ZONE_DEVICE struct page != ZONE_NORMAL struct page in terms of write rate
ZONE_DEVICE struct page != ZONE_NORMAL struct page in terms of write rate
Posted Mar 24, 2017 0:15 UTC (Fri) by djbw (subscriber, #78104)In reply to: ZONE_DEVICE and the future of struct page by Cyberax
Parent article: ZONE_DEVICE and the future of struct page
I'm not convinced that's going to be a problem in practice. Consider that the bulk of what makes struct page a frequently accessed data structure is when it is used by the core mm for general purpose page allocations. The ZONE_DEVICE mechanism never releases these pages for that high frequency usage. Another mitigation is that struct page writes are buffered by the cpu cache, which further reduces the write rate to media.