On Wed, Feb 13, 2019 at 05:47:56PM +0000, Mel Gorman wrote: > If there is a tangiable performance benefit from using contiguous regions > then I would suggest optimistically allocating them with appropriate > GFP flags to avoid large latencies at startup time and fall back if > necessary.
Right; the code does the fallback thing. It successively tries smaller order allocations until 0-order fails. It currently uses: #define PERF_AUX_GFP (GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY) Is that what you could consider appropriate?
