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Paolo Valente eb2fd80f9d block, bfq: replace mechanism for evaluating I/O intensity
Some BFQ mechanisms make their decisions on a bfq_queue basing also on
whether the bfq_queue is I/O bound. In this respect, the current logic
for evaluating whether a bfq_queue is I/O bound is rather rough. This
commits replaces this logic with a more effective one.

The new logic measures the percentage of time during which a bfq_queue
is active, and marks the bfq_queue as I/O bound if the latter if this
percentage is above a fixed threshold.

Tested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-01-25 14:18:29 -07:00
arch
block block, bfq: replace mechanism for evaluating I/O intensity 2021-01-25 14:18:29 -07:00
certs
crypto
Documentation bio: don't copy bvec for direct IO 2021-01-25 08:58:24 -07:00
drivers target/file: allocate the bvec array as part of struct target_core_file_cmd 2021-01-25 08:58:24 -07:00
fs bio: add a helper calculating nr segments to alloc 2021-01-25 08:58:24 -07:00
include bio: don't copy bvec for direct IO 2021-01-25 08:58:24 -07:00
init
ipc
kernel
lib iov_iter: optimise bvec iov_iter_advance() 2021-01-25 08:58:24 -07:00
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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.