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aio: add flag to skip fds to aio_dispatch()

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Polling mode will not call ppoll(2)/epoll_wait(2).  Therefore we know
there are no fds ready and should avoid looping over fd handlers in
aio_dispatch().

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20161201192652.9509-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2016-12-01 19:26:40 +00:00
parent 0891ee1112
commit 721671ade7
4 changed files with 20 additions and 8 deletions
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6
include/block/aio.h
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@ -295,8 +295,12 @@ bool aio_pending(AioContext *ctx);
/* Dispatch any pending callbacks from the GSource attached to the AioContext.
*
* This is used internally in the implementation of the GSource.
*
* @dispatch_fds: true to process fds, false to skip them
* (can be used as an optimization by callers that know there
* are no fds ready)
*/
bool aio_dispatch(AioContext *ctx);
bool aio_dispatch(AioContext *ctx, bool dispatch_fds);
/* Progress in completing AIO work to occur. This can issue new pending
* aio as a result of executing I/O completion or bh callbacks.