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When using option -a without --prod-affinity or --cons-affinity, if the number of producers and consumers is greater than the number of online CPUs, the benchmark will fail to run as shown below: $ getconf _NPROCESSORS_ONLN 8 $ ./bench bpf-loop -a -p9 Setting up benchmark 'bpf-loop'... setting affinity to CPU #8 failed: -22 Fix it by returning the remainder of next_cpu divided by the number of online CPUs in next_cpu(). Signed-off-by: Hou Tao <houtao1@huawei.com> Link: https://lore.kernel.org/r/20230613080921.1623219-4-houtao@huaweicloud.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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.