On Mon, 29. Jul 09:48, Baoquan He wrote: [...] > Hi Hailong, > > Please feel free to collect them to post formal patch, maybe two > patches, one is to allow non-nofail to fallback to order-0 in > vm_area_alloc_pages(), the other is passing out the fallbacked > page_order to vmap_pages_range() if it's OK. Sorry for late response. I personally prefer to revert part of the problematic patch. There are several reasons: - Save memory usage if high order allocation failed. - If nofail and fallback to order0 in vmalloc huge allocation, actually the allocation is alighed with PMD_SIZE or not PAGE_SHIFT. You might be concerned about performance issues. But IMO, - If we fallback to order0, we can make use of bulk allocator. - Maybe we can remove VM_ALLOW_HUGE_VMAP in kvmalloc. I am not sure if I have misunderstood anything. If I have, please let me know. > > Thanks > Baoquan > > -- help you, help me, Hailong.
