Re: [PATCH mm 1/2] kfence: add option to use KFENCE without static keys

[Jörn Engel]

On Mon, Jan 11, 2021 at 10:15:43AM +0100, Marco Elver wrote:
> For certain usecases, specifically where the sample interval is always
> set to a very low value such as 1ms, it can make sense to use a dynamic
> branch instead of static branches due to the overhead of toggling a
> static branch.

I ended up with 100µs and couldn't measure a performance problem in our
benchmarks.  My results don't have predictive value for anyone else, of
course.

> Therefore, add a new Kconfig option to remove the static branches and
> instead check kfence_allocation_gate if a KFENCE allocation should be
> set up.
> 
> Suggested-by: Jörn Engel <joern@xxxxxxxxxxxxxxx>
> Signed-off-by: Marco Elver <elver@xxxxxxxxxx>

Reviewed-by: Jörn Engel <joern@xxxxxxxxxxxxxxx>

Jörn

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One of the things I’ve discovered over the years, is that you can
create change or you can receive credit – not both.
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