2011/10/4 Samuel Thibault <samuel.thiba...@gnu.org>: > Sergio López, le Tue 04 Oct 2011 09:54:55 +0200, a écrit : >> In objects where copy attribute is MEMORY_OBJECT_COPY_DELAY, for every >> read operation (usually done with vm_copy) all pages in the source >> object are write protected to be able to use copy-on-write >> optimizations. The cost for this operation seems to be higher than >> actually copying the pages for objects larger than just a bunch of >> pages. Moreover, this CoW optimization is lost for requests larger >> than 2k, since MiG stubs copy (with a conventional memcpy) the data >> from the buffer received in the message, to the actual address >> expected by the client. > > I see. I guess it'll be the same for other FSes, and maybe > storeio/pager.c too? Could you send a patch so that you show up as > author of the change?
Sure, but I think applying this changes on all translators could be dangerous. I've just tested ext2fs, I don't know if there could be some side effects for other servers.
