On Tue, Jan 17, 2017 at 09:25:33PM -0800, willy@xxxxxxxxxxxxxxxxxxxxxx wrote: > On Fri, Jan 13, 2017 at 05:20:08PM -0700, Ross Zwisler wrote: > > We still have a lot of work to do, though, and I'd like to propose a discussion > > around what features people would like to see enabled in the coming year as > > well as what what use cases their customers have that we might not be aware of. > > +1 to the discussion > > > - Jan suggested [2] that we could use the radix tree as a cache to service DAX > > faults without needing to call into the filesystem. Are there any issues > > with this approach, and should we move forward with it as an optimization? > > Ahem. I believe I proposed this at last year's LSFMM. And I sent > patches to start that work. And Dan blocked it. So I'm not terribly > amused to see somebody else given credit for the idea. > > It's not just an optimisation. It's also essential for supporting > filesystems which don't have block devices. I'm aware of at least two > customer demands for this in different domains. > > 1. Embedded uses with NOR flash > 2. Cloud/virt uses with multiple VMs on a single piece of hardware Yea, I didn't mean the full move to having PFNs in the tree, just using the sector number in the radix tree instead of calling into the filesystem. My apologies if you feel I didn't give you proper credit. -- 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>