Re: [PATCH 1/3] mm: completely disable THP by transparent_hugepage=never

From: Rik van Riel
Date: Mon Jun 20 2011 - 12:56:30 EST

On 06/20/2011 12:50 PM, Andrea Arcangeli wrote:
On Tue, Jun 21, 2011 at 12:34:28AM +0800, Amerigo Wang wrote:
transparent_hugepage=never should mean to disable THP completely,
otherwise we don't have a way to disable THP completely.
The design is broken.

We want to allow people to boot with transparent_hugepage=never but to
still allow people to enable it later at runtime. Not sure why you
find it broken... Your patch is just crippling down the feature with
no gain. There is absolutely no gain to disallow root to enable THP
later at runtime with sysfs, root can enable it anyway by writing into

Unless you're root and you enable it, it's completely disabled, so I
don't see what you mean it's not completely disabled. Not even
khugepaged is started, try to grep of khugepaged...

Agreed, I don't really see the reason for these patches.

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