On Wed, Dec 13, 2017 at 08:26:06PM +0800, Wei Wang wrote: > On 12/12/2017 09:20 PM, Tetsuo Handa wrote: > > Can you eliminate exception path and fold all xbitmap patches into one, and > > post only one xbitmap patch without virtio-baloon changes? If exception path > > is valuable, you can add exception path after minimum version is merged. > > This series is too difficult for me to close corner cases. > > That exception path is claimed to save memory, and I don't have a strong > reason to remove that part. > Matthew, could we get your feedback on this? Sure. This code is derived from the IDA code in lib/idr.c. Eventually, I intend to reunite them. For IDA, it clearly makes sense; the first 62 entries result in allocating no memory at all, which is going to be 99% of users. After that, we allocate 128 bytes which will serve the first 1024 users. The xbitmap, as used by Wei's patches here is going to be used somewhat differently from that. I understand why Tetsuo wants the exceptional path removed; I'm not sure the gains will be as important. But if we're going to rebuild the IDA on top of the xbitmap, we need to keep them. I really want to pay more attention to this, but I need to focus on getting the XArray finished. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
