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Jens Axboe 8af870aa5b block: enable bio caching use for passthru IO
bdev based polled O_DIRECT is currently quite a bit faster than
passthru on the same device, and one of the reaons is that we're not
able to use the bio caching for passthru IO.

If REQ_POLLED is set on the request, use the fs bio set for grabbing a
bio from the caches, if available. This saves 5-6% of CPU over head
for polled passthru IO.

Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-08-22 10:07:56 -06:00
Documentation asm goto: eradicate CC_HAS_ASM_GOTO 2022-08-21 10:06:28 -07:00
LICENSES
arch Misc irqchip fixes: LoongArch driver fixes and a Hyper-V IOMMU fix. 2022-08-21 15:09:55 -07:00
block block: enable bio caching use for passthru IO 2022-08-22 10:07:56 -06:00
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drivers block: Change the return type of blk_mq_map_queues() into void 2022-08-22 10:07:53 -06:00
fs 5 cifs/smb3 fixes, one for stable 2022-08-21 10:21:16 -07:00
include block: shrink rq_map_data a bit 2022-08-22 10:07:56 -06:00
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MAINTAINERS 5 cifs/smb3 fixes, one for stable 2022-08-21 10:21:16 -07:00
Makefile Linux 6.0-rc2 2022-08-21 17:32:54 -07:00
README

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.