On Fri, Oct 6, 2017 at 4:30 PM, Nicolas Pitre <nicolas.pitre@xxxxxxxxxx> wrote: > On Thu, 5 Oct 2017, Rob Herring wrote: > >> On kernels with a minimal config and a RAM target in the 100s of KB, DT >> is quite a hog of runtime memory usage. How much is dependent on how many >> nodes and properties in the DT which have a corresponding struct device_node >> and struct property in the kernel. Just skipping disabled nodes saves a >> lot by not creating the device_nodes in the first place[1], but there's >> more low hanging fruit by making some of the fields in struct property and >> struct device_node optional. With the changes here, the memory usage goes >> from 17KB to under 8KB on QEMU's ARM virt machine which is a relatively >> small DT. > > My test case went from 118072 bytes ddown to 21548 bytes with this > series. Did that include the changes for FDT skipping status=disabled and to stop storing the full path of every node? With those 2 alone you said it dropped to 25K. > Tested-by: Nicolas Pitre <nico@xxxxxxxxxx> Thanks. Rob -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
