Nicolas Saenz Julienne 71ad4713cc util/event-loop-base: Introduce options to set the thread pool size ... The thread pool regulates itself: when idle, it kills threads until empty, when in demand, it creates new threads until full. This behaviour doesn't play well with latency sensitive workloads where the price of creating a new thread is too high. For example, when paired with qemu's '-mlock', or using safety features like SafeStack, creating a new thread has been measured take multiple milliseconds. In order to mitigate this let's introduce a new 'EventLoopBase' property to set the thread pool size. The threads will be created during the pool's initialization or upon updating the property's value, remain available during its lifetime regardless of demand, and destroyed upon freeing it. A properly characterized workload will then be able to configure the pool to avoid any latency spikes. Signed-off-by: Nicolas Saenz Julienne <nsaenzju@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Acked-by: Markus Armbruster <armbru@redhat.com> Message-id: 20220425075723.20019-4-nsaenzju@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>		2022-05-09 10:43:23 +01:00
..
aio-posix.c	util/event-loop-base: Introduce options to set the thread pool size	2022-05-09 10:43:23 +01:00
aio-posix.h	aio-posix: fix spurious ->poll_ready() callbacks in main loop	2022-03-17 11:23:18 +00:00
aio-wait.c
aio-win32.c	Remove qemu-common.h include from most units	2022-04-06 14:31:55 +02:00
aiocb.c
async.c	util/event-loop-base: Introduce options to set the thread pool size	2022-05-09 10:43:23 +01:00
atomic64.c	osdep: Move memalign-related functions to their own header	2022-03-07 13:16:49 +00:00
base64.c
bitmap.c	Replace config-time define HOST_WORDS_BIGENDIAN	2022-04-06 10:50:37 +02:00
bitops.c
block-helpers.c
block-helpers.h
buffer.c
bufferiszero.c	cpuid: use unsigned for max cpuid	2022-02-04 09:07:43 -05:00
cacheflush.c	include: Move qemu_[id]cache_* declarations to new qemu/cacheinfo.h	2022-02-21 13:30:20 +00:00
cacheinfo.c	include: Move qemu_[id]cache_* declarations to new qemu/cacheinfo.h	2022-02-21 13:30:20 +00:00
compatfd.c	util: replace pipe()+cloexec with g_unix_open_pipe()	2022-05-03 15:18:14 +04:00
coroutine-sigaltstack.c	Remove qemu-common.h include from most units	2022-04-06 14:31:55 +02:00
coroutine-ucontext.c	coroutine-ucontext: use QEMU_DEFINE_STATIC_CO_TLS()	2022-05-04 15:55:23 +02:00
coroutine-win32.c	coroutine-win32: use QEMU_DEFINE_STATIC_CO_TLS()	2022-05-04 15:55:23 +02:00
crc32c.c
crc-ccitt.c
cutils.c	include: move qemu_fdatasync() to osdep	2022-04-21 17:03:51 +04:00
dbus.c
drm.c
envlist.c	Use g_new() & friends where that makes obvious sense	2022-03-21 15:44:44 +01:00
error-report.c	error-report: fix g_date_time_format assertion	2022-04-28 08:51:56 +02:00
error.c
event_notifier-posix.c	Replace qemu_pipe() with g_unix_open_pipe()	2022-05-03 15:17:56 +04:00
event_notifier-win32.c	Remove qemu-common.h include from most units	2022-04-06 14:31:55 +02:00
fdmon-epoll.c
fdmon-io_uring.c	aio-posix: fix build failure io_uring 2.2	2022-03-17 11:23:18 +00:00
fdmon-poll.c
fifo8.c
filemonitor-inotify.c
filemonitor-stub.c
getauxval.c
guest-random.c
hbitmap.c	Use g_new() & friends where that makes obvious sense	2022-03-21 15:44:44 +01:00
hexdump.c	include: move C/util-related declarations to cutils.h	2022-04-06 14:31:43 +02:00
host-utils.c	Replace config-time define HOST_WORDS_BIGENDIAN	2022-04-06 10:50:37 +02:00
id.c
int128.c
iov.c	Remove qemu-common.h include from most units	2022-04-06 14:31:55 +02:00
iova-tree.c	util: add iova_tree_find_iova	2022-03-15 13:57:44 +08:00
keyval.c	include: add qemu/keyval.h	2022-04-21 17:03:51 +04:00
lockcnt.c
log.c	util/log: Support per-thread log files	2022-04-20 10:51:11 -07:00
main-loop.c	util/event-loop-base: Introduce options to set the thread pool size	2022-05-09 10:43:23 +01:00
memalign.c	osdep: Move memalign-related functions to their own header	2022-03-07 13:16:49 +00:00
memfd.c
meson.build	meson, configure: move libgio test to meson	2022-04-28 08:52:22 +02:00
mmap-alloc.c	Replace qemu_real_host_page variables with inlined functions	2022-04-06 10:50:38 +02:00
module.c
notify.c
nvdimm-utils.c
osdep.c	softmmu: remove deprecated --enable-fips option	2022-04-26 16:12:25 +01:00
oslib-posix.c	util: rename qemu_*block() socket functions	2022-05-03 15:53:20 +04:00
oslib-win32.c	util: rename qemu_*block() socket functions	2022-05-03 15:53:20 +04:00
path.c
qdist.c
qemu-co-shared-resource.c
qemu-config.c	remove -writeconfig	2022-04-28 08:51:56 +02:00
qemu-coroutine-io.c	Remove qemu-common.h include from most units	2022-04-06 14:31:55 +02:00
qemu-coroutine-lock.c
qemu-coroutine-sleep.c
qemu-coroutine.c	coroutine: use QEMU_DEFINE_STATIC_CO_TLS()	2022-05-04 15:55:23 +02:00
qemu-option.c
qemu-print.c
qemu-progress.c	include: move progress API to qemu-progress.h	2022-04-06 14:31:43 +02:00
qemu-sockets.c	Remove qemu-common.h include from most units	2022-04-06 14:31:55 +02:00
qemu-thread-common.h
qemu-thread-posix.c	thread-posix: optimize qemu_sem_timedwait with zero timeout	2022-04-06 14:31:56 +02:00
qemu-thread-win32.c	Remove qemu-common.h include from most units	2022-04-06 14:31:55 +02:00
qemu-timer-common.c
qemu-timer.c	Use g_new() & friends where that makes obvious sense	2022-03-21 15:44:44 +01:00
qht.c	osdep: Move memalign-related functions to their own header	2022-03-07 13:16:49 +00:00
qsp.c
range.c
rcu.c	rcu: use coroutine TLS macros	2022-03-04 18:14:40 +01:00
readline.c
selfmap.c
stats64.c
sys_membarrier.c
systemd.c
thread-pool.c	util/event-loop-base: Introduce options to set the thread pool size	2022-05-09 10:43:23 +01:00
throttle.c
timed-average.c
trace-events
trace.h
transactions.c
unicode.c
uri.c
userfaultfd.c
uuid.c
vfio-helpers.c	Replace qemu_real_host_page variables with inlined functions	2022-04-06 10:50:38 +02:00
vhost-user-server.c	util: rename qemu_*block() socket functions	2022-05-03 15:53:20 +04:00
yank.c