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? Samuel
