On 11/2/18 1:41 PM, Marinko Catovic wrote: >>>> any idea how to find out what that might be? I'd really have no idea, >>>> I also wonder why this never was an issue with 3.x >>>> find uses regex patterns, that's the only thing that may be unusual. >>> >>> The allocation tracepoint has the stack trace so that might help. This >> >> Well we already checked the mm_page_alloc traces and it seemed that only >> THP allocations could be the culprit. But apparently defrag=defer made >> no difference. I would still recommend it so we can see the effects on >> the traces. And adding tracepoints >> compaction/mm_compaction_try_to_compact_pages and >> compaction/mm_compaction_suitable as I suggested should show which >> high-order allocations actually invoke the compaction. > > Anything in particular I should do to figure this out? Setup the same monitoring as before, but with two additional tracepoints (echo 1 > .../enable) and once the problem appears, provide the tracing output.
