Re: [PATCH v2] Make transparent hugepages cpuset aware

From: David Rientjes
Date: Tue Jun 11 2013 - 18:20:24 EST

On Tue, 11 Jun 2013, Alex Thorlton wrote:

> This patch adds the ability to control THPs on a per cpuset basis. Please see
> the additions to Documentation/cgroups/cpusets.txt for more information.

What's missing from both this changelog and the documentation you point to
is why this change is needed.

I can understand how you would want a subset of processes to not use thp
when it is enabled. This is typically where MADV_NOHUGEPAGE is used with
some type of malloc hook.

I don't think we need to do this on a cpuset level, so unfortunately I
think this needs to be reworked. Would it make sense to add a per-process
tunable to always get MADV_NOHUGEPAGE behavior for all of its sbrk() and
mmap() calls? Perhaps, but then you would need to justify why it can't be
done with a malloc hook in userspace.

This seems to just be working around a userspace issue or for a matter of
convenience, right?
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