lkml.org 
[lkml]   [2006]   [Feb]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] remove zone_mem_map
On Wed, 22 Feb 2006, KAMEZAWA Hiroyuki wrote:

> This patch removes zone_mem_map.

Note that IA64 does not seem to depend on zone_mem_map...

> Index: test/include/asm-generic/memory_model.h
> ===================================================================
> --- test.orig/include/asm-generic/memory_model.h
> +++ test/include/asm-generic/memory_model.h
> @@ -47,9 +47,9 @@ extern unsigned long page_to_pfn(struct
>
> #define page_to_pfn(pg) \
> ({ struct page *__pg = (pg); \
> - struct zone *__zone = page_zone(__pg); \
> - (unsigned long)(__pg - __zone->zone_mem_map) + \
> - __zone->zone_start_pfn; \
> + struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg)); \
> + (unsigned long)(__pg - __pgdat->node_mem_map) + \
> + __pgdat->node_start_pfn; \
> })

NODE_DATA is an arch specific lookup, If it always is a table lookup
then the performance will be comparable to page_zone because that also
involves one table lookup.
-
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: 2006-02-22 04:07    [W:0.069 / U:0.648 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site