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qemu-cr16/util
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Stefan Hajnoczi 511c62a2c6 aio-posix: keep polling enabled with fdmon-io_uring.c 
Commit 816a430c51 ("util/aio: Defer disabling poll mode as long as
possible") kept polling enabled when the event loop timeout is 0. Since
there is no timeout the event loop will continue immediately and the
overhead of disabling and re-enabling polling can be avoided.

fdmon-io_uring.c is unable to take advantage of this optimization
because its ->need_wait() function returns true whenever there are new
io_uring SQEs to submit:

  if (timeout || ctx->fdmon_ops->need_wait(ctx)) {
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Polling will be disabled even when timeout == 0.

Extend the optimization to handle the case when need_wait() returns true
and timeout == 0.

Cc: Chao Gao <chao.gao@intel.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20251104022933.618123-5-stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2025-11-11 17:32:48 +01:00
..
aio-posix.c aio-posix: keep polling enabled with fdmon-io_uring.c 2025-11-11 17:32:48 +01:00
aio-posix.h aio-posix: Separate AioPolledEvent per AioHandler 2025-03-13 17:57:23 +01:00
aio-wait.c aio-wait: avoid AioContext lock in aio_wait_bh_oneshot() 2023-05-10 14:15:13 +02:00
aio-win32.c error: Kill @error_warn 2025-10-01 08:33:24 +02:00
aiocb.c
async.c async: access bottom half flags with qatomic_read 2025-10-14 11:03:59 +02:00
atomic64.c
base64.c
bitmap.c migration: Use non-atomic ops for clear log bitmap 2022-11-21 11:58:10 +01:00
bitops.c replace TABs with spaces 2023-03-20 12:43:50 +01:00
block-helpers.c block: Adjust check_block_size() signature 2024-10-18 15:03:35 +02:00
block-helpers.h block: Adjust check_block_size() signature 2024-10-18 15:03:35 +02:00
buffer.c
bufferiszero.c util/bufferiszero: Split out host include files 2024-06-19 12:47:11 -07:00
cacheflush.c buildsys: Remove support for 32-bit PPC hosts 2025-10-16 14:58:53 -07:00
chardev_open.c util/char_dev: Add open_cdev() 2023-12-19 19:03:38 +01:00
compatfd.c
coroutine-sigaltstack.c osdep: set _FORTIFY_SOURCE=2 when optimization is enabled 2023-10-04 09:52:06 -04:00
coroutine-ucontext.c coroutine-ucontext: Save fake stack for pooled coroutine 2024-01-22 11:00:12 -05:00
coroutine-wasm.c util: Add coroutine backend for emscripten 2025-05-06 16:02:04 +02:00
coroutine-windows.c build: move coroutine backend selection to meson 2023-05-18 08:53:52 +02:00
cpuinfo-aarch64.c util/cpuinfo: Make use of elf_aux_info(3) on OpenBSD 2024-07-30 07:59:23 +10:00
cpuinfo-i386.c cpuinfo/i386: Detect GFNI as an AVX extension 2025-09-04 09:49:23 +02:00
cpuinfo-loongarch.c util/loongarch64: Detect LASX vector support 2024-06-19 10:55:12 -07:00
cpuinfo-ppc.c util/cpuinfo: Make use of elf_aux_info(3) on OpenBSD 2024-07-30 07:59:23 +10:00
cpuinfo-riscv.c util/cpuinfo-riscv: Detect Zbs 2025-01-16 20:57:17 -08:00
crc-ccitt.c
crc32c.c igb: Implement Rx SCTP CSO 2023-05-23 15:20:15 +08:00
cutils.c util/cutils: Remove unused qemu_get_exec_dir 2024-09-20 10:04:34 +03:00
dbus.c
defer-call.c util/defer-call: move defer_call() to util/ 2023-10-31 15:41:42 +01:00
drm.c
envlist.c envlist: Remove unused envlist_parse 2024-09-20 10:00:27 +03:00
error-report.c Remove glib compatibility code that is not required anymore 2024-05-14 12:46:39 +02:00
error.c error: Kill @error_warn 2025-10-01 08:33:24 +02:00
event.c qemu-thread: Use futex for QemuEvent on Windows 2025-06-06 14:32:55 +02:00
event_notifier-posix.c treewide: use qemu_set_blocking instead of g_unix_set_fd_nonblocking 2025-09-19 12:46:07 +01:00
event_notifier-win32.c
fdmon-epoll.c include: Move QemuLockCnt APIs to their own header 2024-10-15 15:16:17 +01:00
fdmon-io_uring.c aio-posix: fix spurious return from ->wait() due to signals 2025-11-11 17:32:48 +01:00
fdmon-poll.c aio: remove aio_disable_external() API 2023-05-30 17:37:26 +02:00
fifo8.c fifo8: introduce fifo8_peek() function 2024-09-13 20:11:13 +02:00
filemonitor-inotify.c util/filemonitor-inotify.c: spelling fix: kenel 2023-11-15 12:06:05 +03:00
filemonitor-stub.c
getauxval.c util/cpuinfo: Make use of elf_aux_info(3) on OpenBSD 2024-07-30 07:59:23 +10:00
guest-random.c util/guest-random: Clean up global variable shadowing 2023-10-06 13:27:48 +02:00
hbitmap.c qapi/crypto: Rename QCryptoHashAlgorithm to *Algo, and drop prefix 2024-09-10 14:02:16 +02:00
hexdump.c util/hexdump: fix QEMU_HEXDUMP_LINE_WIDTH logic 2025-11-03 11:59:32 +01:00
host-utils.c host-utils: Implemented signed 256-by-128 division 2022-06-20 08:38:58 -03:00
id.c
int128.c include/qemu/int128: Use Int128 structure for TCI 2023-02-04 06:19:42 -10:00
interval-tree.c util/interval-tree: Check root for null in interval_tree_iter_first 2023-08-09 09:26:32 -07:00
iov.c util/iov: Do not assert offset is in iov 2025-03-10 17:07:16 +08:00
iova-tree.c vhost-iova-tree, svq: Implement GPA->IOVA & partial IOVA->HVA trees 2025-02-21 07:18:42 -05:00
keyval.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +01:00
lockcnt.c qemu-thread: Use futex if available for QemuLockCnt 2025-06-06 14:32:55 +02:00
log.c log: change qemu_loglevel to unsigned 2025-10-01 11:22:07 -04:00
main-loop.c timers: properly prefix init_clocks() 2025-11-03 11:59:32 +01:00
memalign.c
memfd.c physmem: fd-based shared memory 2025-01-29 11:43:04 -03:00
meson.build qemu-thread: Use futex for QemuEvent on Windows 2025-06-06 14:32:55 +02:00
mmap-alloc.c util/mmap-alloc: qemu_fd_getfs() 2023-04-24 11:29:00 +02:00
module.c overall: Remove unnecessary g_strdup_printf() calls 2025-02-14 08:49:06 +03:00
notify.c notify: pass error to notifier with return 2024-02-28 11:31:28 +08:00
nvdimm-utils.c
osdep.c migration: Add direct-io parameter 2024-06-21 09:47:22 -03:00
oslib-posix.c oslib: qemu_clear_cloexec 2025-10-03 09:48:02 -04:00
oslib-win32.c oslib: qemu_clear_cloexec 2025-10-03 09:48:02 -04:00
path.c
qdist.c util: spelling fixes 2023-08-31 19:47:43 +02:00
qemu-co-shared-resource.c util/co-shared-resource: Remove unused co_try_get_from_shres 2024-09-30 10:53:18 +03:00
qemu-co-timeout.c util: add qemu-co-timeout 2022-06-29 10:56:12 +03:00
qemu-config.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +01:00
qemu-coroutine-io.c aio: remove aio_disable_external() API 2023-05-30 17:37:26 +02:00
qemu-coroutine-lock.c atomics: eliminate mb_read/mb_set 2023-06-06 09:42:14 +02:00
qemu-coroutine-sleep.c coroutine: Clean up superfluous inclusion of qemu/coroutine.h 2023-01-19 10:18:28 +01:00
qemu-coroutine.c util/coroutine: fix -Werror=maybe-uninitialized false-positive 2024-10-02 16:14:29 +04:00
qemu-option.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +01:00
qemu-print.c
qemu-progress.c
qemu-sockets.c util/qemu-sockets: Introduce inet socket options controlling TCP keep-alive 2025-05-22 11:24:41 +01:00
qemu-thread-common.h bql: Fix bql_locked status with condvar APIs 2025-11-03 11:59:32 +01:00
qemu-thread-posix.c qemu-thread: Use futex for QemuEvent on Windows 2025-06-06 14:32:55 +02:00
qemu-thread-win32.c qemu-thread: Use futex for QemuEvent on Windows 2025-06-06 14:32:55 +02:00
qemu-timer-common.c
qemu-timer.c timers: properly prefix init_clocks() 2025-11-03 11:59:32 +01:00
qht.c cleanup: Drop pointless return at end of function 2025-04-24 09:33:42 +02:00
qsp.c system/cpus: rename qemu_mutex_lock_iothread() to bql_lock() 2024-01-08 10:45:43 -05:00
qtree.c tcg: use QTree instead of GTree 2023-03-28 15:23:10 -07:00
range.c util/range.c: spelling fix: inbetween 2023-11-15 12:06:05 +03:00
rcu.c rcu: Unify force quiescent state 2025-10-28 12:39:59 +01:00
readline.c util/readline: Add C-u shortcut 2024-06-19 12:42:03 +02:00
reserved-region.c util/reserved-region: Add new ReservedRegion helpers 2023-11-03 09:20:31 +01:00
s390x_pci_mmio.c util: Add functions for s390x mmio read/write 2025-05-08 10:03:07 -04:00
selfmap.c util/selfmap: Use dev_t and ino_t in MapInfo 2023-09-01 13:34:03 -07:00
stats64.c stat64: Add stat64_set() operation 2023-04-27 16:39:43 +02:00
sys_membarrier.c
systemd.c systemd: Also clear LISTEN_FDNAMES during systemd socket activation 2023-05-03 14:00:08 -05:00
thread-context.c qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
thread-pool.c thread-pool: Implement generic (non-AIO) pool support 2025-03-06 06:47:33 +01:00
throttle.c throttle: use THROTTLE_MAX/ARRAY_SIZE for hard code 2023-08-29 10:49:24 +02:00
timed-average.c license: Simplify GPL-2.0-or-later license descriptions 2024-09-20 10:11:59 +03:00
trace-events thread-pool: Rename AIO pool functions to *_aio() and data types to *Aio 2025-03-06 06:47:33 +01:00
trace.h
transactions.c
unicode.c
userfaultfd.c util/userfaultfd: Remove unused uffd_poll_events 2024-10-08 15:28:55 -04:00
uuid.c util/uuid: Add UUID_STR_LEN definition 2023-11-03 09:20:31 +01:00
vfio-helpers.c include/system: Move exec/memory.h to system/memory.h 2025-04-23 14:08:21 -07:00
vhost-user-server.c util/vhost-user-server: vu_message_read(): improve error handling 2025-09-19 12:46:07 +01:00
yank.c qapi: Fix dangling references to docs/devel/qapi-code-gen.txt 2024-01-26 07:04:53 +01:00