Re: [patch] mm, vmpressure: add high level

[Anton Vorontsov <anton@enomsg.org>]

Hello David,

On Wed, Oct 16, 2013 at 05:43:55PM -0700, David Rientjes wrote:
> Vmpressure has two important levels: medium and critical.  Medium is 
> defined at 60% and critical is defined at 95%.
> 
> We have a customer who needs a notification at a higher level than medium, 
> which is slight to moderate reclaim activity, and before critical to start 
> throttling incoming requests to save memory and avoid oom.
> 
> This patch adds the missing link: a high level defined at 80%.
> 
> In the future, it would probably be better to allow the user to specify an 
> integer ratio for the notification rather than relying on arbitrarily 
> specified levels.

Does the customer need to differentiate the two levels (medium and high),
or the customer only interested in this (80%) specific level?

In the latter case, instead of adding a new level I would vote for adding
a [sysfs] knob for modifying medium level's threshold.

Thanks,

Anton

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