Stefan Hajnoczi 8c6b0356b5 util/async: make bh_aio_poll() O(1) ... The ctx->first_bh list contains all created BHs, including those that are not scheduled. The list is iterated by the event loop and therefore has O(n) time complexity with respected to the number of created BHs. Rewrite BHs so that only scheduled or deleted BHs are enqueued. Only BHs that actually require action will be iterated. One semantic change is required: qemu_bh_delete() enqueues the BH and therefore invokes aio_notify(). The tests/test-aio.c:test_source_bh_delete_from_cb() test case assumed that g_main_context_iteration(NULL, false) returns false after qemu_bh_delete() but it now returns true for one iteration. Fix up the test case. This patch makes aio_compute_timeout() and aio_bh_poll() drop from a CPU profile reported by perf-top(1). Previously they combined to 9% CPU utilization when AioContext polling is commented out and the guest has 2 virtio-blk,num-queues=1 and 99 virtio-blk,num-queues=32 devices. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 20200221093951.1414693-1-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>		2020-02-22 08:26:47 +00:00
..
acceptance	tests/acceptance: Remove shebang header	2020-02-07 15:12:48 +01:00
data	virt/acpi: update golden masters for DSDT update	2020-02-13 14:14:53 +00:00
decode
docker	drop "from __future__ import print_function"	2020-02-07 15:15:16 +01:00
fp	testing: don't nest build for fp-test	2020-01-09 11:41:29 +00:00
guest-debug	drop "from __future__ import print_function"	2020-02-07 15:15:16 +01:00
image-fuzzer	image-fuzzer: Use OSerror.strerror instead of tuple subscript	2019-11-05 16:36:11 +01:00
keys
migration	drop "from __future__ import print_function"	2020-02-07 15:15:16 +01:00
multiboot
perf/block/qcow2
plugin	tcg plugins: expose an API version concept	2019-11-12 14:32:55 +00:00
qapi-schema	drop "from __future__ import print_function"	2020-02-07 15:15:16 +01:00
qemu-iotests	iotests: Test snapshot -l field separation	2020-02-20 16:43:42 +01:00
qtest	tests/qtest/libqos/qgraph: Remove superfluous semicolons	2020-02-18 20:20:49 +01:00
rocker
tcg	tests/tcg: gate pauth-% tests on having compiler support	2020-02-04 17:13:29 +00:00
uefi-test-tools	edk2 build scripts: work around TianoCore#1607 without forcing Python 2	2019-10-07 15:14:15 +02:00
vm	drop "from __future__ import print_function"	2020-02-07 15:15:16 +01:00
vmstate-static-checker-data
.gitignore	qapi: Generate command registration stuff into separate files	2020-01-14 11:01:58 +01:00
atomic64-bench.c
atomic_add-bench.c
benchmark-crypto-cipher.c	tests: benchmark crypto with fixed data size, not time period	2019-10-28 13:32:21 +01:00
benchmark-crypto-hash.c	tests: benchmark crypto with fixed data size, not time period	2019-10-28 13:32:21 +01:00
benchmark-crypto-hmac.c
check-block-qdict.c
check-block.sh	build: move TARGET_GPROF to config-host.mak	2020-02-12 16:29:27 +01:00
check-qdict.c
check-qjson.c
check-qlist.c
check-qlit.c
check-qnull.c
check-qnum.c
check-qobject.c
check-qom-interface.c
check-qom-proplist.c
check-qstring.c
crypto-tls-psk-helpers.c
crypto-tls-psk-helpers.h
crypto-tls-x509-helpers.c
crypto-tls-x509-helpers.h
dbus-vmstate-daemon.sh	tests: add dbus-vmstate-test	2020-01-06 18:41:32 +04:00
io-channel-helpers.c
io-channel-helpers.h
iothread.c	tests/iothread: Always connect iothread GSource to a GMainContext	2020-01-07 14:32:57 +00:00
iothread.h
Makefile.include	rcu_queue: add QSLIST functions	2020-02-22 08:26:47 +00:00
pkix_asn1_tab.c
ptimer-test-stubs.c
ptimer-test.c	tests/ptimer: Remove unnecessary inclusion of libqtest.h	2020-01-12 11:42:40 +01:00
ptimer-test.h
qht-bench.c
rcutorture.c
requirements.txt
socket-helpers.c
socket-helpers.h
test-aio-multithread.c
test-aio.c	util/async: make bh_aio_poll() O(1)	2020-02-22 08:26:47 +00:00
test-authz-list.c
test-authz-listfile.c
test-authz-pam.c
test-authz-simple.c
test-base64.c
test-bdrv-drain.c
test-bdrv-graph-mod.c
test-bitcnt.c
test-bitmap.c	tests: use g_test_rand_int	2019-12-17 09:05:23 +01:00
test-bitops.c
test-block-backend.c
test-block-iothread.c	block: Add @exact parameter to bdrv_co_truncate()	2019-10-28 12:00:07 +01:00
test-blockjob-txn.c
test-blockjob.c	tests-blockjob: Use error_free_or_abort()	2019-12-18 08:36:16 +01:00
test-bufferiszero.c
test-char.c	chardev: Use QEMUChrEvent enum in IOEventHandler typedef	2020-01-08 11:15:35 +01:00
test-clone-visitor.c
test-coroutine.c
test-crypto-afsplit.c
test-crypto-block.c
test-crypto-cipher.c
test-crypto-hash.c
test-crypto-hmac.c
test-crypto-ivgen.c
test-crypto-pbkdf.c
test-crypto-secret.c
test-crypto-tlscredsx509.c	glib: use portable g_setenv()	2019-12-17 09:05:23 +01:00
test-crypto-tlssession.c	glib: use portable g_setenv()	2019-12-17 09:05:23 +01:00
test-crypto-xts.c
test-cutils.c
test-hbitmap.c	util/hbitmap: strict hbitmap_reset	2019-10-17 17:02:32 -04:00
test-image-locking.c
test-int128.c
test-io-channel-buffer.c
test-io-channel-command.c
test-io-channel-file.c
test-io-channel-socket.c
test-io-channel-tls.c	glib: use portable g_setenv()	2019-12-17 09:05:23 +01:00
test-io-task.c
test-iov.c
test-keyval.c	test-keyval: Tighten test of trailing crap after size	2019-12-18 12:28:44 +01:00
test-logging.c	test-logging: Fix -Werror=maybe-uninitialized warning	2020-02-04 09:00:57 +01:00
test-mul64.c
test-opts-visitor.c
test-qapi-util.c
test-qdev-global-props.c	qdev: set properties with device_class_set_props()	2020-01-24 20:59:15 +01:00
test-qdist.c
test-qemu-opts.c
test-qga.c	tests: use g_test_rand_int	2019-12-17 09:05:23 +01:00
test-qgraph.c
test-qht-par.c
test-qht.c
test-qmp-cmds.c	qapi: Generate command registration stuff into separate files	2020-01-14 11:01:58 +01:00
test-qmp-event.c
test-qobject-input-visitor.c
test-qobject-output-visitor.c	tests: Clean up initialization of Error *err variables	2019-12-18 08:36:15 +01:00
test-rcu-list.c	rcu_queue: add QSLIST functions	2020-02-22 08:26:47 +00:00
test-rcu-simpleq.c
test-rcu-slist.c	rcu_queue: add QSLIST functions	2020-02-22 08:26:47 +00:00
test-rcu-tailq.c
test-replication.c
test-shift128.c
test-string-input-visitor.c
test-string-output-visitor.c	tests: Clean up initialization of Error *err variables	2019-12-18 08:36:15 +01:00
test-thread-pool.c
test-throttle.c
test-timed-average.c
test-util-filemonitor.c	tests/test-util-filemonitor: Skip test on non-x86 Travis containers	2019-12-18 20:17:45 +00:00
test-util-sockets.c
test-uuid.c
test-visitor-serialization.c
test-vmstate.c	migration: Support QLIST migration	2020-01-20 09:10:23 +01:00
test-write-threshold.c
test-x86-cpuid.c
test-xbzrle.c
vhost-user-bridge.c	core: replace getpagesize() with qemu_real_host_page_size	2019-10-26 15:38:06 +02:00