[PATCH 2/2] mm/dax: Don't enable huge dax mapping by default

Michal Suchánek msuchanek at suse.de
Wed Mar 6 22:44:53 AEDT 2019

On Wed, 06 Mar 2019 14:47:33 +0530
"Aneesh Kumar K.V" <aneesh.kumar at linux.ibm.com> wrote:

> Dan Williams <dan.j.williams at intel.com> writes:
> > On Thu, Feb 28, 2019 at 1:40 AM Oliver <oohall at gmail.com> wrote:  
> >>
> >> On Thu, Feb 28, 2019 at 7:35 PM Aneesh Kumar K.V
> >> <aneesh.kumar at linux.ibm.com> wrote:  
> Also even if the user decided to not use THP, by
> echo "never" > transparent_hugepage/enabled , we should continue to map
> dax fault using huge page on platforms that can support huge pages.

Is this a good idea?

This knob is there for a reason. In some situations having huge pages
can severely impact performance of the system (due to host-guest
interaction or whatever) and the ability to really turn off all THP
would be important in those cases, right?



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