> "There are not so many free pages in a typical server system", sorry I don't > quite understand it. Linux tries to keep most memory in caches. As Linus says "free memory is bad memory" > > buffered_rmqueue() > prep_new_page() > check_new_page() > bad_page() > > If we alloc 2^10 pages and one of them is a poisoned page, then the whole 4M > memory will be dropped. prep_new_page() is only called on whatever is allocated. MAX_ORDER is much smaller than 2^10 If you allocate a large order page then yes the complete page is dropped. This is today generally true in hwpoison. It would be one possible area of improvement (probably mostly if 1GB pages become more common than they are today) It's usually not a problem because usually most allocations are small order and systems have generally very few memory errors, and even the largest MAX_ORDER pages are a small fraction of the total memory. If you lose larger amounts of memory usually you quickly hit something that HWPoison cannot handle. -Andi -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>