Re: lazy_buddy-2.5.25-1

[William Lee Irwin III <wli@holomorphy.com>]

On Wed, Jul 10, 2002 at 01:59:17AM -0700, William Lee Irwin III wrote:
> This patch implements deferred coalescing for the Linux page-level
> allocator, or the lazy buddy algorithm. This appears to reduce the
> allocator overhead in some AF_UNIX and local TCP connection scenarios
> according to LMbench (hopefully I can follow up with numbers soon).
> This is a simple forward port of the 2.5.23-based version decoupled
> from some of the cleanups previously bundled with it.

Ugh, forward port breakage. Ran into this in a different patch but
realized it was broken here too. Sorry folks. You'll need this on
top of the prior post.


Cheers,
Bill


===== mm/page_alloc.c 1.125 vs edited =====
--- 1.125/mm/page_alloc.c	Tue Jul  9 14:50:43 2002
+++ edited/mm/page_alloc.c	Wed Jul 10 20:33:03 2002
@@ -312,7 +312,6 @@
 
 			if (bad_range(zone, page))
 				BUG();
-			prep_new_page(page);
 			return page;	
 		}
 		curr_order++;
@@ -394,7 +393,7 @@
 		page = buddy_alloc(zone, order);
 	if (unlikely(!page))
 		goto out;
-	set_page_count(page, 1);
+	prep_new_page(page);
 	area->active++;
 	zone->free_pages -= 1UL << order;
 out: