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[Qemu-devel] [PATCH 09/12] file-posix: Avoid aio_worker() for QEMU_AIO_R
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH 09/12] file-posix: Avoid aio_worker() for QEMU_AIO_READ/WRITE |
Date: |
Wed, 31 Oct 2018 22:56:19 +0100 |
aio_worker() doesn't add anything interesting, it's only a useless
indirection. Call the handler function directly instead.
As we know that this handler function is only called from coroutine
context and the coroutine stays around until the worker thread finishes,
we can keep RawPosixAIOData on the stack.
Signed-off-by: Kevin Wolf <address@hidden>
---
block/file-posix.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/block/file-posix.c b/block/file-posix.c
index 4989208ba3..c5e83140d3 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1279,8 +1279,9 @@ static ssize_t handle_aiocb_rw_linear(RawPosixAIOData
*aiocb, char *buf)
return offset;
}
-static ssize_t handle_aiocb_rw(RawPosixAIOData *aiocb)
+static int handle_aiocb_rw(void *opaque)
{
+ RawPosixAIOData *aiocb = opaque;
ssize_t nbytes;
char *buf;
@@ -1772,15 +1773,11 @@ static int aio_worker(void *arg)
ssize_t ret = 0;
switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
- case QEMU_AIO_READ:
- ret = handle_aiocb_rw(aiocb);
- break;
- case QEMU_AIO_WRITE:
- ret = handle_aiocb_rw(aiocb);
- break;
case QEMU_AIO_IOCTL:
ret = handle_aiocb_ioctl(aiocb);
break;
+ case QEMU_AIO_READ:
+ case QEMU_AIO_WRITE:
case QEMU_AIO_FLUSH:
case QEMU_AIO_DISCARD:
case QEMU_AIO_WRITE_ZEROES:
@@ -1844,6 +1841,7 @@ static int coroutine_fn raw_co_prw(BlockDriverState *bs,
uint64_t offset,
uint64_t bytes, QEMUIOVector *qiov, int
type)
{
BDRVRawState *s = bs->opaque;
+ RawPosixAIOData acb;
if (fd_open(bs) < 0)
return -EIO;
@@ -1866,7 +1864,20 @@ static int coroutine_fn raw_co_prw(BlockDriverState *bs,
uint64_t offset,
}
}
- return paio_submit_co(bs, s->fd, offset, qiov, bytes, type);
+ acb = (RawPosixAIOData) {
+ .bs = bs,
+ .aio_fildes = s->fd,
+ .aio_type = type,
+ .aio_offset = offset,
+ .aio_nbytes = bytes,
+ .io = {
+ .iov = qiov->iov,
+ .niov = qiov->niov,
+ },
+ };
+
+ assert(qiov->size == bytes);
+ return raw_thread_pool_submit(bs, handle_aiocb_rw, &acb);
}
static int coroutine_fn raw_co_preadv(BlockDriverState *bs, uint64_t offset,
--
2.19.1
- [Qemu-devel] [PATCH 00/12] file-posix: Simplify delegation to worker thread, Kevin Wolf, 2018/10/31
- [Qemu-devel] [PATCH 02/12] file-posix: Factor out raw_thread_pool_submit(), Kevin Wolf, 2018/10/31
- [Qemu-devel] [PATCH 03/12] file-posix: Avoid aio_worker() for QEMU_AIO_TRUNCATE, Kevin Wolf, 2018/10/31
- [Qemu-devel] [PATCH 06/12] file-posix: Avoid aio_worker() for QEMU_AIO_DISCARD, Kevin Wolf, 2018/10/31
- [Qemu-devel] [PATCH 04/12] file-posix: Avoid aio_worker() for QEMU_AIO_COPY_RANGE, Kevin Wolf, 2018/10/31
- [Qemu-devel] [PATCH 07/12] file-posix: Avoid aio_worker() for QEMU_AIO_FLUSH, Kevin Wolf, 2018/10/31
- [Qemu-devel] [PATCH 05/12] file-posix: Avoid aio_worker() for QEMU_AIO_WRITE_ZEROES, Kevin Wolf, 2018/10/31
- [Qemu-devel] [PATCH 01/12] file-posix: Reorganise RawPosixAIOData, Kevin Wolf, 2018/10/31
- [Qemu-devel] [PATCH 09/12] file-posix: Avoid aio_worker() for QEMU_AIO_READ/WRITE,
Kevin Wolf <=
- [Qemu-devel] [PATCH 10/12] file-posix: Remove paio_submit_co(), Kevin Wolf, 2018/10/31
- [Qemu-devel] [PATCH 12/12] file-posix: Avoid aio_worker() for QEMU_AIO_IOCTL, Kevin Wolf, 2018/10/31
- [Qemu-devel] [PATCH 08/12] file-posix: Move read/write operation logic out of aio_worker(), Kevin Wolf, 2018/10/31
- [Qemu-devel] [PATCH 11/12] file-posix: Switch to .bdrv_co_ioctl, Kevin Wolf, 2018/10/31