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[Qemu-devel] [PULL 18/35] aio-win32: add aio_set_dispatching optimizatio
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PULL 18/35] aio-win32: add aio_set_dispatching optimization |
Date: |
Fri, 29 Aug 2014 17:29:46 +0100 |
From: Paolo Bonzini <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
aio-win32.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/aio-win32.c b/aio-win32.c
index 1ec434a..fd52686 100644
--- a/aio-win32.c
+++ b/aio-win32.c
@@ -144,12 +144,25 @@ bool aio_poll(AioContext *ctx, bool blocking)
{
AioHandler *node;
HANDLE events[MAXIMUM_WAIT_OBJECTS + 1];
- bool progress, first;
+ bool was_dispatching, progress, first;
int count;
int timeout;
+ was_dispatching = ctx->dispatching;
progress = false;
+ /* aio_notify can avoid the expensive event_notifier_set if
+ * everything (file descriptors, bottom halves, timers) will
+ * be re-evaluated before the next blocking poll(). This is
+ * already true when aio_poll is called with blocking == false;
+ * if blocking == true, it is only true after poll() returns.
+ *
+ * If we're in a nested event loop, ctx->dispatching might be true.
+ * In that case we can restore it just before returning, but we
+ * have to clear it now.
+ */
+ aio_set_dispatching(ctx, !blocking);
+
ctx->walking_handlers++;
/* fill fd sets */
@@ -170,6 +183,7 @@ bool aio_poll(AioContext *ctx, bool blocking)
timeout = blocking
? qemu_timeout_ns_to_ms(aio_compute_timeout(ctx)) : 0;
ret = WaitForMultipleObjects(count, events, FALSE, timeout);
+ aio_set_dispatching(ctx, true);
if (first && aio_bh_poll(ctx)) {
progress = true;
@@ -191,5 +205,6 @@ bool aio_poll(AioContext *ctx, bool blocking)
progress |= timerlistgroup_run_timers(&ctx->tlg);
+ aio_set_dispatching(ctx, was_dispatching);
return progress;
}
--
1.9.3
- [Qemu-devel] [PULL 09/35] block/quorum: add simple read pattern support, (continued)
- [Qemu-devel] [PULL 09/35] block/quorum: add simple read pattern support, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 11/35] blockdev: fix drive-mirror 'granularity' error message, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 12/35] AioContext: take bottom halves into account when computing aio_poll timeout, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 07/35] sheepdog: improve error handling for a case of failed lock, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 13/35] aio-win32: Evaluate timers after handles, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 06/35] sheepdog: adopting protocol update for VDI locking, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 14/35] aio-win32: Factor out duplicate code into aio_dispatch_handlers, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 15/35] AioContext: run bottom halves after polling, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 16/35] AioContext: export and use aio_dispatch, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 17/35] test-aio: test timers on Windows too, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 18/35] aio-win32: add aio_set_dispatching optimization,
Stefan Hajnoczi <=
- [Qemu-devel] [PULL 19/35] AioContext: introduce aio_prepare, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 20/35] qemu-coroutine-io: fix for Win32, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 22/35] sheepdog: fix a core dump while do auto-reconnecting, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 21/35] aio-win32: add support for sockets, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 23/35] nbd: Drop nbd_can_read(), Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 24/35] block: Add AIO context notifiers, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 26/35] block: fix overlapping multiwrite requests, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 27/35] qemu-iotests: add multiwrite test cases, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 25/35] nbd: Follow the BDS' AIO context, Stefan Hajnoczi, 2014/08/29
- [Qemu-devel] [PULL 29/35] block: acquire AioContext in do_drive_del(), Stefan Hajnoczi, 2014/08/29