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In test, we usually expect controllable disk speed. For example, in a raid array, we'd like some disks are fast and some are slow. MD RAID actually has a feature for this. To test the feature, we'd like to make the disk run in specific speed. block throttling probably can be used for this purpose, but it requires cgroup setup. Here we just implement a simple throttling mechanism in the driver. There is slight fluctuation in the mechanism, but it's good enough for test. To configure the bandwidth cap, user sets the 'mbps' attribute. mbps is MB/s. Based on original patch from Kyungchan Koh Signed-off-by: Kyungchan Koh <kkc6196@fb.com> Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.