lkml.org 
[lkml]   [2006]   [Dec]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [RFC] [PATCH] virtual memmap on sparsemem v3 [0/4] introduction
Hiroyuki KAMEZAWA wrote:	[Fri Dec 08 2006, 01:56:08AM EST]
Hi Kame,
> Hi, virtual mem_map on sparsemem/generic patch version 3.
>
> I myself likes this patch.
> But someone may feels this patch is intrusive and scattered.
> please pointing out.
>
> Changes v2 -> v3
> - make map/unmap function for general purpose. (for my purpose ;)
> - drop memory hotplug support. will be posted after this goes in.
> - change pfn_to_page()/page_to_pfn() defintions.
> - add CONFIT_SPARSEMEM_VMEMMAP_STATIC config.
> - several clean ups.
> - drop optimized pfn_valid() patch will be posted later after this goes in.
> - add #error to check vmem_map alignment.
>
> Changes v1 -> v2:
> - support memory hotplug case.
> - uses static address for vmem_map (ia64)
> - added optimized pfn_valid() for ia64 (experimental)
>
> Intro:
> When using SPARSEMEM, pfn_to_page()/page_to_pfn() accesses global big table
> of mem_section. if SPARSEMEM_EXTREME, this is 2-level table lookup.
Did you gather any performance numbers comparing
VIRTUAL_MEM_MAP+SPARSEMEM to SPARSEMEM+EXTREME? I did some quick but
inconclusive (small machine) ones when you first posted. There was
perhaps a slight degradation in VIRTUAL_MEM_MAP+SPARSEMEM.

bob
>
> If we can map mem_section->mem_map in (virtually) linear address, we can expect
> optimzed pfn <-> page translation.
>
> Virtual mem_map is not useful for 32bit archs. This uses huge virtual
> address range.
>
> -Kame
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-12-10 20:51    [W:0.095 / U:1.316 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site