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d87ae0fa21
This is the patch I'm using to evaluate the impact syscall user dispatch has on native syscall (syscalls not redirected to userspace) when enabled for the process and submiting syscalls though the unblocked dispatch selector. It works by running a step to define a baseline of the cost of executing sysinfo, then enabling SUD, and rerunning that step. On my test machine, an AMD Ryzen 5 1500X, I have the following results with the latest version of syscall user dispatch patches. root@olga:~# syscall_user_dispatch/sud_benchmark Calibrating test set to last ~5 seconds... test iterations = 37500000 Avg syscall time 134ns. Caught sys_ff00 trapped_call_count 1, native_call_count 0. Avg syscall time 147ns. Interception overhead: 9.7% (+13ns). Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Andy Lutomirski <luto@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20201127193238.821364-7-krisman@collabora.com
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.