On Fri, 2007-10-26 at 18:00 +1000, Benjamin Herrenschmidt wrote: > > > Interesting. That means I don't need to have a PTE page to be a struct > > > page anymore ? I can have good use for that on powerpc as well... > > > > That would be good news. I'm curious, can you elaborate on what the use > > case is? > > When using 64K pages, we use 32K of PTEs and 32K of "extension". The > extension thing is used when using HW 4K pages, to keep track of the > subpages. On setups where that isn't needed, we can save memory by > allocating half pages... Ahh, that is exactly the same reason as for s390. Page tables with a size that is sub-page. -- blue skies, Martin. "Reality continues to ruin my life." - Calvin. - To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
