On Tue, Jan 24, 2017 at 3:12 AM, Jan Kara <jack@xxxxxxx> wrote: > On Mon 23-01-17 16:47:18, Dave Jiang wrote: >> The following series implements support for 1G trasparent hugepage on >> x86 for device dax. The bulk of the code was written by Mathew Wilcox >> a while back supporting transparent 1G hugepage for fs DAX. I have >> forward ported the relevant bits to 4.10-rc. The current submission has >> only the necessary code to support device DAX. > > Well, you should really explain why do we want this functionality... Is > anybody going to use it? Why would he want to and what will he gain by > doing so? Because so far I haven't heard of a convincing usecase. > So the motivation and intended user of this functionality mirrors the motivation and users of 1GB page support in hugetlbfs. Given expected capacities of persistent memory devices an in-memory database may want to reduce tlb pressure beyond what they can already achieve with 2MB mappings of a device-dax file. We have customer feedback to that effect as Willy mentioned in his previous version of these patches [1]. [1]: https://lkml.org/lkml/2016/1/31/52 -- 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>
