[lkml]   [2005]   [Feb]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC][PATCH] Sparse Memory Handling (hot-add foundation)
On Fri, 2005-02-18 at 11:04 +0100, Andi Kleen wrote:
> Dave Hansen <> writes:
> > The attached patch, largely written by Andy Whitcroft, implements a
> > feature which is similar to DISCONTIGMEM, but has some added features.
> > Instead of splitting up the mem_map for each NUMA node, this splits it
> > up into areas that represent fixed blocks of memory. This allows
> > individual pieces of that memory to be easily added and removed.
> I'm curious - how does this affect .text size for a i386 or x86-64 NUMA
> kernel? One area I wanted to improve on x86-64 for a long time was
> to shrink the big virt_to_page() etc. inline macros. Your new code
> actually looks a bit smaller.

On x86, it looks like a 3k increase in text size. I know Matt Tolentino
has been testing it on x86_64, he might have a comparison there for you.

$ size i386-T41-laptop*/vmlinux
text data bss dec hex filename
2897131 580592 204252 3681975 382eb7 i386-T41-laptop.sparse/vmlinux
2894166 581832 203228 3679226 3823fa i386-T41-laptop/vmlinux

BTW, this PAE is on and uses 36-bits of physaddr space.

-- Dave

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 14:10    [W:0.045 / U:24.752 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site