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Re: [PATCH v2 4/4] mm, compaction: direct freepage allocation for async direct compaction

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On 04/11/2016 09:13 AM, Joonsoo Kim wrote:
> On Thu, Mar 31, 2016 at 10:50:36AM +0200, Vlastimil Babka wrote:
>> The goal of direct compaction is to quickly make a high-order page available
>> for the pending allocation. The free page scanner can add significant latency
>> when searching for migration targets, although to succeed the compaction, the
>> only important limit on the target free pages is that they must not come from
>> the same order-aligned block as the migrated pages.
>
> If we fails migration, free pages will remain and they can interfere
> further compaction success because they doesn't come from previous
> order-aligned block but can come from next order-aligned block. You
> need to free remaining freelist after migration attempt fails?

Oh, good point, thanks!

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Re: [PATCH v2 4/4] mm, compaction: direct freepage allocation for  async direct compaction Joonsoo Kim <iamjoonsoo.kim@lge.com> - 2016-04-11 09:20 +0200
  Re: [PATCH v2 4/4] mm, compaction: direct freepage allocation for  async direct compaction Vlastimil Babka <vbabka@suse.cz> - 2016-04-11 09:30 +0200

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