Hi Ben, On Thu, Sep 16, 2010 at 08:04:24PM +1000, Benjamin Herrenschmidt wrote: > On Thu, 2010-09-16 at 10:53 +0530, Ankita Garg wrote: > > > > With some debugging I found that that section has reserved pages. On > > instrumenting the memblock_reserve() and reserve_bootmem() routines, I can see > > that many of the memory areas are reserved for kernel and initrd by the > > memblock reserve() itself. reserve_bootmem then looks at the pages already > > reserved and marks them reserved. However, for the very last section, I see > > that bootmem reserves it but I am unable to find a corresponding reservation > > by the memblock code. > > It's probably RTAS (firmware runtime services). I'ts instanciated at > boot from prom_init and we do favor high addresses for it below 1G iirc. > Thanks Ben for taking a look at this. So I checked the rtas messages on the serial console and see the following: instantiating rtas at 0x000000000f632000... done Which does not correspond to the higher addresses that I see as reserved (observation on a 16G machine). -- Regards, Ankita Garg (ankita@xxxxxxxxxx) Linux Technology Center IBM India Systems & Technology Labs, Bangalore, India -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>