mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
32,314 Commits 50 Branches 394 Tags 404 MiB
C 82.6%
C++ 6.5%
Python 3.4%
Dylan 2.9%
Shell 1.6%
Other 2.8%
b03c38057b
Go to file
Peter Lieven b03c38057b block/iscsi: speed up read for unallocated sectors 
this patch implements a cache that tracks if a page on the
iscsi target is allocated or not. The cache is implemented in
a way that it allows for false positives
(e.g. pretending a page is allocated, but it isn't), but
no false negatives.

The cached allocation info is then used to speed up the
read process for unallocated sectors by issueing a GET_LBA_STATUS
request for all sectors that are not yet known to be allocated.
If the read request is confirmed to fall into an unallocated
range we directly return zeroes and do not transfer the
data over the wire.

Tests have shown that a relatively small amount of GET_LBA_STATUS
requests happens a vServer boot time to fill the allocation cache
(all those blocks are not queried again).

Not to transfer all the data of unallocated sectors saves a lot
of time, bandwidth and storage I/O load during block jobs or storage
migration and it saves a lot of bandwidth as well for any big sequential
read of the whole disk (e.g. block copy or speed tests) if a significant
number of blocks is unallocated.

Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-04-29 11:14:25 +02:00
audio Add the ability to vary Spice playback and record rates, to facilitate Opus support. 2014-02-03 11:05:15 +01:00
backends backends/baum.c: Fix compilation when SDL is not available. 2014-03-24 17:47:29 +00:00
block block/iscsi: speed up read for unallocated sectors 2014-04-29 11:14:25 +02:00
bsd-user cpu: Move opaque field from CPU_COMMON to CPUState 2014-03-13 19:20:47 +01:00
default-configs usb: mtp filesharing 2014-04-23 10:28:14 +02:00
disas libvixl: Fix format strings for several int64_t values 2014-03-10 14:56:29 +00:00
docs Docs: Introduce multiport serial support in qemupciserial.inf. 2014-03-12 15:03:42 +00:00
dtc@bc895d6d09
fpu softfloat: Introduce float32_to_uint64_round_to_zero 2014-04-08 11:20:00 +02:00
fsdev hw/9pfs: Include virtio-9p-device.o in build 2014-03-04 09:20:49 +05:30
gdb-xml target-arm: Support fp registers in gdb stub 2013-12-17 19:42:32 +00:00
hw megasas: Add MSI support 2014-04-28 13:51:13 +02:00
include Block patches 2014-04-25 12:22:37 +01:00
libcacard Add a 'name' parameter to qemu_thread_create 2014-03-09 21:09:38 +02:00
linux-headers update linux headers to kvm/next 2014-02-27 09:50:45 +01:00
linux-user target-arm: Define exception record for AArch64 exceptions 2014-04-17 21:34:03 +01:00
net net: Report error when device / hub combo is not found. 2014-04-18 10:33:36 +04:00
pc-bios pseries: Update SLOF firmware image to qemu-slof-20140404 2014-04-08 11:20:00 +02:00
pixman@97336fad32
po po: Update all *.po files 2013-08-07 12:48:00 -05:00
qapi qapi: Add missing null check to opts_start_struct() 2014-03-03 11:17:45 -05:00
qga qga: trivial fix for unclear documentation of guest-set-time 2014-04-18 10:33:36 +04:00
qobject qdict: Extract non-QDicts in qdict_array_split() 2014-02-21 22:11:23 +01:00
qom qom: Fix crash with qom-list and link properties 2014-04-11 17:57:36 +01:00
roms pseries: Update SLOF firmware image to qemu-slof-20140404 2014-04-08 11:20:00 +02:00
scripts scripts: add sample model file for Coverity Scan 2014-04-18 10:33:36 +04:00
slirp Fixed various typos 2014-03-25 14:09:50 +01:00
stubs blockdev: Refuse to open encrypted image unless paused 2014-03-14 16:24:42 +01:00
sysconfigs/target
target-alpha target-alpha: Remove cpu_unique, cpu_sysval, cpu_usp 2014-04-17 11:47:42 -07:00
target-arm target-arm: A64: fix unallocated test of scalar SQXTUN 2014-04-17 21:34:07 +01:00
target-cris cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-i386 target-i386: reorder fields in cpu/msr_hyperv_hypercall subsection 2014-04-05 10:49:05 +01:00
target-lm32 cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-m68k cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-microblaze cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-mips target-mips: Avoid shifting left into sign bit 2014-03-27 19:22:49 +04:00
target-moxie cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-openrisc cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-ppc PPC: Add l1 cache sizes for 970 and above systems 2014-04-08 11:20:06 +02:00
target-s390x target-s390x: Add missing 'static' and 'const' attributes 2014-03-27 19:22:48 +04:00
target-sh4 cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-sparc target-sparc: fix 32bit integer division overflow 2014-03-26 23:40:40 +00:00
target-unicore32 cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
target-xtensa cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
tcg Pull tcg 2014-04-22 2014-04-24 15:24:52 +01:00
tests qemu-iotests: Check common namespace for id and node-name 2014-04-22 12:12:30 +02:00
trace osdep: initialize glib threads in all QEMU tools 2014-03-25 13:39:31 +01:00
ui input: sdl2: Fix relative mode to match SDL1 behavior 2014-04-11 12:19:16 +02:00
util acpi,pc,build bug fixes 2014-03-28 13:46:29 +00:00
.exrc
.gitignore Add qga/qapi-generated to .gitignore 2014-03-15 13:54:18 +04:00
.gitmodules Add OpenHack'Ware submodule 2014-03-12 17:26:32 +01:00
.mailmap Update mailmap 2013-09-05 09:40:31 -05:00
.travis.yml .travis.yml: add IRC notifications for build failures 2014-03-15 13:54:18 +04:00
aio-posix.c aio: make aio_poll(ctx, true) block with no fds 2013-12-06 16:53:51 +01:00
aio-win32.c aio: make aio_poll(ctx, true) block with no fds 2013-12-06 16:53:51 +01:00
arch_init.c XBZRLE: Fix qemu crash when resize the xbzrle cache 2014-03-08 22:22:34 +01:00
async.c aio: add aio_context_acquire() and aio_context_release() 2014-03-13 14:42:24 +01:00
balloon.c
block-migration.c block: Handle error of bdrv_getlength in bdrv_create_dirty_bitmap 2014-04-22 11:57:02 +02:00
block.c block: Catch duplicate IDs in bdrv_new() 2014-04-22 12:00:28 +02:00
blockdev-nbd.c nbd: use BlockDriverState refcnt 2013-09-06 15:25:08 +02:00
blockdev.c block: Catch duplicate IDs in bdrv_new() 2014-04-22 12:00:28 +02:00
blockjob.c Use error_is_set() only when necessary 2014-02-17 11:57:23 -05:00
bt-host.c
bt-vhci.c
Changelog Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
CODING_STYLE CODING_STYLE: Section about mixed declarations 2014-03-27 19:22:49 +04:00
configure configure: Remove redundant message for -Werror 2014-04-18 10:33:36 +04:00
COPYING
COPYING.LIB
coroutine-gthread.c
coroutine-sigaltstack.c
coroutine-ucontext.c
coroutine-win32.c
cpu-exec.c cpu-exec: Unlock tb_lock if we longjmp out of code generation 2014-04-04 18:29:25 +01:00
cpus.c cpu: Move icount_decr field from CPU_COMMON to CPUState 2014-03-13 19:20:46 +01:00
cputlb.c cputlb: Change tlb_set_page() argument to CPUState 2014-03-13 19:52:47 +01:00
device_tree.c device_tree: qemu_fdt_setprop: Rename val_array arg 2013-12-20 01:58:12 +01:00
device-hotplug.c hw/boards: Convert current_machine to MachineState 2014-03-12 20:13:02 +01:00
disas.c disas: Implement disassembly output for A64 2014-02-08 14:50:48 +00:00
dma-helpers.c dma-helpers: Initialize DMAAIOCB in_cancel flag 2014-04-04 19:36:39 +02:00
dump.c dump: add 'query-dump-guest-memory-capability' command 2014-02-28 11:52:03 -05:00
exec.c exec: Fix CPU rework fallout 2014-03-19 19:47:15 +01:00
gdbstub.c exec: Change cpu_breakpoint_{insert,remove{,_by_ref,_all}} argument 2014-03-13 19:20:48 +01:00
HACKING HACKING: Document vaddr type usage 2013-07-23 02:41:31 +02:00
hmp-commands.hx block: update block commit documentation regarding image truncation 2014-01-24 16:12:49 +01:00
hmp.c dump: make kdump-compressed format available for 'dump-guest-memory' 2014-02-28 11:52:03 -05:00
hmp.h monitor: add object-add (QMP) and object_add (HMP) command 2014-01-06 13:45:47 -05:00
iohandler.c
ioport.c portio: Allow to mark portio lists as coalesced MMIO flushing 2013-10-17 17:24:15 +02:00
iothread.c iothread: make IOThread struct definition public 2014-04-04 20:48:02 +02:00
kvm-all.c Revert "fix return check for KVM_GET_DIRTY_LOG ioctl" 2014-04-14 15:40:02 +01:00
kvm-stub.c Revert "KVM: Split QEMUMachine typedef into separate header" 2014-03-13 03:49:48 +01:00
LICENSE LICENSE: clarify 2013-08-12 09:15:12 -05:00
main-loop.c main-loop: Suppress "I/O thread spun" warnings for qtest 2014-03-13 21:36:50 +01:00
MAINTAINERS MAINTAINERS: mark megasas as maintained 2014-04-28 13:51:23 +02:00
Makefile Makefile: add qga-vss-dll-obj-y to nested variables 2014-04-07 14:39:19 -05:00
Makefile.objs iothread: add I/O thread object 2014-03-13 14:42:24 +01:00
Makefile.target build: softmmu targets do not have a "main.o" file 2014-02-20 13:14:18 +01:00
memory_mapping.c cpu: Use QTAILQ for CPU list 2013-09-03 12:25:55 +02:00
memory.c memory_region_present: return false if address is not found in child MemoryRegion 2014-03-09 21:09:37 +02:00
migration-exec.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration-fd.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration-rdma.c rdma: rename 'x-rdma' => 'rdma' 2014-02-25 14:30:28 +01:00
migration-tcp.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration-unix.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
migration.c migration: add more traces 2014-03-27 15:19:00 +05:30
module-common.c module: implement module loading 2014-02-20 13:14:18 +01:00
monitor.c input: mouse: switch monitor to new core 2014-03-05 09:52:03 +01:00
nbd.c nbd: move socket wrappers to qemu-nbd 2014-02-21 21:02:23 +01:00
os-posix.c oslib-posix: Fix build on FreeBSD 2014-03-13 14:34:16 +00:00
os-win32.c util: Split out exec_dir from os_find_datadir 2014-02-20 13:12:54 +01:00
page_cache.c Fix two XBZRLE corruption issues 2014-02-25 14:30:28 +01:00
qapi-schema.json virtio-net: add vlan receive state to RxFilterInfo 2014-03-26 12:49:10 +02:00
qdev-monitor.c qdev-monitor: Set properties after parent is assigned in device_add 2014-03-12 20:13:02 +01:00
qdict-test-data.txt
qemu-bridge-helper.c
qemu-char.c char: restore read callback on a reattached (hotplug) chardev 2014-03-13 10:33:45 +01:00
qemu-coroutine-io.c aio / timers: Untangle include files 2013-08-22 19:10:27 +02:00
qemu-coroutine-lock.c coroutine: remove qemu_co_queue_wait_insert_head 2013-12-02 17:11:49 +01:00
qemu-coroutine-sleep.c coroutine: add co_aio_sleep_ns() to allow sleep in block drivers 2013-10-30 12:22:09 +01:00
qemu-coroutine.c coroutine: add ./configure --disable-coroutine-pool 2013-09-12 10:12:48 +02:00
qemu-doc.texi doc: grammify "allows to" 2014-04-18 10:33:36 +04:00
qemu-file.c migration: add more traces 2014-03-27 15:19:00 +05:30
qemu-img-cmds.hx qemu-img: add -l for snapshot in convert 2013-12-04 15:19:00 +01:00
qemu-img.c qemu-img: Improve error messages 2014-04-22 13:47:46 +02:00
qemu-img.texi Describe flaws in qcow/qcow2 encryption in the docs 2014-01-31 22:05:03 +01:00
qemu-io-cmds.c qemu-io-cmds: Fixed typo in example for writev. 2014-03-19 09:39:41 +01:00
qemu-io.c block: Add errp to bdrv_new() 2014-04-22 12:00:20 +02:00
qemu-log.c
qemu-nbd.c block: Add errp to bdrv_new() 2014-04-22 12:00:20 +02:00
qemu-nbd.texi qemu-nbd: add doc for option -f 2013-12-04 15:19:00 +01:00
qemu-options-wrapper.h
qemu-options.h
qemu-options.hx doc: grammify "allows to" 2014-04-18 10:33:36 +04:00
qemu-seccomp.c seccomp: add some basic shared memory syscalls to the whitelist 2014-01-20 11:19:34 -02:00
qemu-tech.texi
qemu-timer.c timer: add timer_mod_anticipate and timer_mod_anticipate_ns 2013-10-17 17:31:00 +02:00
qemu.nsi nsis: Improved support for parallel installation of 32 and 64 bit code 2013-11-07 07:02:44 +01:00
qemu.sasl sasl: Avoid 'Could not find keytab file' in syslog 2014-03-15 13:54:18 +04:00
qmp-commands.hx virtio-net: add vlan receive state to RxFilterInfo 2014-03-26 12:49:10 +02:00
qmp.c hw/boards: Convert current_machine to MachineState 2014-03-12 20:13:02 +01:00
qtest.c kvm: Add a new machine option kvm-type 2014-03-05 03:06:24 +01:00
README Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
rules.mak rules.mak: Fix per object libs extraction 2014-03-17 13:21:11 +01:00
savevm.c migration: add more traces 2014-03-27 15:19:00 +05:30
spice-qemu-char.c spice: hook qemu_chr_fe_set_open() event to ports 2014-02-03 11:05:15 +01:00
tcg-runtime.c
tci.c tci: Mask shift counts to avoid undefined behavior 2014-04-18 16:57:36 -07:00
thread-pool.c Add a 'name' parameter to qemu_thread_create 2014-03-09 21:09:38 +02:00
thunk.c
tpm.c Use error_is_set() only when necessary 2014-02-17 11:57:23 -05:00
trace-events megasas: Add MSI support 2014-04-28 13:51:13 +02:00
translate-all.c page_check_range: don't bail out early after unprotecting page 2014-04-04 18:16:03 +01:00
translate-all.h translate-all: Change tb_check_watchpoint() argument to CPUState 2014-03-13 19:20:48 +01:00
user-exec.c tcg-aarch64: Properly detect SIGSEGV writes 2014-04-16 12:12:32 -04:00
VERSION Open 2.1 development tree 2014-04-17 20:39:32 +01:00
version.rc Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
vl.c vl: Report accelerator not supported for target more nicely 2014-04-18 10:33:36 +04:00
vmstate.c migration: add more traces 2014-03-27 15:19:00 +05:30
xbzrle.c xbzrle.c: Avoid undefined behaviour with signed arithmetic 2014-04-18 10:33:36 +04:00
xen-all.c kvm: Add a new machine option kvm-type 2014-03-05 03:06:24 +01:00
xen-mapcache.c
xen-stub.c kvm: Add a new machine option kvm-type 2014-03-05 03:06:24 +01:00

README 

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

- QEMU team