在 2020/7/10 下午6:33, Kirill A. Shutemov 写道: > On Fri, Jul 10, 2020 at 12:51:58PM +0800, Alex Shi wrote: >> >> >> 在 2020/7/10 上午12:07, Kirill A. Shutemov 写道: >>> Right, and it's never got removed from LRU during the split. The tail >>> pages have to be added to LRU because they now separate from the tail >>> page. >>> >> According to the explaination, looks like we could remove the code path, >> since it's never got into. (base on my v15 patchset). Any comments? > > Yes. But why? It's reasonable failsafe that gives chance to recover if > something goes wrong. > Hi Kirill, Sorry, I didn't get your points. IMHO, this fallback cann't work well, since the head page isn't and shouldn't be added to lru. like the iommu issue if a dma page added into lru list, it may be reclaim and lost. So, sorry, I still don't know how this path could fix some wrong. Thanks Alex
