On Thu, 12 Jun 2008 09:58:38 +1000 Nick Piggin <nickpiggin@xxxxxxxxxxxx> wrote: > > Does loopback over tmpfs use a different allocation path? > > I'm sorry, hmm I didn't look closely enough and forgot that > write_begin/write_end requires the callee to allocate the page > as well, and that Hugh had nicely unified most of that. > > So maybe it's not that. It's pretty easy to hit I found with > ext2 mounted over loopback on a tmpfs file. Turns out the loopback driver uses splice, which moves the pages from one place to another. This is why you were seeing the problem with loopback, but not with just a really big file on tmpfs. I'm trying to make sense of all the splice code now and will send fix as soon as I know how to fix this problem in a nice way. -- All Rights Reversed -- To unsubscribe from this list: send the line "unsubscribe kernel-testers" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
