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Paolo Bonzini 7c9b2bf677 qemu-thread: add a fast path to the Win32 QemuEvent 
QemuEvents are used heavily by call_rcu.  We do not want them to be slow,
but the current implementation does a kernel call on every invocation
of qemu_event_* and won't cut it.

So, wrap a Win32 manual-reset event with a fast userspace path.  The
states and transitions are the same as for the futex and mutex/condvar
implementations, but the slow path is different of course.  The idea
is to reset the Win32 event lazily, as part of a test-reset-test-wait
sequence.  Such a sequence is, indeed, how QemuEvents are used by
RCU and other subsystems!

The patch includes a formal model of the algorithm.

Tested-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
2015-09-24 20:52:28 +02:00
audio ossaudio: fix memory leak 2015-07-08 13:11:01 +02:00
backends qemu-char: Use g_new() & friends where that makes obvious sense 2015-09-16 17:33:33 +02:00
block Block layer patches (v2) 2015-09-14 18:51:09 +01:00
bsd-user * Support for jemalloc 2015-09-14 16:13:16 +01:00
crypto crypto: introduce new module for handling TLS sessions 2015-09-15 15:07:43 +01:00
default-configs spapr: Initialize hotplug memory address space 2015-09-23 10:51:10 +10:00
disas typofixes - v4 2015-09-11 10:45:43 +03:00
docs qemu-thread: add a fast path to the Win32 QemuEvent 2015-09-24 20:52:28 +02:00
dtc@65cc4d2748 dtc: Update dtc / libfdt submodule to version 1.4.0 2015-06-03 23:56:49 +02:00
fpu target-s390x: define default NaN values 2015-06-05 01:37:58 +02:00
fsdev maint: remove unused include for dirent.h 2015-09-11 10:21:38 +03:00
gdb-xml s390x/gdb: support reading/writing of control registers 2015-09-07 16:10:43 +02:00
hw Remove libcacard 2015-09-24 17:04:31 +01:00
include qemu-thread: add a fast path to the Win32 QemuEvent 2015-09-24 20:52:28 +02:00
libdecnumber typofixes - v4 2015-09-11 10:45:43 +03:00
linux-headers target-i386: move asm-x86/hyperv.h to standard-headers 2015-09-16 17:33:32 +02:00
linux-user target-ppc: Fix SRR0 when taking unaligned exceptions 2015-09-20 22:48:39 +02:00
migration maint: avoid useless "if (foo) free(foo)" pattern 2015-09-11 10:21:38 +03:00
net trivial: remove trailing newline from error_report 2015-09-11 10:21:38 +03:00
pc-bios pseries: Update SLOF firmware image to qemu-slof-20150813 2015-09-23 10:51:09 +10:00
pixman@87eea99e44 pixman: update internal copy to pixman-0.32.6 2014-09-15 08:14:19 +02:00
po Update language files for QEMU 2.4.0 2015-09-11 10:21:38 +03:00
qapi qapi-introspect: Hide type names 2015-09-21 09:56:49 +02:00
qga typofixes - v4 2015-09-11 10:45:43 +03:00
qobject Include qapi/qmp/qerror.h exactly where needed 2015-06-22 18:20:41 +02:00
qom qom: Fix invalid error check in property_get_str() 2015-09-19 08:10:12 +02:00
roms pseries: Update SLOF firmware image to qemu-slof-20150813 2015-09-23 10:51:09 +10:00
scripts qapi-introspect: Hide type names 2015-09-21 09:56:49 +02:00
slirp slirp: Fix non blocking connect for w32 2015-09-24 20:52:28 +02:00
stubs monitor: remove target-specific code from monitor.c 2015-09-16 17:33:32 +02:00
target-alpha tlb: Add "ifetch" argument to cpu_mmu_index() 2015-09-11 08:15:28 -07:00
target-arm hw/intc: Initial implementation of vGICv3 2015-09-24 01:29:37 +01:00
target-cris target-cris: update CPU state save/load to use VMStateDescription 2015-09-17 14:31:38 +01:00
target-i386 * Linux header update and cleanup 2015-09-16 18:06:54 +01:00
target-lm32 tlb: Add "ifetch" argument to cpu_mmu_index() 2015-09-11 08:15:28 -07:00
target-m68k tlb: Add "ifetch" argument to cpu_mmu_index() 2015-09-11 08:15:28 -07:00
target-microblaze tlb: Add "ifetch" argument to cpu_mmu_index() 2015-09-11 08:15:28 -07:00
target-mips target-mips: improve exception handling 2015-09-18 12:07:24 +01:00
target-moxie tlb: Add "ifetch" argument to cpu_mmu_index() 2015-09-11 08:15:28 -07:00
target-openrisc tlb: Add "ifetch" argument to cpu_mmu_index() 2015-09-11 08:15:28 -07:00
target-ppc ppc/spapr: Implement H_RANDOM hypercall in QEMU 2015-09-23 10:51:11 +10:00
target-s390x * Support for jemalloc 2015-09-14 16:13:16 +01:00
target-sh4 monitor: remove target-specific code from monitor.c 2015-09-16 17:33:32 +02:00
target-sparc monitor: remove target-specific code from monitor.c 2015-09-16 17:33:32 +02:00
target-tilegx target-tilegx: Handle v1shl, v1shru, v1shrs 2015-09-15 07:45:34 -07:00
target-tricore tlb: Add "ifetch" argument to cpu_mmu_index() 2015-09-11 08:15:28 -07:00
target-unicore32 tlb: Add "ifetch" argument to cpu_mmu_index() 2015-09-11 08:15:28 -07:00
target-xtensa monitor: remove target-specific code from monitor.c 2015-09-16 17:33:32 +02:00
tcg tcg/mips: pass oi to tcg_out_tlb_load 2015-09-19 11:53:15 +02:00
tests qapi: New QMP command query-qmp-schema for QMP introspection 2015-09-21 09:56:49 +02:00
trace Remove superfluous '\n' around error_report() 2015-03-10 08:15:33 +03:00
ui spice: surface switch fast path requires same format too. 2015-09-21 09:52:07 +02:00
util qemu-thread: add a fast path to the Win32 QemuEvent 2015-09-24 20:52:28 +02:00
.exrc qemu: add .exrc 2012-09-07 09:02:44 +03:00
.gitignore libcacard: use the standalone project 2015-09-23 23:34:17 +02:00
.gitmodules PPC: Add u-boot firmware for e500 2014-06-16 13:24:35 +02:00
.mailmap Update mailmap 2013-09-05 09:40:31 -05:00
.travis.yml .travis.yml: Add "--enable-modules" 2015-01-26 12:27:05 +01:00
accel.c accel: Create accel object when initializing machine 2014-10-09 15:36:14 +02:00
aio-posix.c AioContext: optimize clearing the EventNotifier 2015-07-22 12:41:40 +01:00
aio-win32.c AioContext: optimize clearing the EventNotifier 2015-07-22 12:41:40 +01:00
arch_init.c smbios: move smbios code into a common folder 2015-08-13 14:08:30 +03:00
async.c AioContext: force event loop iteration using BH 2015-07-29 10:02:06 +01:00
balloon.c Include monitor/monitor.h exactly where needed 2015-06-22 18:20:41 +02:00
block.c block: Allow specifying driver-specific options to reopen 2015-09-14 16:51:36 +02:00
blockdev-nbd.c Include monitor/monitor.h exactly where needed 2015-06-22 18:20:41 +02:00
blockdev.c block: Drop drv parameter from bdrv_open() 2015-09-14 16:51:36 +02:00
blockjob.c blockjob: add block_job_release function 2015-07-07 14:27:14 +01:00
bootdevice.c misc: fix typos in copyright declaration 2015-03-26 14:21:43 +01:00
bt-host.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
bt-vhci.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
Changelog Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
CODING_STYLE CODING_STYLE: update mixed declaration rules 2015-09-09 15:34:54 +02:00
configure libcacard: use the standalone project 2015-09-23 23:34:17 +02:00
COPYING
COPYING.LIB
coroutine-gthread.c glib-compat.h: add new thread API emulation on top of pre-2.31 API 2014-06-10 07:44:01 +02:00
coroutine-sigaltstack.c coroutine-sigaltstack: Change jmp_buf to sigjmp_buf 2014-11-11 11:07:55 +03:00
coroutine-ucontext.c coroutine-ucontext: use __thread 2015-01-13 13:43:28 +00:00
coroutine-win32.c coroutine-win32.c: Add noinline attribute to work around gcc bug 2014-06-26 14:08:14 +01:00
cpu-exec-common.c cpu-exec: Migrate some generic fns to cpu-exec-common 2015-09-16 17:33:33 +02:00
cpu-exec.c cpu-exec: Migrate some generic fns to cpu-exec-common 2015-09-16 17:33:33 +02:00
cpus.c cpus: remove tcg_halt_cond and tcg_cpu_thread globals 2015-09-09 15:34:55 +02:00
cputlb.c cputlb: Change tlb_set_dirty() arg to cpu 2015-09-16 17:33:33 +02:00
device_tree.c device_tree: Fix a typo 2015-07-27 22:44:47 +03:00
device-hotplug.c pci-hotplug-old: Has been dead for five major releases, bury 2015-03-01 12:37:54 +01:00
disas.c disas: Defeature print_target_address 2015-08-14 23:40:32 +02:00
dma-helpers.c range: remove useless inclusions 2015-04-30 16:05:48 +03:00
dump.c Include qapi/qmp/qerror.h exactly where needed 2015-06-22 18:20:41 +02:00
exec.c include/exec: Move cputlb exec.c defs out 2015-09-16 17:33:33 +02:00
gdbstub.c * Support for jemalloc 2015-09-14 16:13:16 +01:00
HACKING HACKING: Document vaddr type usage 2013-07-23 02:41:31 +02:00
hmp-commands-info.hx hmp: Restore "info pci" 2015-09-22 11:32:37 +02:00
hmp-commands.hx monitor: allow device_del to accept QOM paths 2015-09-22 11:31:56 +02:00
hmp.c hmp: add info iothreads command 2015-09-04 13:26:26 +02:00
hmp.h hmp: add info iothreads command 2015-09-04 13:26:26 +02:00
iohandler.c iohandler: Use aio API 2015-09-07 18:14:03 +02:00
ioport.c - miscellaneous cleanups for TCG (Emilio) and NBD (Bogdan) 2015-04-30 12:04:11 +01:00
iothread.c rcu: actually register threads that have RCU read-side critical sections 2015-07-24 13:57:45 +02:00
kvm-all.c intc/gic: Extract some reusable vGIC code 2015-09-24 01:29:36 +01:00
kvm-stub.c kvm: some fixes to kvm_resamplefds_allowed 2015-07-06 12:15:14 -06:00
LICENSE vfio: move hw/misc/vfio.c to hw/vfio/pci.c Move vfio.h into include/hw/vfio 2014-12-19 15:24:06 -07:00
main-loop.c iohandler: Use aio API 2015-09-07 18:14:03 +02:00
MAINTAINERS MAINTAINERS: update Allwinner A10 maintainer 2015-09-24 01:29:37 +01:00
Makefile nsis: Add QEMU version information to Windows registry 2015-09-24 20:52:28 +02:00
Makefile.objs libcacard: use the standalone project 2015-09-23 23:34:17 +02:00
Makefile.target * Linux header update and cleanup 2015-09-16 18:06:54 +01:00
memory_mapping.c memory_mapping: Rework cpu related includes 2015-06-26 16:00:50 +02:00
memory.c memory: Fix bad error handling in memory_region_init_ram_ptr() 2015-09-18 14:39:39 +02:00
module-common.c module: implement module loading 2014-02-20 13:14:18 +01:00
monitor.c qapi: New QMP command query-qmp-schema for QMP introspection 2015-09-21 09:56:49 +02:00
nbd.c nbd: release exp->blk after all clients are closed 2015-09-16 17:33:33 +02:00
numa.c Fix bad error handling after memory_region_init_ram() 2015-09-18 14:39:29 +02:00
os-posix.c rcu: do not create thread in pthread_atfork callback 2015-04-01 10:06:38 +02:00
os-win32.c maint: remove unused include for signal.h 2015-09-11 10:21:38 +03:00
page_cache.c maint: remove unused include for strings.h 2015-09-11 10:21:38 +03:00
qapi-schema.json monitor: allow device_del to accept QOM paths 2015-09-22 11:31:56 +02:00
qdev-monitor.c monitor: allow device_del to accept QOM paths 2015-09-22 11:31:56 +02:00
qdict-test-data.txt
qemu-bridge-helper.c qemu-bridge-helper: Fix fd leak in main() 2014-06-27 10:39:10 +02:00
qemu-char.c qemu-char: Use g_new() & friends where that makes obvious sense 2015-09-16 17:33:33 +02:00
qemu-coroutine-io.c coroutine-io: Return -errno in case of error 2015-03-18 12:07:21 +01:00
qemu-coroutine-lock.c coroutine: remove unnecessary parentheses in qemu_co_queue_empty 2015-04-30 16:05:49 +03:00
qemu-coroutine-sleep.c coroutine: Drop co_sleep_ns 2014-08-29 10:46:58 +01:00
qemu-coroutine.c coroutine: Clean up qemu_coroutine_enter() 2015-03-09 11:11:59 +01:00
qemu-doc.texi monitor: added generation of documentation for hmp-commands-info.hx 2015-09-16 17:33:33 +02:00
qemu-ga.texi qga: start a man page 2015-09-01 13:16:26 -05:00
qemu-img-cmds.hx qemu-img: Add progress output for amend 2014-11-03 11:41:48 +00:00
qemu-img.c qemu-img: Fix crash in amend invocation 2015-09-04 20:59:48 +02:00
qemu-img.texi maint: remove / fix many doubled words 2015-09-11 10:21:38 +03:00
qemu-io-cmds.c qemu-io: Add command 'reopen' 2015-09-14 16:51:36 +02:00
qemu-io.c qemu-io: Remove duplicate 'open' error message 2015-09-14 16:51:36 +02:00
qemu-log.c qemu-log: Correct help text of 'log cpu_reset' 2015-02-10 09:27:20 +03:00
qemu-nbd.c Trivial: fix commandline help message 2015-09-11 10:21:38 +03:00
qemu-nbd.texi nbd: Miscellaneous typo fixes. 2014-05-24 00:07:29 +04:00
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 ui: convert VNC server to use QCryptoTLSSession 2015-09-15 15:20:55 +01:00
qemu-seccomp.c seccomp: add mlockall to whitelist 2015-01-23 14:07:08 +01:00
qemu-tech.texi qemu-doc: fix typos 2015-07-24 13:57:45 +02:00
qemu-timer.c qemu-timer: initialize "timers_done_ev" to set 2015-07-22 12:41:32 +01:00
qemu.nsi nsis: Add QEMU version information to Windows registry 2015-09-24 20:52:28 +02:00
qemu.sasl sasl: Avoid 'Could not find keytab file' in syslog 2014-03-15 13:54:18 +04:00
qjson.c QJSON: Use OBJECT_CHECK 2015-05-11 08:59:07 -04:00
qmp-commands.hx monitor: allow device_del to accept QOM paths 2015-09-22 11:31:56 +02:00
qmp.c qom: Don't use 'gen': false for qom-get, qom-set, object-add 2015-09-21 09:56:49 +02:00
qtest.c qtest: pre-buffer hex nibs 2015-05-22 15:58:22 -04:00
README Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
rules.mak make: load only required dependency files. 2015-08-13 14:08:25 +03:00
softmmu_template.h softmmu: remove now unused functions 2015-09-11 08:16:05 -07:00
spice-qemu-char.c spice: fix spice_chr_add_watch() pre-condition 2015-05-29 09:56:01 +02:00
tcg-runtime.c tcg: Push tcg-runtime routines into exec/helper-* 2014-05-28 09:33:54 -07:00
tci.c tcg: Move tci_tb_ptr to -common 2015-09-16 17:33:33 +02:00
thread-pool.c thread-pool: clean up thread_pool_completion_bh() 2015-04-28 15:36:09 +02:00
thunk.c linux-user: Allocate thunk size dynamically 2015-06-15 11:36:58 +03:00
tpm.c Include monitor/monitor.h exactly where needed 2015-06-22 18:20:41 +02:00
trace-events vfio/pci: Add emulated PCI IDs 2015-09-23 13:04:49 -06:00
translate-all.c translate: move real_host_page setting to -common 2015-09-16 17:33:33 +02:00
translate-all.h translate-all: remove unnecessary argument to tb_invalidate_phys_range 2015-06-05 17:09:59 +02:00
translate-common.c translate: move real_host_page setting to -common 2015-09-16 17:33:33 +02:00
user-exec.c osdep.h: Remove qemu_printf 2015-08-19 16:29:53 +01:00
VERSION Open 2.5 development tree 2015-08-11 23:15:55 +01:00
version.rc Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
vl.c machine: Eliminate QEMUMachine and qemu_register_machine() 2015-09-19 16:40:30 +02:00
xen-common-stub.c accel: Move Xen registration code to xen-common.c 2014-10-04 08:59:15 +02:00
xen-common.c migration: Fix regression for xenfv and pc,accel=xen machine. 2015-08-03 16:13:40 +00:00
xen-hvm-stub.c pc: Remove redundant arguments from xen_hvm_init() 2015-09-10 11:05:40 +03:00
xen-hvm.c Fix bad error handling after memory_region_init_ram() 2015-09-18 14:39:29 +02:00
xen-mapcache.c maint: avoid useless "if (foo) free(foo)" pattern 2015-09-11 10:21:38 +03:00

README 

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

- QEMU team