From 076682885d6fe521ed005b988fde6a67ec6818df Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Tue, 30 May 2023 14:09:58 -0400 Subject: block/linux-aio: convert to blk_io_plug_call() API Stop using the .bdrv_co_io_plug() API because it is not multi-queue block layer friendly. Use the new blk_io_plug_call() API to batch I/O submission instead. Note that a dev_max_batch check is dropped in laio_io_unplug() because the semantics of unplug_fn() are different from .bdrv_co_unplug(): 1. unplug_fn() is only called when the last blk_io_unplug() call occurs, not every time blk_io_unplug() is called. 2. unplug_fn() is per-thread, not per-BlockDriverState, so there is no way to get per-BlockDriverState fields like dev_max_batch. Therefore this condition cannot be moved to laio_unplug_fn(). It is not obvious that this condition affects performance in practice, so I am removing it instead of trying to come up with a more complex mechanism to preserve the condition. Signed-off-by: Stefan Hajnoczi Reviewed-by: Eric Blake Acked-by: Kevin Wolf Reviewed-by: Stefano Garzarella Message-id: 20230530180959.1108766-6-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi --- include/block/raw-aio.h | 7 ------- 1 file changed, 7 deletions(-) (limited to 'include/block') diff --git a/include/block/raw-aio.h b/include/block/raw-aio.h index da60ca1..0f63c28 100644 --- a/include/block/raw-aio.h +++ b/include/block/raw-aio.h @@ -62,13 +62,6 @@ int coroutine_fn laio_co_submit(int fd, uint64_t offset, QEMUIOVector *qiov, void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context); void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context); - -/* - * laio_io_plug/unplug work in the thread's current AioContext, therefore the - * caller must ensure that they are paired in the same IOThread. - */ -void laio_io_plug(void); -void laio_io_unplug(uint64_t dev_max_batch); #endif /* io_uring.c - Linux io_uring implementation */ #ifdef CONFIG_LINUX_IO_URING -- cgit v1.1