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Fam Zheng de50a20a4c block: Switch to host monotonic clock for IO throttling 
Currently, throttle timers won't make any progress when VCPU is not
running, which would stall the request queue in utils, qtest, vm
suspending, and live migration, without special handling.

Block jobs are confusingly inconsistent between with and without
throttling: if user sets a bps limit, stops the vm, then start a block
job, the block job will not make any progress; in contrary, if user
unsets the bps limit, or if it's not set, the block job will run
normally.

After this patch, with the host clock, even if the VCPUs are stopped,
the throttle queues will be processed.

This patch also enables potential to add throttle to bdrv_drain_all.
Currently all requests are drained immediately. In other words whenever
it is called, IO throttling goes ineffective (examples: system reset,
migration and many block job operations.). This is a loophole that guest
could exploit. If we use the host clock, we can later just trust the
nested poll. This could be done on top.

Note that for qemu-iotests case 093, which uses qtest, we still keep vm
clock so the script can control the clock stepping in order to be
deterministic.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 1427268446-6426-1-git-send-email-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
 		2015-04-28 15:36:08 +02:00
audio audio: Don't free hw resources until after hw backend is stopped 2014-12-22 23:12:25 +00:00
backends hostmem: Prevent removing an in-use memory backend 2015-04-01 10:06:38 +02:00
block Convert (ffs(val) - 1) to ctz32(val) 2015-04-28 15:36:08 +02:00
bsd-user cpu: Make cpu_init() return QOM CPUState object 2015-03-10 17:33:51 +01:00
default-configs hw/usb: Include USB files only if necessary 2015-03-18 11:50:47 +01:00
disas cris: remove unused cris_cond15 declarations 2015-03-19 11:11:55 +03:00
docs fw_cfg: add documentation file (docs/specs/fw_cfg.txt) 2015-04-14 13:21:08 +02:00
dtc@bc895d6d09 dtc: add submodule 2013-04-18 13:50:53 +02:00
fpu softfloat: expand out STATUS macro 2015-02-06 16:11:38 +00:00
fsdev Fix typos in comments 2015-03-19 11:30:37 +03:00
gdb-xml s390x/gdb: add the feature xml files for s390x 2014-09-01 09:45:19 +02:00
hw omap_intc: convert ffs(3) to ctz32() in omap_inth_sir_update() 2015-04-28 15:36:08 +02:00
include os-win32: drop ffs(3) prototype 2015-04-28 15:36:08 +02:00
libcacard libcacard: stop linking against every single 3rd party library 2015-02-10 09:27:20 +03:00
libdecnumber libdecnumber: Fix warnings from smatch (missing static, boolean operations) 2014-08-24 13:21:06 +04:00
linux-headers synchronize Linux headers to 4.0-rc3 2015-03-10 09:26:22 +01:00
linux-user rcu: do not create thread in pthread_atfork callback 2015-04-01 10:06:38 +02:00
migration rdma: Fix cleanup in error paths 2015-03-26 15:31:46 +01:00
net net: synchronize net_host_device_remove with host_net_remove_completion 2015-03-12 19:59:39 +00:00
pc-bios pseries: Update SLOF firmware image to qemu-slof-20150313 2015-03-25 22:49:45 +01:00
pixman@87eea99e44 pixman: update internal copy to pixman-0.32.6 2014-09-15 08:14:19 +02:00
po po: fix conflict with %.mo rule in rules.mak 2014-09-26 13:35:08 +02:00
qapi block: Document blockdev-add's immaturity 2015-03-27 10:01:12 +00:00
qga qga: fitering out -fstack-protector-strong 2015-04-02 15:57:27 +02:00
qobject qjson: Drop trailing space for pretty formatting 2014-12-10 10:25:30 +01:00
qom qom: Add can_be_deleted callback to UserCreatableClass 2015-04-01 10:06:38 +02:00
roms pseries: Update SLOF firmware image to qemu-slof-20150313 2015-03-25 22:49:45 +01:00
scripts checkpatch: complain about ffs(3) calls 2015-04-28 15:36:08 +02:00
slirp slirp: udp: fix NULL pointer dereference because of uninitialized socket 2014-09-23 19:15:05 +01:00
stubs pci, pc, virtio fixes and cleanups 2015-03-09 09:14:28 +00:00
sysconfigs/target Eliminate cpus-x86_64.conf file 2012-09-21 15:12:58 +02:00
target-alpha tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-arm Allow ARMv8 SCR.SMD updates 2015-04-26 16:49:26 +01:00
target-cris cris: remove unused cris_cond15 declarations 2015-03-19 11:11:55 +03:00
target-i386 X86 queue, 2015-04-27 (v2) 2015-04-28 12:22:20 +01:00
target-lm32 tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-m68k tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-microblaze tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-mips trivial patches for 2015-03-19 2015-03-19 14:10:20 +00:00
target-moxie target-moxie: Fix warnings from Sparse (one-bit signed bitfield) 2015-03-19 11:11:55 +03:00
target-openrisc tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-ppc Convert (ffs(val) - 1) to ctz32(val) 2015-04-28 15:36:08 +02:00
target-s390x Final batch of s390x enhancements/fixes for 2.3: 2015-03-16 11:44:55 +00:00
target-sh4 tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-sparc tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-tricore target-tricore: Fix check which was always false 2015-04-04 09:45:59 +03:00
target-unicore32 tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-xtensa tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
tcg tcg/tcg-op.c: Fix ld/st of 64 bit values on 32-bit bigendian hosts 2015-04-09 10:51:10 +01:00
tests qcow2: Fix header update with overridden backing file 2015-04-08 10:29:20 +01:00
trace Remove superfluous '\n' around error_report() 2015-03-10 08:15:33 +03:00
ui spice: misc fixes. 2015-04-27 20:00:57 +01:00
util qemu-config: Accept empty option values 2015-04-27 15:38:13 -03:00
.exrc qemu: add .exrc 2012-09-07 09:02:44 +03:00
.gitignore gitignore: Ignore more .pod files. 2015-04-04 09:45:59 +03:00
.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
CODING_STYLE CODING_STYLE: Section about conditional statement 2014-08-15 18:54:06 +04:00
COPYING COPYING: update from FSF 2008-10-12 17:54:42 +00:00
COPYING.LIB Update FSF address in GPL/LGPL boilerplate 2009-01-04 22:05:52 +00:00
Changelog Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
HACKING HACKING: Document vaddr type usage 2013-07-23 02:41:31 +02:00
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
MAINTAINERS MAINTAINERS: Add myself as the maintainer of the Quorum driver 2015-04-28 15:36:08 +02:00
Makefile Use $(MAKE) for recursive make 2015-04-02 15:58:39 +02:00
Makefile.objs QJSON: Add JSON writer 2015-02-05 17:16:14 +01:00
Makefile.target Makefile.target: binary depends on config-devices 2015-03-01 19:41:50 +01:00
README Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
VERSION Open 2.4 development tree 2015-04-25 22:05:07 +01:00
accel.c accel: Create accel object when initializing machine 2014-10-09 15:36:14 +02:00
aio-posix.c block: Use g_new0() for a bit of extra type checking 2014-12-10 10:31:21 +01:00
aio-win32.c block: Use g_new0() for a bit of extra type checking 2014-12-10 10:31:21 +01:00
arch_init.c migration: remove last_sent_block from save_page_header 2015-03-26 15:31:46 +01:00
async.c aio: strengthen memory barriers for bottom half scheduling 2015-04-09 10:29:29 +01:00
balloon.c balloon: improve error msg when adding second device 2015-04-24 14:18:05 -04:00
block.c block: Switch to host monotonic clock for IO throttling 2015-04-28 15:36:08 +02:00
blockdev-nbd.c nbd: Fix up comment after commit e140177 2015-03-25 13:38:07 +01:00
blockdev.c block: Fix blockdev-backup not to use funky error class 2015-03-19 16:02:59 +01:00
blockjob.c block: declare blockjobs and dataplane friends! 2014-11-03 11:41:49 +00:00
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
configure Revert seccomp tests that allow it to be used on non-x86 architectures 2015-04-13 12:28:48 +01:00
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.c - vhost-scsi: add bootindex property 2015-02-24 13:58:18 +00:00
cpus.c cpus: Don't kick un-realized cpus. 2015-03-25 13:38:07 +01:00
cputlb.c Add MemTxAttrs to the IOTLB 2015-04-26 16:49:24 +01:00
device-hotplug.c pci-hotplug-old: Has been dead for five major releases, bury 2015-03-01 12:37:54 +01:00
device_tree.c machine: query phandle-start machine property 2015-03-11 18:17:11 +01:00
disas.c monitor: QEMU Monitor Instruction Disassembly Incorrect for PowerPC LE Mode 2014-06-16 13:24:26 +02:00
dma-helpers.c exec.c: Make address_space_rw take transaction attributes 2015-04-26 16:49:24 +01:00
dump.c dump: Fix dump-guest-memory termination and use-after-close 2014-11-02 10:04:34 +03:00
exec.c exec.c: Capture the memory attributes for a watchpoint hit 2015-04-26 16:49:24 +01:00
gdbstub.c gdbstub: avoid possible NULL pointer dereference 2015-03-10 08:15:34 +03:00
hmp-commands.hx monitor: Make client_migrate_info synchronous 2015-04-27 12:46:57 +02:00
hmp.c hmp: fix crash in 'info block -n -v' 2015-04-17 14:27:42 +01:00
hmp.h qom: Implement qom-set HMP command 2015-03-17 14:31:15 +01:00
iohandler.c iohandler.c: Properly initialize sigaction struct 2014-05-24 00:07:29 +04:00
ioport.c exec.c: Make address_space_rw take transaction attributes 2015-04-26 16:49:24 +01:00
iothread.c async: aio_context_new(): Handle event_notifier_init failure 2014-09-22 11:39:48 +01:00
kvm-all.c Convert ffs() != 0 callers to ctz32() 2015-04-28 15:36:08 +02:00
kvm-stub.c pc: kvm: check if KVM has free memory slots to avoid abort() 2014-11-23 12:11:29 +02:00
main-loop.c Revert "main-loop.c: Handle SIGINT, SIGHUP and SIGTERM synchronously" 2014-10-27 15:05:09 +00:00
memory.c memory: Replace io_mem_read/write with memory_region_dispatch_read/write 2015-04-26 16:49:23 +01:00
memory_mapping.c Add skip_dump flag to ignore memory region during dump 2014-10-31 11:29:01 +01:00
module-common.c module: implement module loading 2014-02-20 13:14:18 +01:00
monitor.c target-arm queue: 2015-04-28 10:31:03 +01:00
nbd.c nbd: Drop unexpected data for NBD_OPT_LIST 2015-03-18 12:07:16 +01:00
numa.c numa: Print warning if no node is assigned to a CPU 2015-03-19 16:20:15 -03:00
os-posix.c rcu: do not create thread in pthread_atfork callback 2015-04-01 10:06:38 +02:00
os-win32.c pidfile: stop making pidfile error a special case 2014-11-02 10:04:34 +03:00
page_cache.c xbzrle: rebuild the cache_is_cached function 2015-01-15 17:49:43 +05:30
qapi-schema.json migration: Convert 'status' of MigrationInfo to use an enum type 2015-03-17 15:20:37 +01:00
qdev-monitor.c qom: Implement info qom-tree HMP command 2015-03-17 14:31:21 +01:00
qdict-test-data.txt Introduce QDict test data file 2009-09-04 09:37:34 -05:00
qemu-bridge-helper.c qemu-bridge-helper: Fix fd leak in main() 2014-06-27 10:39:10 +02:00
qemu-char.c qemu-img: Suppress unhelpful extra errors in convert, amend 2015-02-26 14:51:21 +01:00
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 qemu_co_queue_wait_insert_head 2013-12-02 17:11:49 +01:00
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 raw-posix: Deprecate host floppy passthrough 2015-03-19 11:43:02 +01:00
qemu-img-cmds.hx qemu-img: Add progress output for amend 2014-11-03 11:41:48 +00:00
qemu-img.c qemu-img: Avoid qerror_report_err() outside QMP handlers, again 2015-03-16 17:07:25 +01:00
qemu-img.texi qemu-img: Add progress output for amend 2014-11-03 11:41:48 +00:00
qemu-io-cmds.c qemu-io: Use BlockBackend 2015-02-16 15:07:19 +00:00
qemu-io.c Clean up around error_get_pretty(), qerror_report_err() 2015-02-26 07:01:08 +00:00
qemu-log.c qemu-log: Correct help text of 'log cpu_reset' 2015-02-10 09:27:20 +03:00
qemu-nbd.c nbd: Set block size to BDRV_SECTOR_SIZE 2015-03-18 12:07:01 +01:00
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 Block patches for 2.3.0-rc1 2015-03-19 17:47:08 +00:00
qemu-seccomp.c seccomp: add mlockall to whitelist 2015-01-23 14:07:08 +01:00
qemu-tech.texi qemu-tech.texi: update implemented xtensa features list 2012-11-29 13:00:52 -06:00
qemu-timer.c qemu-timer.c: Trim list of included headers 2015-01-26 18:15:54 +00:00
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
qjson.c QJSON: fix typo in author's email address 2015-02-10 09:27:20 +03:00
qmp-commands.hx spice: misc fixes. 2015-04-27 20:00:57 +01:00
qmp.c qom: Add can_be_deleted callback to UserCreatableClass 2015-04-01 10:06:38 +02:00
qtest.c qtest: Use qemu_opt_set() instead of qemu_opts_parse() 2015-02-26 14:52:13 +01:00
rules.mak rules.mak: Fix module build 2015-01-14 10:38:57 +01:00
savevm.c error: Replace error_report() & error_free() with error_report_err() 2015-03-19 11:11:55 +03:00
softmmu_template.h Add MemTxAttrs to the IOTLB 2015-04-26 16:49:24 +01:00
spice-qemu-char.c spice: Add missing 'static' attribute 2015-02-10 10:26:05 +03:00
tcg-runtime.c tcg: Push tcg-runtime routines into exec/helper-* 2014-05-28 09:33:54 -07:00
tci.c tcg: Remove unused opcodes 2015-02-12 21:21:38 -08:00
thread-pool.c block: Rename BlockDriverCompletionFunc to BlockCompletionFunc 2014-10-20 13:41:27 +02:00
thunk.c exec: move include files to include/exec/ 2012-12-19 08:31:31 +01:00
tpm.c tpm: Remove superfluous '\n' around error_report() 2015-03-10 08:15:33 +03:00
trace-events s390x/kvm: trace all SIGP orders 2015-03-10 09:26:22 +01:00
translate-all.c target-i386: remove superfluous TARGET_HAS_SMC macro 2015-04-04 09:45:59 +03:00
translate-all.h translate-all: Change tb_check_watchpoint() argument to CPUState 2014-03-13 19:20:48 +01:00
user-exec.c user-exec.c: fix build on NetBSD/sparc64 and NetBSD/arm 2015-03-13 15:57:00 +00:00
version.rc Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
vl.c Avoid crashing on multiple -incoming 2015-03-26 15:31:46 +01:00
xen-common-stub.c accel: Move Xen registration code to xen-common.c 2014-10-04 08:59:15 +02:00
xen-common.c accel: Pass MachineState object to accel init functions 2014-10-09 12:57:10 +02:00
xen-hvm-stub.c xen: Remove xen_cmos_set_s3_resume() 2015-03-10 08:15:33 +03:00
xen-hvm.c Xen: Use the ioreq-server API when available 2015-01-20 14:24:10 +00:00
xen-mapcache.c xen: add a lock for the mapcache 2015-01-20 14:24:17 +00:00

README 

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

- QEMU team