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Stefan Hajnoczi de6c8042ec virtio-blk: Avoid zeroing every request structure 
The VirtIOBlockRequest structure is about 40 KB in size.  This patch
avoids zeroing every request by only initializing fields that are read.
The other fields are either written to or may not be used at all.

Oprofile shows about 10% of CPU samples in memset called by
virtio_blk_alloc_request().  The workload is
dd if=/dev/vda of=/dev/null iflag=direct bs=8k running concurrently 4
times.  This patch makes memset disappear to the bottom of the profile.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-05-21 11:49:18 +02:00
audio
audio/sdlaudio: remove unused variable
2010-04-22 15:21:53 +04:00
block
block/vdi: Fix image opening and creation for odd disk sizes
2010-05-17 10:20:05 +02:00
bsd-user
…
darwin-user
darwin-user: Add missing static attribute
2010-05-07 16:28:12 +00:00
default-configs
Compile acpi_piix4, apm and pm_smbus only once
2010-05-17 19:32:37 +00:00
docs
…
fpu
…
fsdev
virtio-9p: Add a virtio 9p device to qemu
2010-05-03 12:17:37 -05:00
gdb-xml
…
hw
virtio-blk: Avoid zeroing every request structure
2010-05-21 11:49:18 +02:00
linux-user
linux-user: fix 32-bit host breakage
2010-05-19 18:39:11 +02:00
net
Remove dead assignments in various common files, spotted by clang analyzer
2010-04-25 18:35:52 +00:00
pc-bios
target-s390: add firmware code
2010-05-18 21:12:48 +02:00
QMP
QMP: Introduce RESUME event
2010-05-03 12:39:12 -05:00
roms
Update SeaBIOS
2010-05-14 10:55:58 -05:00
slirp
Remove dead assignments in various common files, spotted by clang analyzer
2010-04-25 18:35:52 +00:00
sysconfigs/target
…
target-alpha
target-alpha: Implement RPCC.
2010-04-27 05:50:42 +02:00
target-arm
arm: remove dead assignments, spotted by clang analyzer
2010-04-25 19:31:06 +00:00
target-cris
Fix __VA__ARGS__ typo in cris mmu.c
2010-05-19 19:29:24 +02:00
target-i386
kvm: fix 80000001.EDX supported bit filtering
2010-05-11 17:07:36 -03:00
target-m68k
m68k: remove dead assignments, spotted by clang analyzer
2010-04-25 19:50:51 +00:00
target-microblaze
microblaze: Update elf machine nums.
2010-05-19 15:24:17 +02:00
target-mips
target-mips: Remove duplicate CPU log.
2010-05-05 12:20:05 +02:00
target-ppc
PPC/KVM: make iothread work
2010-05-18 20:21:00 +02:00
target-s390x
target-s390: enable SIGP Initial Reset
2010-05-18 21:23:24 +02:00
target-sh4
target-sh4: Remove duplicate CPU log.
2010-05-05 12:20:05 +02:00
target-sparc
target-sparc: Inline some generation of carry for ADDX/SUBX.
2010-05-20 19:58:28 +00:00
tcg
tcg-i386: Tidy jumps.
2010-05-20 21:15:25 +02:00
tests
Add missing 'static' attribute
2010-05-07 16:28:10 +00:00
.gitignore
Remove i386 from .gitignore
2010-05-20 21:04:47 +02:00
.gitmodules
…
a.out.h
…
acl.c
…
acl.h
…
aes.c
…
aes.h
…
aio.c
block: fix aio_flush segfaults for read-only protocols (e.g. curl)
2010-05-21 11:49:18 +02:00
alpha-dis.c
…
alpha.ld
…
arch_init.c
…
arch_init.h
…
arm-dis.c
arm: remove dead assignments, spotted by clang analyzer
2010-04-25 19:31:06 +00:00
arm-semi.c
…
arm.ld
…
async.c
…
balloon.c
…
balloon.h
…
block_int.h
block: Add wr_highest_sector blockstat
2010-05-03 10:07:32 +02:00
block-migration.c
block: Do not export bdrv_first
2010-04-23 16:21:57 +02:00
block-migration.h
…
block.c
block: Remove special case for vvfat
2010-05-17 10:20:05 +02:00
block.h
block: Remove semicolon in BDRV_SECTOR_MASK macro
2010-05-17 10:20:04 +02:00
bswap.h
introduce leul_to_cpu
2010-04-28 13:41:14 -03:00
bt-host.c
bt: remove dead assignments, spotted by clang analyzer
2010-04-25 18:20:28 +00:00
bt-host.h
…
bt-vhci.c
…
buffered_file.c
…
buffered_file.h
…
cache-utils.c
…
cache-utils.h
…
Changelog
…
check-qdict.c
…
check-qfloat.c
…
check-qint.c
…
check-qjson.c
…
check-qlist.c
…
check-qstring.c
…
cmd.c
Fix dead initialization, spotted by clang analyzer
2010-04-25 15:27:14 +00:00
cmd.h
…
cocoa.m
…
CODING_STYLE
…
config.h
…
configure
Fix cross compilation
2010-05-19 08:46:10 +02:00
console.c
Remove dead assignments in various common files, spotted by clang analyzer
2010-04-25 18:35:52 +00:00
console.h
…
COPYING
…
COPYING.LIB
…
cpu-all.h
add cpu_is_stopped helper
2010-05-11 14:02:22 -03:00
cpu-common.h
Remove IO_MEM_SUBWIDTH.
2010-04-25 12:59:33 +00:00
cpu-defs.h
move stop/stopped CPU_COMMON fields after area zeroed by reset
2010-05-11 14:02:22 -03:00
cpu-exec.c
make SIG_IPI to tcg vcpu thread reliable
2010-05-11 14:02:22 -03:00
cpus.c
cpus: add one 'const'
2010-05-14 19:32:21 +00:00
cpus.h
Fix cpu list("-cpu ?") breakage, spotted by TeLeMan
2010-05-04 19:55:35 +00:00
create_config
…
cris-dis.c
…
curses_keys.h
…
curses.c
…
cutils.c
…
d3des.c
…
d3des.h
…
def-helper.h
…
device_tree.c
…
device_tree.h
…
dis-asm.h
…
disas.c
…
disas.h
…
dma-helpers.c
…
dma.h
…
dyngen-exec.h
…
elf.h
microblaze: Update elf machine nums.
2010-05-19 15:24:17 +02:00
envlist.c
…
envlist.h
…
exec-all.h
make SIG_IPI to tcg vcpu thread reliable
2010-05-11 14:02:22 -03:00
exec.c
Fix -mem-path with hugetlbfs
2010-05-11 14:02:21 -03:00
feature_to_c.sh
…
gdbstub.c
sparc: Fix lazy flag calculation on interrupts, refactor
2010-05-09 20:19:04 +00:00
gdbstub.h
…
gen-icount.h
…
host-utils.c
…
host-utils.h
…
hpet.h
…
hppa-dis.c
…
hppa.ld
…
hxtool
…
i386-dis.c
…
i386.ld
…
ia64-dis.c
Update to a hopefully more future proof FSF address
2010-05-15 17:52:49 +00:00
ia64.ld
…
input.c
…
ioport-user.c
…
ioport.c
…
ioport.h
…
iov.c
iov: Move from hw/ to topdir
2010-05-10 11:36:03 -05:00
iov.h
iov: Move from hw/ to topdir
2010-05-10 11:36:03 -05:00
json-lexer.c
…
json-lexer.h
…
json-parser.c
…
json-parser.h
…
json-streamer.c
…
json-streamer.h
…
keymaps.c
…
keymaps.h
…
kvm-all.c
Do not stop VM if emulation failed in userspace.
2010-05-11 14:03:44 -03:00
kvm-stub.c
provide a stub version of kvm-all.c if !CONFIG_KVM
2010-04-19 18:59:30 +00:00
kvm.h
Do not stop VM if emulation failed in userspace.
2010-05-11 14:03:44 -03:00
libfdt_env.h
…
LICENSE
…
linux-aio.c
linux-aio: Fix typo in read() EINTR check
2010-04-23 16:21:57 +02:00
m68k-dis.c
m68k-dis: fix unused return value, spotted by clang
2010-04-23 19:22:17 +00:00
m68k-semi.c
…
m68k.ld
…
MAINTAINERS
…
Makefile
target-s390: add firmware code
2010-05-18 21:12:48 +02:00
Makefile.dis
…
Makefile.hw
…
Makefile.objs
Compile acpi_piix4, apm and pm_smbus only once
2010-05-17 19:32:37 +00:00
Makefile.target
Compile acpi_piix4, apm and pm_smbus only once
2010-05-17 19:32:37 +00:00
Makefile.user
…
microblaze-dis.c
microblaze: fix custom fprintf
2010-04-27 18:56:11 +00:00
migration-exec.c
…
migration-fd.c
…
migration-tcp.c
…
migration-unix.c
…
migration.c
…
migration.h
…
mips-dis.c
mips-dis: Add missing static attributes
2010-05-09 06:47:20 +00:00
mips.ld
…
module.c
…
module.h
…
monitor.c
sparc: Fix lazy flag calculation on interrupts, refactor
2010-05-09 20:19:04 +00:00
monitor.h
QMP: Introduce RESUME event
2010-05-03 12:39:12 -05:00
nbd.c
…
nbd.h
…
net-checksum.c
…
net.c
monitor: Convert do_set_link() to QObject, QError
2010-04-18 23:55:19 +02:00
net.h
monitor: Convert do_set_link() to QObject, QError
2010-04-18 23:55:19 +02:00
notify.c
…
notify.h
…
osdep.c
…
osdep.h
…
path.c
…
pci-ids.txt
…
poison.h
…
posix-aio-compat.c
…
ppc64.ld
…
ppc-dis.c
…
ppc.ld
…
qbool.c
…
qbool.h
…
qdict-test-data.txt
…
qdict.c
…
qdict.h
…
qemu_socket.h
…
qemu-aio.h
…
qemu-barrier.h
…
qemu-binfmt-conf.sh
…
qemu-char.c
stash away SCM_RIGHTS fd until a getfd command arrives
2010-04-26 16:36:31 -03:00
qemu-char.h
…
qemu-common.h
port qemu-kvm's on_vcpu code
2010-05-11 14:02:22 -03:00
qemu-config.c
virtio-9p: Create a syntactic shortcut for the file-system pass-thru
2010-05-03 12:17:39 -05:00
qemu-config.h
virtio-9p: Create a syntactic shortcut for the file-system pass-thru
2010-05-03 12:17:39 -05:00
qemu-doc.texi
…
qemu-error.c
…
qemu-error.h
…
qemu-img-cmds.hx
qemu-img: Add 'resize' command to grow/shrink disk images
2010-05-03 10:07:32 +02:00
qemu-img.c
qemu-img rebase: Fix output image corruption
2010-05-03 10:07:32 +02:00
qemu-img.texi
qemu-img: Add 'resize' command to grow/shrink disk images
2010-05-03 10:07:32 +02:00
qemu-io.c
block: get rid of the BDRV_O_FILE flag
2010-04-23 16:08:46 +02:00
qemu-lock.h
…
qemu-log.h
…
qemu-malloc.c
…
qemu-monitor.hx
doc: Clean up monitor command function index
2010-05-10 11:36:04 -05:00
qemu-nbd.c
qemu-nbd: Improve error reporting
2010-05-17 10:20:04 +02:00
qemu-nbd.texi
…
qemu-objects.h
…
qemu-option.c
Fix tiny leak in qemu_opts_parse
2010-05-03 12:09:48 -05:00
qemu-option.h
…
qemu-options.hx
virtio-9p: Create a syntactic shortcut for the file-system pass-thru
2010-05-03 12:17:39 -05:00
qemu-queue.h
…
qemu-sockets.c
qemu-sockets: avoid strlen of NULL pointer
2010-05-18 19:49:16 +02:00
qemu-tech.texi
…
qemu-thread.c
…
qemu-thread.h
…
qemu-timer.c
…
qemu-timer.h
Implement cpu_get_real_ticks for Alpha.
2010-04-27 05:50:42 +02:00
qemu-tool.c
…
qemu-x509.h
…
qemu.sasl
…
qerror.c
QError: Improve QERR_QMP_BAD_INPUT_OBJECT desc
2010-04-26 11:17:14 -03:00
qerror.h
QError: New QERR_QMP_BAD_INPUT_OBJECT_MEMBER
2010-04-26 11:17:02 -03:00
qfloat.c
…
qfloat.h
…
qint.c
…
qint.h
…
qjson.c
…
qjson.h
…
qlist.c
…
qlist.h
…
qobject.h
…
qstring.c
…
qstring.h
…
readline.c
…
readline.h
…
README
…
rules.mak
fix whitespace bogon in some versions of make
2010-05-03 12:39:53 -05:00
rwhandler.c
…
rwhandler.h
…
s390-dis.c
…
s390.ld
…
savevm.c
vmstate: Add support for alias ID
2010-05-15 14:23:31 +00:00
sdl_keysym.h
…
sdl_zoom_template.h
…
sdl_zoom.c
…
sdl_zoom.h
…
sdl.c
…
sh4-dis.c
…
softmmu_defs.h
…
softmmu_exec.h
sparc64: handle asi referencing nucleus and secondary MMU contexts
2010-05-06 23:14:26 +03:00
softmmu_header.h
…
softmmu_template.h
…
softmmu-semi.h
…
sparc64.ld
…
sparc-dis.c
sparc64: more ultrasparc asi extensions for disassembler
2010-05-06 20:13:02 +00:00
sparc.ld
…
sysemu.h
Monitor: Return before exiting with 'quit'
2010-04-26 16:36:01 -03:00
targphys.h
…
tcg-runtime.c
…
texi2pod.pl
…
thunk.c
…
thunk.h
…
TODO
…
translate-all.c
…
uboot_image.h
…
usb-bsd.c
…
usb-linux.c
Changes to usb-linux to conform to coding style
2010-05-03 12:39:53 -05:00
usb-stub.c
…
VERSION
…
vgafont.h
…
vl.c
fix chardev_init for win32
2010-05-18 19:56:59 +02:00
vnc_keysym.h
…
vnc-auth-sasl.c
vnc: Fix compile error on x86_64 with -D_VNC_DEBUG=1
2010-05-03 12:09:22 -05:00
vnc-auth-sasl.h
…
vnc-auth-vencrypt.c
…
vnc-auth-vencrypt.h
…
vnc-encoding-hextile.c
vnc: split encoding in specific files
2010-05-03 12:09:47 -05:00
vnc-encoding-zlib.c
vnc: split encoding in specific files
2010-05-03 12:09:47 -05:00
vnc-tls.c
…
vnc-tls.h
…
vnc.c
vnc: set the right prefered encoding
2010-05-10 11:36:03 -05:00
vnc.h
vnc: split encoding in specific files
2010-05-03 12:09:47 -05:00
vnchextile.h
…
x86_64.ld
…
x_keymap.c
…
x_keymap.h
…

README 

Read the documentation in qemu-doc.html.

Fabrice Bellard.
Description
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Readme 404 MiB
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