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qemu/util
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Paolo Bonzini 993ed89f35 aio-posix: ensure poll mode is left when aio_notify is called 
With aio=thread, adaptive polling makes latency worse rather than
better, because it delays the execution of the ThreadPool's
completion bottom half.

event_notifier_poll() does run while polling, detecting that
a bottom half was scheduled by a worker thread, but because
ctx->notifier is explicitly ignored in run_poll_handlers_once(),
scheduling the BH does not count as making progress and
run_poll_handlers() keeps running.  Fix this by recomputing
the deadline after *timeout could have changed.

With this change, ThreadPool still cannot participate in polling
but at least it does not suffer from extra latency.

Reported-by: Sergio Lopez <slp@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20190409122823.12416-1-pbonzini@redhat.com
Cc: Stefan Hajnoczi <stefanha@gmail.com>
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-block@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1553692145-86728-1-git-send-email-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20190409122823.12416-1-pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2019-05-10 10:53:21 +01:00
..
aio-posix.c aio-posix: ensure poll mode is left when aio_notify is called 2019-05-10 10:53:21 +01:00
aio-wait.c block: Use a single global AioWait 2018-09-25 15:50:15 +02:00
aio-win32.c aio-posix: Fix concurrent aio_poll/set_fd_handler. 2019-01-14 14:09:41 +00:00
aiocb.c block: move AioContext, QEMUTimer, main-loop to libqemuutil 2017-02-21 11:14:07 +00:00
async.c util/async: use qemu_aio_coroutine_enter in co_schedule_bh_cb 2018-09-25 15:50:15 +02:00
atomic64.c util: add atomic64 2018-10-02 18:47:55 +02:00
base64.c
bitmap.c bitmap: provide to_le/from_le helpers 2017-09-22 14:11:25 +02:00
bitops.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
buffer.c
bufferiszero.c util: Introduce include/qemu/cpuid.h 2017-07-24 12:42:55 +01:00
cacheinfo.c util/cacheinfo: Use uint64_t on LLP64 model to satisfy Windows ARM64 2019-05-07 12:55:03 +01:00
compatfd.c cpus: remove ugly cast on sigbus_handler 2017-03-03 16:40:02 +01:00
coroutine-sigaltstack.c coroutine-sigaltstack: use helper for allocating stack memory 2016-09-29 14:13:39 +02:00
coroutine-ucontext.c build: try improve handling of clang warnings 2018-03-12 08:59:03 +01:00
coroutine-win32.c coroutine: add a macro for the coroutine stack size 2016-09-29 14:13:39 +02:00
crc32c.c
cutils.c cutils: Fix size_to_str() on 32-bit platforms 2019-04-30 15:29:00 +02:00
drm.c util: promote qemu_egl_rendernode_open() to libqemuutil 2018-08-27 10:51:44 +02:00
envlist.c util: Use g_malloc/g_free in envlist.c 2017-05-07 09:57:51 +03:00
error.c util/error: do not free error on error_abort 2019-04-17 19:15:39 +02:00
event_notifier-posix.c Revert "qemu: add a cleanup callback function to EventNotifier" 2018-01-24 19:20:19 +02:00
event_notifier-win32.c Revert "qemu: add a cleanup callback function to EventNotifier" 2018-01-24 19:20:19 +02:00
fifo8.c migration: consolidate VMStateField.start 2017-02-13 17:27:13 +00:00
filemonitor-inotify.c filemon: fix watch IDs to avoid potential wraparound issues 2019-04-02 13:52:02 +01:00
filemonitor-stub.c filemon: fix watch IDs to avoid potential wraparound issues 2019-04-02 13:52:02 +01:00
getauxval.c
hbitmap.c Revert "hbitmap: Add @advance param to hbitmap_iter_next()" 2019-01-15 18:26:50 -05:00
hexdump.c
host-utils.c host-utils: Implement unsigned quadword left/right shift and unit tests 2017-01-31 10:10:14 +11:00
id.c
iohandler.c block: move AioContext, QEMUTimer, main-loop to libqemuutil 2017-02-21 11:14:07 +00:00
iov.c util: Fix assertion in iov_copy() upon zero 'bytes' and non-zero 'offset' 2016-08-03 18:44:57 +02:00
iova-tree.c util: remove redundant include of glib.h and add osdep.h 2018-06-29 12:22:28 +01:00
keyval.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
lockcnt.c qemu-thread: optimize QemuLockCnt with futexes on Linux 2017-01-16 13:25:18 +00:00
log.c tcg: Optionally log FPU state in TCG -d cpu logging 2018-05-15 14:58:44 +01:00
main-loop.c slirp: move sources to src/ subdirectory 2019-03-07 12:46:31 +01:00
Makefile.objs qemu-print: New qemu_printf(), qemu_vprintf() etc. 2019-04-18 22:18:59 +02:00
memfd.c memfd: improve error messages 2019-03-11 17:17:01 -03:00
mmap-alloc.c util/mmap-alloc: support MAP_SYNC in qemu_ram_mmap() 2019-04-25 14:17:36 -03:00
module.c module: Use QEMU_MODULE_DIR as a search path 2018-08-23 18:46:25 +02:00
notify.c
osdep.c slirp: prefer c99 types over BSD kind 2019-02-07 15:49:08 +02:00
oslib-posix.c util/mmap-alloc: Add a 'is_pmem' parameter to qemu_ram_mmap 2019-04-25 14:17:36 -03:00
oslib-win32.c hostmem-file: reject invalid pmem file sizes 2019-03-11 10:44:19 -03:00
pagesize.c util: move qemu_real_host_page_size/mask to osdep.h 2017-10-10 09:45:00 -07:00
path.c util: Removed unneeded header from path.c 2017-03-14 13:26:37 +01:00
qdist.c qdist: return "(empty)" instead of NULL when printing an empty dist 2016-08-03 18:44:56 +02:00
qemu-config.c block: Add block-specific QDict header 2018-06-15 14:49:44 +02:00
qemu-coroutine-io.c
qemu-coroutine-lock.c coroutine: avoid co_queue_wakeup recursion 2018-03-27 13:05:28 +01:00
qemu-coroutine-sleep.c qemu-coroutine-sleep: drop CoSleepCB 2019-01-24 10:05:16 +00:00
qemu-coroutine.c block: Add missing locking in bdrv_co_drain_bh_cb() 2018-09-25 15:50:15 +02:00
qemu-error.c monitor error: Make printf()-like functions return a value 2019-04-18 22:18:59 +02:00
qemu-openpty.c
qemu-option.c qemu/queue.h: simplify reverse access to QTAILQ 2019-01-11 15:46:55 +01:00
qemu-print.c qemu-print: New qemu_fprintf(), qemu_vfprintf() 2019-04-18 22:18:59 +02:00
qemu-progress.c progress: Show current progress on SIGINFO 2017-04-28 18:48:11 +02:00
qemu-sockets.c sockets: avoid string truncation warnings when copying UNIX path 2019-05-03 13:03:04 +02:00
qemu-thread-common.h Clean up includes 2018-12-20 10:29:08 +01:00
qemu-thread-posix.c qemu-thread: Don't block SEGV, ILL and FPE 2019-01-08 12:34:46 +00:00
qemu-thread-win32.c build-sys: build with Vista API by default 2019-01-11 13:57:25 +01:00
qemu-timer-common.c
qemu-timer.c qemu-timer: avoid checkpoints for virtual clock timers in external subsystems 2018-10-19 13:44:03 +02:00
qht.c qht: constify arguments to some internal functions 2018-09-26 08:55:54 -07:00
qsp.c qsp: Simplify how qsp_report() prints 2019-04-18 22:18:59 +02:00
range.c Don't talk about the LGPL if the file is licensed under the GPL 2019-01-30 10:51:20 +01:00
rcu.c membarrier: introduce qemu/sys_membarrier.h 2018-03-12 16:12:47 +01:00
readline.c util/readline: Add braces to fix checkpatch errors 2019-05-10 10:53:21 +01:00
stats64.c util/stats64: Fix min/max comparisons 2017-11-15 09:34:51 +01:00
sys_membarrier.c sys_membarrier: fix up include directives 2018-04-05 14:37:38 +02:00
systemd.c qemu-ga: obey LISTEN_PID when using systemd socket activation 2017-03-19 11:12:12 +01:00
thread-pool.c thread-pool: add missing qemu_bh_cancel in completion function 2017-03-17 12:54:21 +01:00
throttle.c throttle: Assert that bkt->max is valid in throttle_compute_wait() 2017-09-26 14:46:23 +02:00
timed-average.c
trace-events filemon: fix watch IDs to avoid potential wraparound issues 2019-04-02 13:52:02 +01:00
unicode.c json: Reject invalid UTF-8 sequences 2018-08-24 20:26:37 +02:00
uri.c cutils: Provide strchrnul 2018-06-29 12:32:10 +02:00
uuid.c uuid: Make qemu_uuid_bswap() take and return a QemuUUID 2019-02-01 13:46:45 +01:00
vfio-helpers.c exec: Change RAMBlockIterFunc definition 2019-03-06 10:49:17 +00:00