On 2/3/2024 12:15 AM, Zi Yan wrote:
From: Zi Yan <ziy@xxxxxxxxxx> Hi all, This patchset enables >0 order folio memory compaction, which is one of the prerequisitions for large folio support[1]. It includes the fix[4] for V2 and is on top of mm-everything-2024-01-29-07-19. I am aware of that split free pages is necessary for folio migration in compaction, since if >0 order free pages are never split and no order-0 free page is scanned, compaction will end prematurely due to migration returns -ENOMEM. Free page split becomes a must instead of an optimization. lkp ncompare results for default LRU (-no-mglru) and CONFIG_LRU_GEN are shown at the bottom (on a 8-CPU (Intel Xeon E5-2650 v4 @ 2.20GHz) 16G VM). In sum, most of vm-scalability applications do not see performance change, and the others see ~4% to ~26% performance boost under default LRU and ~2% to ~6% performance boost under CONFIG_LRU_GEN.
For the whole series, looks good to me. And I did not find any regression after running thpcompact. So feel free to add:
Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> Tested-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
