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Jens Axboe bcf5a06304 io_uring: support true async buffered reads, if file provides it
If the file is flagged with FMODE_BUF_RASYNC, then we don't have to punt
the buffered read to an io-wq worker. Instead we can rely on page
unlocking callbacks to support retry based async IO. This is a lot more
efficient than doing async thread offload.

The retry is done similarly to how we handle poll based retry. From
the unlock callback, we simply queue the retry to a task_work based
handler.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-06-21 20:44:26 -06:00
arch
block block: provide plug based way of signaling forced no-wait semantics 2020-06-21 20:44:25 -06:00
certs
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Documentation
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fs io_uring: support true async buffered reads, if file provides it 2020-06-21 20:44:26 -06:00
include mm: add kiocb_wait_page_queue_init() helper 2020-06-21 20:44:26 -06:00
init
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mm mm: support async buffered reads in generic_file_buffered_read() 2020-06-21 20:44:25 -06:00
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security selinux/stable-5.8 PR 20200621 2020-06-21 15:41:24 -07:00
sound
tools io_uring: change the poll type to be 32-bits 2020-06-21 20:44:00 -06:00
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Makefile Linux 5.8-rc2 2020-06-21 15:45:29 -07:00
README

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.