Re: [PATCH 0/4] reintroduce compaction feedback for OOM decisions
From: Vlastimil Babka <hidden>
Date: 2016-09-22 15:18:55
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Subsystem:
memory management, memory management - core, memory management - mglru (multi-gen lru), memory management - page allocator, memory management - reclaim, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Vlastimil Babka, Johannes Weiner, Linus Torvalds
On 09/21/2016 07:18 PM, Michal Hocko wrote:
On Tue 06-09-16 15:52:54, Vlastimil Babka wrote: We still do not ignore fragindex in the full priority. This part has always been quite unclear to me so I cannot really tell whether that makes any difference or not but just to be on the safe side I would preffer to have _all_ the shortcuts out of the way in the highest priority. It is true that this will cause COMPACT_NOT_SUITABLE_ZONE so keep retrying but still a complication to understand the workflow. What do you think?
I was thinking that this shouldn't be a problem on non-costly orders and default extfrag_threshold. But better be safe. Moreover I think the issue is much more dangerous for compact_zonelist_suitable() as explained below. ----8<----