Re: [PATCH 2/3] mm: make the threshold of enabling THP configurable

[Cong Wang]

ä 2011å06æ22æ 17:16, Mel Gorman åé:
> What I meant was that there is a rational reason why 512M is the
> default for enabling THP by default. Tuning it lower than that by any
> means makes very little sense. Tuning it higher might make some sense
> but it is more likely that THP would simply be disabled via sysctl. I
> see very little advantage to introducing this Kconfig option other
> than as a source of confusion when running make oldconfig.

The tunable range is (512, 8192), so 512M is the minimum.

Sure, I knew it can be disabled via /sys, actually we can do even
more in user-space, that is totally move the 512M check out of kernel,
why we didn't?

In short, I think we should either remove the 512M from kernel, or
make 512M to be tunable.

Thanks.
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