Dave Kleikamp: > On Wed, 2009-03-04 at 12:52 +0100, Goswin von Brederlow wrote: ::: > > By the way. If you mmap a file in fuse shared twice wouldn't the > > kernel share the physical pages. So the first access calls fuse and > > loads the data into memory, the second access would just get the same > > physical page mapped. Right? > > Right. Some of my comments were a result of not being clear on what J. > R. meant when he asked about the first mapping being to the lower file. > Both mmaps to the same file in fuse would access the same physical > pages. I didn't know how fuse implements mmap and sharing pages. Additionally there is no mmap code in deltafs.c. So I wrote "it is unclear how do you implment mmap". Now I am reading fuse (instead of deltafs.c) and begin understanding that fuse and deltafs work as you expected. But the implementation seems different a little to me. These two mappings are not sharing memory pages but keeping the latest contents by re-reading, do they? J. R. Okajima -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
