Re: [mm][RFC][PATCH 0/11] mm accessor updates.

From: Avi Kivity
Date: Fri Dec 18 2009 - 12:01:09 EST

On 12/18/2009 07:17 AM, Ingo Molnar wrote:

It is not about naming. The accessors hide the locking mechanism for
mmap_sem. Then you can change the locking in a central place.

The locking may even become configurable later. Maybe an embedded solution
will want the existing scheme but dual quad socket may want a distributed
reference counter to avoid bouncing cachelines on faults.
Hiding the locking is pretty much the worst design decision one can make.

It does allow incremental updates. For example if we go with range locks, the accessor turns into a range lock of the entire address space; users can be converted one by one to use their true ranges in order of importance.

I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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