Re: [RFC PATCH 00/12] mm: mirrored memory support for page buddy allocations
From: Xishi Qiu
Date: Wed Jun 17 2015 - 21:23:46 EST
On 2015/6/16 17:46, Vlastimil Babka wrote:
> On 06/16/2015 10:17 AM, Xishi Qiu wrote:
>> On 2015/6/16 15:53, Vlastimil Babka wrote:
>>> On 06/04/2015 02:54 PM, Xishi Qiu wrote:
>>>> I think add a new migratetype is btter and easier than a new zone, so I use
>>> If the mirrored memory is in a single reasonably compact (no large holes) range
>>> (per NUMA node) and won't dynamically change its size, then zone might be a
>>> better option. For one thing, it will still allow distinguishing movable and
>>> unmovable allocations within the mirrored memory.
>>> We had enough fun with MIGRATE_CMA and all kinds of checks it added to allocator
>>> hot paths, and even CMA is now considering moving to a separate zone.
>> Hi, how about the problem of this case:
>> e.g. node 0: 0-4G(dma and dma32)
>> node 1: 4G-8G(normal), 8-12G(mirror), 12-16G(normal),
>> so more than one normal zone in a node? or normal zone just span the mirror zone?
> Normal zone can span the mirror zone just fine. However, it will result in zone
> scanners such as compaction to skip over the mirror zone inefficiently. Hmm...
If there are many mirror regions in one node, then it will be many holes in the
normal zone, is this fine?
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/