On Tue, Aug 04, 2020 at 06:53:09PM +0200, Paolo Bonzini wrote:
> On 04/08/20 12:29, Stefan Hajnoczi wrote:
> > On Tue, Aug 04, 2020 at 06:28:04AM +0100, Stefan Hajnoczi wrote:
> >> @@ -597,15 +574,38 @@ bool aio_poll(AioContext *ctx, bool blocking)
> >> * system call---a single round of run_p
On 04/08/20 12:29, Stefan Hajnoczi wrote:
> On Tue, Aug 04, 2020 at 06:28:04AM +0100, Stefan Hajnoczi wrote:
>> @@ -597,15 +574,38 @@ bool aio_poll(AioContext *ctx, bool blocking)
>> * system call---a single round of run_poll_handlers_once suffices.
>> */
>> if (timeout || ctx->fdm
On Tue, Aug 04, 2020 at 06:28:04AM +0100, Stefan Hajnoczi wrote:
> @@ -597,15 +574,38 @@ bool aio_poll(AioContext *ctx, bool blocking)
> * system call---a single round of run_poll_handlers_once suffices.
> */
> if (timeout || ctx->fdmon_ops->need_wait(ctx)) {
> +/*
> +
Polling only monitors the ctx->notified field and does not need the
ctx->notifier EventNotifier to be signalled. Keep ctx->aio_notify_me
disabled while polling to avoid unnecessary EventNotifier syscalls.
This optimization improves virtio-blk 4KB random read performance by
18%. The following resul
