On Thu, Jan 07, 2016 at 04:36:44PM -0800, Douglas Anderson wrote: > This patch adds the DMA_ATTR_NOHUGEPAGE attribute to the DMA-mapping > subsystem. > > This attribute can be used as a hint to the DMA-mapping subsystem that > it's likely not worth it to try to allocation large pages behind the > scenes. Large pages are likely to make an IOMMU TLB work more > efficiently but may not be worth it. See the Documentation contained in > this patch for more details about this attribute and when to use it. > > Note that the name of the hint (DMA_ATTR_NOHUGEPAGE) is based on the > name MADV_NOHUGEPAGE, which has the same meaning. If we have expected > users, we could also add MADV_HUGEPAGE which has the opposite meaning of > this hint. A user of this features seems to be missing in the series. Please don't add any clutter with unclear usage to the kernel unless there is a real need which can be deonstrated in form of patches and numbers. -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
