[CC += linux-api] Hello Goldwyn, Since this is a kernel-user-space API change, please CC linux-api@ (and for future iterations of this patch series). The kernel source file Documentation/SubmitChecklist notes that all Linux kernel patches that change userspace interfaces should be CCed to linux-api@xxxxxxxxxxxxxxx, so that the various parties who are interested in API changes are informed. For further information, see https://www.kernel.org/doc/man-pages/linux-api-ml.html Cheers, Michael On Tue, Feb 14, 2017 at 3:45 AM, Goldwyn Rodrigues <rgoldwyn@xxxxxxx> wrote: > This series adds nonblocking feature to asynchronous I/O writes. > io_submit() can be delayed because of a number of reason: > - Block allocation for files > - Data writebacks for direct I/O > - Sleeping because of waiting to acquire i_rwsem > - Congested block device > > The goal of the patch series is to return -EAGAIN/-EWOULDBLOCK if > any of these conditions are met. This way userspace can push most > of the write()s to the kernel to the best of its ability to complete > and if it returns -EAGAIN, can defer it to another thread. > > In order to enable this, IOCB_FLAG_NONBLOCKING is introduced in > uapi/linux/aio_abi.h which translates to IOCB_BLOCKING for struct iocb. > > This feature is provided for direct I/O of asynchronous I/O only. I have > tested it against xfs, ext4, and btrfs. > > -- > Goldwyn > > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Author of "The Linux Programming Interface", http://blog.man7.org/
