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eac406c61c
One of the obvious use cases for these commands is networking, where it's not uncommon to have tons of sockets open and polled for. The current implementation uses a list for insertion and lookup, which works fine for file based use cases where the count is usually low, it breaks down somewhat for higher number of files / sockets. A test case with 30k sockets being polled for and cancelled takes: real 0m6.968s user 0m0.002s sys 0m6.936s with the patch it takes: real 0m0.233s user 0m0.010s sys 0m0.176s If you go to 50k sockets, it gets even more abysmal with the current code: real 0m40.602s user 0m0.010s sys 0m40.555s with the patch it takes: real 0m0.398s user 0m0.000s sys 0m0.341s Change is pretty straight forward, just replace the cancel_list with a red/black tree instead. Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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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.