On 2016/2/1 21:53, Mel Gorman wrote:
> On Fri, Jan 29, 2016 at 10:03:52PM +0100, Vlastimil Babka wrote:
>>> Since the root cause is that fallbacks might frequently split order-2
>>> and order-3 pages of the other migration types. This patch tweaks
>>> fallback mechanism to avoid splitting order-2
On Fri, Jan 29, 2016 at 10:03:52PM +0100, Vlastimil Babka wrote:
> > Since the root cause is that fallbacks might frequently split order-2
> > and order-3 pages of the other migration types. This patch tweaks
> > fallback mechanism to avoid splitting order-2 and order-3 pages. while
> > fallbacks h
On 2016/1/30 5:03, Vlastimil Babka wrote:
> On 01/29/2016 08:23 PM, ChengYi He wrote:
>
> [...]
>
>> Below is the root cause of this external fragmentation which could be
>> observed in devices which have only one memory zone, such as some arm64
>> android devices:
>>
>> 1) In arm64, the first 4
On 01/29/2016 08:23 PM, ChengYi He wrote:
[...]
> Below is the root cause of this external fragmentation which could be
> observed in devices which have only one memory zone, such as some arm64
> android devices:
>
> 1) In arm64, the first 4GB physical address space is of DMA zone. If the
> size
The patchset tries to avoid external fragmentation related to migration
fallback. The symptom of this external fragmentation is that there are
lots of allocation failures of order-2 and order-3 pages and many
threads enter allocation slowpath to compact and direct reclaim pages.
This will degrade s
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