qemu_bh_delete(data->bh);/* Prevent race with block_job_defer_to_main_loop() */aio_context_acquire(data->aio_context);/* Fetch BDS AioContext again, in case it has changed */aio_context = bdrv_get_aio_context(data->job->bs);aio_context_acquire(aio_context); data->fn(data->job...
AioContext Context information storage for asyncio. If you're interested in knowing more about the rationale behind writing this library, please read our blog post Context information storage for asyncio. Project Information AioContext is released under the MIT license, its documentation lives at Read...
现在,我们开始分析异步 IO 上下文的创建过程,异步 IO 上下文的创建通过调用 io_setup 函数完成,而 io_setup 函数会调用内核函数 sys_io_setup,其实现如下: asmlinkage long sys_io_setup(unsigned nr_events, aio_context_t *ctxp) { struct kioctx *ioctx = NULL; unsigned long ctx; long ret; ... io...
Processes were hung inaiocontext when one of the paths to the LUN was lost. For database cluster nodes, this could cause eviction of one of the nodes. Raw [31714012.691250] INFO: task ora_lgwr_oexsdb:12586 blocked for more than 120 seconds. [31714012.691254] Tainted: P OE --- - - 4....
1、SYS_io_setup:建立 aio 的 context 调用 setup 来建立 aio 上下文) 2、SYS_io_submit:提交 I/O 操作请求 3、SYS_io_getevents:获取已完成的 I/O 事件 4、SYS_io_cancel:取消 I/O 操作请求 5、SYS_io_destroy:毁销 aio 的 context 使用方法: ...
aio_context_t ctx;struct iocb cb;struct iocb*cbs[1];char data[4096];struct io_event events[1];int ret;int fd=/* 打开一个文件,获得fd */;ctx=0;ret=io_setup(128,&ctx);// 初始化一个同时处理最大128个fd的aio ctx/* 初始化 IO control block */memset(&cb,0,sizeof(cb));cb.aio...
Python 3.7 added keyword argumentcontexttocall_soon()and its family methods. By default those methods will copy (inherit) the current context and run the given method in that context. Butaiocontextvarswon't touch the loop, so in order to achieve the same effect, you'll need to: ...
io_destroy取消所有提交的异步 I/O 请求,并销毁异步 I/O context。 正常情况下,Linux AIO 的流程如下: 调用io_setup创建一个 I/O context 用于提交和收割 I/O 请求。 创建1~n 和 I/O 请求,调用io_submit提交请求。 I/O 请求执行完成,通过 DMA 直接将数据传输到 user buffer。
aio_context_t ctx;structiocbcb;structiocb*cbs[1];chardata[4096];structio_eventevents[1];intret;intfd=/* 打开一个文件,获得fd */;ctx=0;ret=io_setup(128,&ctx);// 初始化一个同时处理最大128个fd的aio ctx/* 初始化 IO control block */memset(&cb,0,sizeof(cb));cb.aio_fildes=fd;...
使用AIO的第一步就是创建AIO上下文,AIO上下文用于跟踪进程请求的异步IO的运行情况。AIO上下文在用户空间对应数据结果aio_context_t: //linux/aio_abi.h typedef unsigned long aio_context_t; //创建AIO上下文 int io_setup(unsigned nr_events, aio_context_t *ctxp); ...