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qemu-e2k/qapi
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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
..
acpi.json qapi: fix example of ACPI_DEVICE_OST event 2022-03-31 12:35:59 +02:00
audio.json schemas: add missing vim modeline 2022-01-27 11:20:50 +01:00
authz.json qapi/qom: Add ObjectOptions for authz-* 2021-03-19 10:17:13 +01:00
block-core.json qapi: rename BlockDirtyBitmapMergeSource to BlockDirtyBitmapOrStr 2022-04-26 13:13:50 -05:00
block-export.json qapi: nbd-export: allow select bitmaps by node/name pair 2022-04-26 13:15:19 -05:00
block.json block: add 'force' parameter to 'blockdev-change-medium' command 2022-04-25 12:02:36 +02:00
char.json ui/dbus: add chardev backend & interface 2021-12-21 10:50:22 +04:00
common.json monitor: introduce HumanReadableText and HMP support 2021-11-02 15:55:13 +00:00
compat.json qapi: Belatedly adjust limitations documentation 2022-02-28 11:39:35 +01:00
control.json monitor: remove 'query-events' QMP command 2021-03-18 09:22:55 +00:00
crypto.json crypto: replace 'des-rfb' cipher with 'des' 2021-07-14 14:15:52 +01:00
dump.json qapi: fix example of dump-guest-memory 2022-03-31 12:35:59 +02:00
error.json schemas: Add vim modeline 2020-08-03 08:28:08 +02:00
introspect.json qapi: Add feature flags to enum members 2021-10-27 17:18:55 +02:00
job.json migration: introduce snapshot-{save, load, delete} QMP commands 2021-02-08 11:19:52 +00:00
machine-target.json qapi: make 'if' condition strings simple identifiers 2021-08-26 13:53:56 +02:00
machine.json qapi: fix example of query-memdev command 2022-04-05 12:30:45 +02:00
meson.build qapi: generate trace events by default 2022-01-27 15:17:35 +01:00
migration.json qapi: Fix documentation for query-xen-replication-status 2022-04-21 10:22:33 +02:00
misc-target.json qapi: Fix version of cpu0-id field 2022-04-21 10:23:06 +02:00
misc.json rtc: Have event RTC_CHANGE identify the RTC by QOM path 2022-02-28 11:39:35 +01:00
net.json qapi: fix example of netdev_add command 2022-04-05 12:30:45 +02:00
opts-visitor.c qapi, qemu-options: make all parsing visitors parse boolean options the same 2020-11-04 12:00:40 -05:00
pci.json qapi: Normalize version references x.y.0 to just x.y 2020-12-10 17:16:44 +01:00
pragma.json schemas: add missing vim modeline 2022-03-31 12:34:51 +02:00
qapi-clone-visitor.c qapi: Make visitor functions taking Error ** return bool, not void 2020-07-10 15:18:08 +02:00
qapi-dealloc-visitor.c qapi: Make visitor functions taking Error ** return bool, not void 2020-07-10 15:18:08 +02:00
qapi-forward-visitor.c qapi: remove needless include 2022-03-22 14:46:18 +04:00
qapi-schema.json qemu-options: New -compat to set policy for deprecated interfaces 2021-03-19 15:43:33 +01:00
qapi-type-helpers.c monitor: introduce HumanReadableText and HMP support 2021-11-02 15:55:13 +00:00
qapi-util.c qapi: Fix stale reference to scripts/qapi.py in a comment 2022-02-28 11:39:35 +01:00
qapi-visit-core.c qapi: Factor out compat_policy_input_ok() 2021-10-29 21:27:20 +02:00
qdev.json softmmu: fix device deletion events with -device JSON syntax 2022-01-14 12:03:16 +01:00
qmp-dispatch.c qapi: remove needless include 2022-03-22 14:46:17 +04:00
qmp-event.c Replace qemu_gettimeofday() with g_get_real_time() 2022-04-06 10:50:37 +02:00
qmp-registry.c qapi: Generalize command policy checking 2021-10-29 18:24:46 +02:00
qobject-input-visitor.c include: add qemu/keyval.h 2022-04-21 17:03:51 +04:00
qobject-output-visitor.c qapi: Extend -compat to set policy for unstable interfaces 2021-10-29 21:28:01 +02:00
qom.json util/event-loop-base: Introduce options to set the thread pool size 2022-05-09 10:43:23 +01:00
rdma.json schemas: Add vim modeline 2020-08-03 08:28:08 +02:00
replay.json qapi: fix examples: replay-break and replay-seek 2022-04-05 12:30:45 +02:00
rocker.json schemas: Add vim modeline 2020-08-03 08:28:08 +02:00
run-state.json qapi: fix example of MEMORY_FAILURE 2022-03-31 12:35:40 +02:00
sockets.json qapi: Fix typo 2022-04-21 10:22:54 +02:00
string-input-visitor.c qapi, qemu-options: make all parsing visitors parse boolean options the same 2020-11-04 12:00:40 -05:00
string-output-visitor.c qapi: remove needless include 2022-03-22 14:46:18 +04:00
tpm.json qapi: Convert simple union TpmTypeOptions to flat one 2021-09-27 08:22:25 +02:00
trace-events qapi: Generalize struct member policy checking 2021-10-29 18:23:09 +02:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
trace.json qapi: fix example of trace-event-get-state command 2022-04-05 12:30:45 +02:00
transaction.json qapi: deprecate drive-backup 2021-11-09 18:21:19 +01:00
ui.json qapi/ui: add 'display-update' command for changing listen address 2022-04-27 07:51:01 +02:00
yank.json Introduce yank feature 2021-01-13 10:21:17 +01:00