On Wed, Dec 30, 2015 at 12:02 AM, Bob Liu <bob.liu@xxxxxxxxxx> wrote: > Hi Ross, > > On 12/24/2015 03:39 AM, Ross Zwisler wrote: >> Add support for tracking dirty DAX entries in the struct address_space >> radix tree. This tree is already used for dirty page writeback, and it >> already supports the use of exceptional (non struct page*) entries. >> >> In order to properly track dirty DAX pages we will insert new exceptional >> entries into the radix tree that represent dirty DAX PTE or PMD pages. > > I may get it wrong, but there is "struct page" for persistent memory after > "[PATCH v4 00/18]get_user_pages() for dax pte and pmd mappings". > So why not just add "struct page" to radix tree directly just like normal page cache? > > Then we don't need to deal with any exceptional entries and special writeback. That "struct page" is optional and fsync/msync needs to operate in its absence. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
