On 23.12.22 10:35, Soichiro Ueda wrote:
At present, the VirtIO balloon device driver allocates pages one by one using alloc_page(), and frees them using put_page(). This changes it so that the driver allocates high order pages by using alloc_pages(), and frees them using __free_pages() if possible. By doing so, the CPU performance of inflation and deflation should be improved. The effect of this change has been confirmed by benchmarks that measure the elapsed time of inflation and deflation. The results are here: 16 pages inflation: before: 119,779 ns after : 115,655 ns (-3.4%) 64 pages inflation: before: 156,977 ns after : 150,961 ns (-3.8%) 256 pages inflation: before: 218,649 ns after : 208,490 ns (-4.6%) 16 pages deflation: before: 78,112 ns after : 68,288 ns (-12.6%) 64 pages deflation: before: 97,205 ns after : 80,491 ns (-17.194%) 256 pages deflation: before: 122,742 ns after : 107,526 ns (-12.4%)
How does this affect page migration / balloon compaction etc? -- Thanks, David / dhildenb
