On Sunday 05 August 2007 08:01, Evgeniy Polyakov wrote: > On Sun, Aug 05, 2007 at 01:06:58AM -0700, Daniel Phillips wrote: > > > DST original code worked as device mapper plugin too, but its two > > > additional allocations (io and clone) per block request ended up > > > for me as a show stopper. > > > > Ah, sorry, I misread. A show stopper in terms of efficiency, or in > > terms of deadlock? > > At least as in terms of efficiency. Device mapper lives in happy > world where memory does not end and allocations are fast. Are you saying that things are different for a network block device because it needs to do GFP_ATOMIC allocations? If so then that is just a misunderstanding. The global page reserve Peter and I use is available in interrupt context just like GFP_ATOMIC. Regards, Daniel - 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
