Re: [PATCH v2 2/4] mm: make the threshold of enabling THP configurable

[Cong Wang <amwang@redhat.com>]

ao? 2011a1'06ae??22ae?JPY 09:23, David Rientjes a??e??:
> On Tue, 21 Jun 2011, Amerigo Wang wrote:
>
>> Don't hard-code 512M as the threshold in kernel, make it configruable,
>> and set 512M by default.
>>
>> And print info when THP is disabled automatically on small systems.
>>
>> V2: Add more description in help messages, correct some typos,
>> print the mini threshold too.
>>
>
> I like the printk that notifies users why THP was disabled because it
> could potentially be a source of confusion (and fixing the existing typos
> in hugepage_init() would also be good).  However, I disagree that we need
> to have this as a config option: you either want the feature for your
> systems or you don't.  Perhaps add a "transparent_hugepage=force" option
> that will act as "always" but also force it to be enabled in all
> scenarios, even without X86_FEATURE_PSE, that will override all the logic
> that thinks it knows better?

I think that is overkill, because we can still enable THP via /sys
for small systems.

Thanks.

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