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SubjectRe: [PATCH] x86/entry/64: randomize kernel stack offset upon syscall

* Reshetova, Elena <elena.reshetova@intel.com> wrote:

> CONFIG_PAGE_TABLE_ISOLATION=n:
>
> base: Simple syscall: 0.0510 microseconds
> get_random_bytes(4096 bytes buffer): Simple syscall: 0.0597 microseconds
>
> So, pure speed wise get_random_bytes() with 1 page per-cpu buffer wins.

It still adds +17% overhead to the system call path, which is sad.
Why is it so expensive?

Thanks,

Ingo

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