[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v2 4/4] linux-aio: poll ring for completions
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH v2 4/4] linux-aio: poll ring for completions |
Date: |
Wed, 16 Nov 2016 17:47:02 +0000 |
The Linux AIO userspace ABI includes a ring that is shared with the
kernel. This allows userspace programs to process completions without
system calls.
Add an AioContext poll handler to check for completions in the ring.
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
block/linux-aio.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/block/linux-aio.c b/block/linux-aio.c
index 69c4ed5..03ab741 100644
--- a/block/linux-aio.c
+++ b/block/linux-aio.c
@@ -255,6 +255,20 @@ static void qemu_laio_completion_cb(EventNotifier *e)
}
}
+static bool qemu_laio_poll_cb(void *opaque)
+{
+ EventNotifier *e = opaque;
+ LinuxAioState *s = container_of(e, LinuxAioState, e);
+ struct io_event *events;
+
+ if (!io_getevents_peek(s->ctx, &events)) {
+ return false;
+ }
+
+ qemu_laio_process_completions_and_submit(s);
+ return true;
+}
+
static void laio_cancel(BlockAIOCB *blockacb)
{
struct qemu_laiocb *laiocb = (struct qemu_laiocb *)blockacb;
@@ -448,7 +462,8 @@ void laio_attach_aio_context(LinuxAioState *s, AioContext
*new_context)
s->aio_context = new_context;
s->completion_bh = aio_bh_new(new_context, qemu_laio_completion_bh, s);
aio_set_event_notifier(new_context, &s->e, false,
- qemu_laio_completion_cb, NULL);
+ qemu_laio_completion_cb,
+ qemu_laio_poll_cb);
}
LinuxAioState *laio_init(void)
--
2.7.4
- [Qemu-devel] [PATCH v2 0/4] aio: experimental virtio-blk polling mode, Stefan Hajnoczi, 2016/11/16
- [Qemu-devel] [PATCH v2 1/4] aio: add AioPollFn and io_poll() interface, Stefan Hajnoczi, 2016/11/16
- [Qemu-devel] [PATCH v2 2/4] aio: add polling mode to AioContext, Stefan Hajnoczi, 2016/11/16
- [Qemu-devel] [PATCH v2 3/4] virtio: poll virtqueues for new buffers, Stefan Hajnoczi, 2016/11/16
- [Qemu-devel] [PATCH v2 4/4] linux-aio: poll ring for completions,
Stefan Hajnoczi <=
- Re: [Qemu-devel] [PATCH v2 0/4] aio: experimental virtio-blk polling mode, no-reply, 2016/11/16
- Re: [Qemu-devel] [PATCH v2 0/4] aio: experimental virtio-blk polling mode, Karl Rister, 2016/11/17