:00
target-m68k cpu: Move cpu_index field to CPUState 2013-01-15 04:09:13 +01:00
target-microblaze target-microblaze: Drop unused cpu_mb_close() prototype 2013-01-21 13:36:55 +01:00
target-mips exec: Return CPUState from qemu_get_cpu() 2013-01-15 04:09:14 +01:00
target-openrisc cpu: Move cpu_index field to CPUState 2013-01-15 04:09:13 +01:00
target-ppc PPC: KVM: Add support for EPR with KVM 2013-01-18 19:06:57 +01:00
target-s390x s390: Add a hypercall registration interface. 2013-01-18 19:07:47 +01:00
target-sh4 cpu: Move cpu_index field to CPUState 2013-01-15 04:09:13 +01:00
target-sparc cpu: Move cpu_index field to CPUState 2013-01-15 04:09:13 +01:00
target-unicore32 configure: allow disabling pixman if not needed 2012-12-23 14:38:52 -06:00
target-xtensa target-xtensa: fix search_pc for the last TB opcode 2012-12-22 12:09:24 +00:00
tcg tcg/target-arm: Add missing parens to assertions 2013-01-19 10:27:45 +00:00
tests add hierarchical bitmap data type and test cases 2013-01-25 18:18:32 +01:00
trace build: fold trace-obj-y into libqemuutil.a 2013-01-12 18:42:51 +01:00
ui vnc: fix possible uninitialized removals 2013-01-21 13:33:12 -06:00
util add hierarchical bitmap data type and test cases 2013-01-25 18:18:32 +01:00
.exrc qemu: add .exrc 2012-09-07 09:02:44 +03:00
.gitignore Add libcacard/trace/generated-tracers.c to .gitignore 2013-01-15 10:34:54 +01:00
.gitmodules pixman: add submodule 2012-11-01 13:10:06 +01:00
.mailmap Add a .mailmap to map pre-git-conversion authors to friendly names 2011-12-12 17:06:21 -06:00
CODING_STYLE Replace Qemu by QEMU in internal documentation 2012-04-07 13:58:25 +00:00
COPYING
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COPYING.LIB
…
Changelog fix some common typos 2012-05-14 07:27:24 +02:00
HACKING HACKING: List areas where we may rely on impdef C behaviour 2012-12-08 14:27:40 +00:00
LICENSE LICENSE: There is no libqemu.a anymore 2011-12-09 11:25:22 +00:00
MAINTAINERS Merge branch 's390-reorg' of git://repo.or.cz/qemu/rth 2013-01-12 12:46:57 +00:00
Makefile Makefile: drop recursive libcacard clean 2013-01-17 07:32:54 -06:00
Makefile.objs build: fold trace-obj-y into libqemuutil.a 2013-01-12 18:42:51 +01:00
Makefile.target build: improve quiet output for .stp rules 2013-01-12 18:42:51 +01:00
README Update README 2011-12-11 17:50:43 -06:00
TODO
…
VERSION Open up 1.4 development branch 2012-12-03 14:08:40 -06:00
aio-posix.c aio: Fix return value of aio_poll() 2013-01-17 10:51:42 +01:00
aio-win32.c aio: Fix return value of aio_poll() 2013-01-17 10:51:42 +01:00
arch_init.c Protect migration_bitmap_sync() with the ramlist lock 2013-01-17 13:27:07 +01:00
async.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
balloon.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
block-migration.c savevm: New save live migration method: pending 2012-12-20 23:09:25 +01:00
block.c block: clear dirty bitmap when discarding 2013-01-15 10:03:48 +01:00
blockdev-nbd.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
blockdev.c qemu-option: move standard option definitions out of qemu-config.c 2013-01-12 17:17:53 +01:00
blockjob.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
bt-host.c softmmu: move remaining include files to include/ subdirectories 2012-12-19 08:32:46 +01:00
bt-vhci.c softmmu: move remaining include files to include/ subdirectories 2012-12-19 08:32:46 +01:00
cmd.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
cmd.h
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configure vnc: added initial websocket protocol support 2013-01-21 13:33:12 -06:00
coroutine-gthread.c block: move include files to include/block/ 2012-12-19 08:31:31 +01:00
coroutine-sigaltstack.c block: move include files to include/block/ 2012-12-19 08:31:31 +01:00
coroutine-ucontext.c gcc: rename CONFIG_PRAGMA_DISABLE_UNUSED_BUT_SET to CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE 2013-01-12 12:42:53 +00:00
coroutine-win32.c block: move include files to include/block/ 2012-12-19 08:31:31 +01:00
cpu-exec.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
cpus.c kvm: Pass CPUState to kvm_init_vcpu() 2013-01-15 04:09:13 +01:00
cputlb.c exec: move include files to include/exec/ 2012-12-19 08:31:31 +01:00
device_tree.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
disas.c monitor: move include files to include/monitor/ 2012-12-19 08:31:32 +01:00
dma-helpers.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
dump-stub.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
dump.c exec: change RAM list to a TAILQ 2012-12-20 23:08:47 +01:00
exec.c Replace non-portable asprintf by g_strdup_printf 2013-01-19 10:24:43 +00:00
gdbstub.c cpu: Move cpu_index field to CPUState 2013-01-15 04:09:13 +01:00
hmp-commands.hx HMP: add sub command table to info 2013-01-17 10:24:52 -02:00
hmp.c HMP: add QDict to info callback handler 2013-01-17 10:24:52 -02:00
hmp.h HMP: add QDict to info callback handler 2013-01-17 10:24:52 -02:00
iohandler.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
ioport.c exec: move include files to include/exec/ 2012-12-19 08:31:31 +01:00
kvm-all.c kvm: add stub for kvm_irqchip_update_msi_route 2013-01-15 18:25:05 -06:00
kvm-stub.c kvm: Pass CPUState to kvm_init_vcpu() 2013-01-15 04:09:13 +01:00
main-loop.c Check return values from g_poll and select 2013-01-09 11:03:05 -06:00
memory.c memory: introduce memory_region_test_and_clear_dirty 2012-12-20 23:09:39 +01:00
memory_mapping-stub.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
memory_mapping.c exec: change RAM list to a TAILQ 2012-12-20 23:08:47 +01:00
migration-exec.c migration: make writes blocking 2012-12-20 23:09:25 +01:00
migration-fd.c migration: make writes blocking 2012-12-20 23:09:25 +01:00
migration-tcp.c migration: make writes blocking 2012-12-20 23:09:25 +01:00
migration-unix.c migration: make writes blocking 2012-12-20 23:09:25 +01:00
migration.c migration: remove argument to qemu_savevm_state_cancel 2013-01-17 13:54:52 +01:00
monitor.c HMP: add sub command table to info 2013-01-17 10:24:52 -02:00
nbd.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
os-posix.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
os-win32.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
page_cache.c migration: move include files to include/migration/ 2012-12-19 08:31:32 +01:00
qapi-schema-test.json qapi: add struct-errors test case to test-qmp-output-visitor 2012-03-27 09:11:00 -03:00
qapi-schema.json chardev: add pty chardev support to chardev-add (qmp) 2013-01-16 06:58:54 +01:00
qdict-test-data.txt
…
qemu-bridge-helper.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
qemu-char.c chardev: add pty chardev support to chardev-add (qmp) 2013-01-16 06:58:54 +01:00
qemu-coroutine-io.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
qemu-coroutine-lock.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
qemu-coroutine-sleep.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
qemu-coroutine.c block: move include files to include/block/ 2012-12-19 08:31:31 +01:00
qemu-doc.texi Documentation: Update image format information 2012-11-30 11:33:24 +01:00
qemu-img-cmds.hx qemu-img: document 'info --backing-chain' 2012-10-24 10:26:19 +02:00
qemu-img.c qemu-img: report size overflow error message 2013-01-02 16:08:56 +01:00
qemu-img.texi Documentation: Update image format information 2012-11-30 11:33:24 +01:00
qemu-io.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
qemu-log.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
qemu-nbd.c block: move include files to include/block/ 2012-12-19 08:31:31 +01:00
qemu-nbd.texi Replace Qemu by QEMU in user visible documentation 2012-04-07 13:58:06 +00:00
qemu-options-wrapper.h vl.c: In qemu -h output, only print options for the arch we are running as 2011-12-19 10:27:33 -06:00
qemu-options.h vl.c: Move option generation logic into a wrapper file 2011-12-19 10:27:33 -06:00
qemu-options.hx vnc: added initial websocket protocol support 2013-01-21 13:33:12 -06:00
qemu-seccomp.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
qemu-tech.texi qemu-tech.texi: update implemented xtensa features list 2012-11-29 13:00:52 -06:00
qemu-timer.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
qemu.sasl
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qmp-commands.hx chardev: add pty chardev support to chardev-add (qmp) 2013-01-16 06:58:54 +01:00
qmp.c softmmu: move remaining include files to include/ subdirectories 2012-12-19 08:32:46 +01:00
qtest.c softmmu: move remaining include files to include/ subdirectories 2012-12-19 08:32:46 +01:00
readline.c readline: avoid memcpy() of overlapping regions 2013-01-08 10:00:26 +01:00
rules.mak build: move version-obj-y to the generic LINK rule 2013-01-12 18:42:51 +01:00
savevm.c Merge remote-tracking branch 'quintela/thread.next' into staging 2013-01-21 13:22:43 -06:00
spice-qemu-char.c Merge remote-tracking branch 'bonzini/header-dirs' into staging 2012-12-19 17:15:39 -06:00
tcg-runtime.c
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tci.c exec: move include files to include/exec/ 2012-12-19 08:31:31 +01:00
thread-pool.c misc: move include files to include/qemu/ 2012-12-19 08:32:39 +01:00
thunk.c exec: move include files to include/exec/ 2012-12-19 08:31:31 +01:00
trace-events add hierarchical bitmap data type and test cases 2013-01-25 18:18:32 +01:00
translate-all.c translate-all.c: Use tb1->phys_hash_next directly in tb_remove 2012-12-22 12:06:24 +00:00
translate-all.h exec: move TB handling to translate-all.c 2012-12-16 08:28:41 +00:00
user-exec.c Merge remote-tracking branch 'bonzini/header-dirs' into staging 2012-12-19 17:15:39 -06:00
version.rc
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vl.c vl: Use size_t for sizes in get_boot_devices_list() 2013-01-19 10:22:48 +00:00
xen-all.c xen: Simplify halting of first CPU 2013-01-15 04:09:14 +01:00
xen-mapcache.c softmmu: move include files to include/sysemu/ 2012-12-19 08:32:45 +01:00
xen-stub.c exec: move include files to include/exec/ 2012-12-19 08:31:31 +01:00

README 

Read the documentation in qemu-doc.html or on http://wiki.qemu.org

- QEMU team