On Wed, 2007-10-31 at 14:26 +1100, Nick Piggin wrote: > On Wednesday 31 October 2007 03:04, Peter Zijlstra wrote: > > Hi, > > > > Another posting of the full swap over NFS series. > > Hi, > > Is it really worth all the added complexity of making swap > over NFS files work, given that you could use a network block > device instead?
As it stands, we don't have a usable network block device IMHO. NFS is by far the most used and usable network storage solution out there, anybody with half a brain knows how to set it up and use it. > Also, have you ensured that page_file_index, page_file_mapping > and page_offset are only ever used on anonymous pages when the > page is locked? (otherwise PageSwapCache could change) Good point, I hope so, both ->readpage() and ->writepage() take a locked page, I'd have to look if it remains locked throughout the NFS call chain. Then again, it might become obsolete with the extended swap a_ops.
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