Re: [RFC PATCH-tip v4 10/10] locking/rwsem: Add a boot parameter to reader spinning threshold

[Davidlohr Bueso]

On Thu, 18 Aug 2016, Waiman Long wrote:

> The default reader spining threshold is current set to 4096. However,
> the right reader spinning threshold may vary from one system to
> another and among the different architectures. This patch adds a new
> kernel boot parameter to modify the threshold value. This enables
> better tailoring to the needs of different systems as well as for
> testing purposes.

It also means that those systems could very easily be incorrectly tailored.
(and worse case scenario: reboot, is obviously a terrible way to get rid
of any issues). I very much disagree with exposing this sort of core stuff,
it should work well for everyone out of the box, not relying on users to
properly configure this.

Thanks,
Davidlohr
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