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linux-aio: add dev_max_batch parameter to laio_io_unplug()

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Between the submission of a request and the unplug, other devices
with larger limits may have been queued new requests without flushing
the batch.

Using the new `dev_max_batch` parameter, laio_io_unplug() can check
if the batch exceeds the device limit to flush the current batch.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20211026162346.253081-4-sgarzare@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefano Garzarella 2021-10-26 18:23:46 +02:00 • committed by Kevin Wolf
parent 512da21101
commit 68d7946648
3 changed files with 8 additions and 5 deletions
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8
block/linux-aio.c
View file

@ -356,11 +356,13 @@ void laio_io_plug(BlockDriverState *bs, LinuxAioState *s)
s->io_q.plugged++;
}
void laio_io_unplug(BlockDriverState *bs, LinuxAioState *s)
void laio_io_unplug(BlockDriverState *bs, LinuxAioState *s,
uint64_t dev_max_batch)
{
assert(s->io_q.plugged);
if (--s->io_q.plugged == 0 &&
!s->io_q.blocked && !QSIMPLEQ_EMPTY(&s->io_q.pending)) {
if (s->io_q.in_queue >= laio_max_batch(s, dev_max_batch) ||
(--s->io_q.plugged == 0 &&
!s->io_q.blocked && !QSIMPLEQ_EMPTY(&s->io_q.pending))) {
ioq_submit(s);
}
}