[-mm PATCH] Memory controller improve user interface

Dave Hansen haveblue at us.ibm.com
Wed Aug 29 15:18:14 PDT 2007

On Thu, 2007-08-30 at 03:34 +0530, Balbir Singh wrote:
> I've thought about this before. The problem is that a user could
> set his limit to 10000 bytes, but would then see the usage and
> limit round to the closest page boundary. This can be confusing
> to a user. 

True, but we're lying if we allow a user to set their limit there,
because we can't actually enforce a limit at 8,192 bytes vs 10,000.
They're the same limit as far as the kernel is concerned.

Why not just -EINVAL if the value isn't page-aligned?  There are plenty
of interfaces in the kernel that require userspace to know the page
size, so this shouldn't be too difficult.

-- Dave

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