Christoph Lameter wrote:
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...
Oh, yes. ia64 doesn't includes asm-generic/memory_model.h when DISCONTIGMEM.
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.
There are several types of NODE_DATA definitions.
1. #define NODE_DATA(node) (&node_data[node]) alpha,arm,
2. #define NODE_DATA(node) (node_data[node]) i386,powerpc,x86_64,m32r
3. #define NODE_DATA(node) (&node_data[node]->pgdat) parisc,mips
4. #define NODE_DATA(node) (per-cpu-page has node_data[nid] pointer array) ia64
BTW, ia64 looks very special. Does it make sensible performance gain ?
-- Kame
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
