99e0cd4d55
chenxiang <chenxiang66@hisilicon.com> says: To support IO_URING IOPOLL support for hisi_sas, we need to: - Add and fill mq_poll interface to poll queue; - Ensure internal I/Os (including internal abort I/Os) are delivered and completed through non-iopoll queue (queue 0); Sending internal abort commands to non-poll queue actually requires to sending the abort command to every queue. This carries a a risk. Make iopoll support module parameter "experimental". I have tested performance on v3 hw with different modes as follows. 4K READs and 4K WRITEs both see an improvement when enabling poll mode: 4K READ 4K RANDREAD 4K WRITE 4K RANDWRITE interrupt + libaio 1770k 1316k 1197k 831k interrupt + io_uring 1848k 1390k 1238k 857k iopoll + io_uring 2117k 1364k 1874k 849k Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.