On Thu, Jan 20, 2011 at 10:11:27AM -0800, Dave Hansen wrote: > On Thu, 2011-01-20 at 18:01 +0000, Russell King - ARM Linux wrote: > > > The x86 version of show_mem() actually manages to do this without any > > > #ifdefs, and works for a ton of configuration options. It uses > > > pfn_valid() to tell whether it can touch a given pfn. > > > > x86 memory layout tends to be very simple as it expects memory to > > start at the beginning of every region described by a pgdat and extend > > in one contiguous block. I wish ARM was that simple. > > x86 memory layouts can be pretty funky and have been that way for a long > time. That's why we *have* to handle holes in x86's show_mem(). My > laptop even has a ~1GB hole in its ZONE_DMA32: If x86 is soo funky, I suggest you try the x86 version of show_mem() on an ARM platform with memory holes. Make sure you try it with sparsemem as well... -- 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/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>