On 06/01/2014 10:24 PM, Naoya Horiguchi wrote: > Detail about the data format being passed to userspace are explained in > inline comment, but generally in long entry format, we can choose which > information is extraced flexibly, so you don't have to waste memory by > extracting unnecessary information. And with FINCORE_SKIP_HOLE flag, > we can skip hole pages (not on memory,) which makes us avoid a flood of > meaningless zero entries when calling on extremely large (but only few > pages of it are loaded on memory) file. Something similar could be useful for hugetlbfs too. For a 1GB page, it's pretty silly to do 2^18 entries which essentially repeat the same data in an interface like this. -- 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>