On 08/12/2013 04:13 PM, Benjamin Herrenschmidt wrote: > On Mon, 2013-08-12 at 08:01 -0500, Nathan Fontenot wrote: >>> Can you tell me a bit more, the above makes me nervous... >> >> Ok, I agree. that message isn't quite right. >> >> What I wanted to convey is that memory hotplug is not fully supported >> on powerpc with SPARSE_VMEMMAP enabled.. Perhaps the message should read >> "Memory hotplug is not fully supported for bootmem info nodes". >> >> Thoughts? > > Since SPARSE_VMEMMAP is our default and enabled in our distros, that mean > that memory hotplug isn't fully supported for us in general ? Actually... We have had the distros (at least SLES 11 and RHEL 6 releases) disable SPARSE_VMEMMAP in their releases. > > What do you mean by "not fully supported" ? What precisely is missing ? > What will happen if one tries to plug or unplug memory? I don't know everything that is missing, but there are several routines that need to be defined for power to support memory hotplug with SPARSE_VMEMMAP. > > Shouldn't we fix it ? Working on it, but it's not there yet. > > Cheers, > Ben. > > -- 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>