From: Nick Piggin <nickpiggin@yahoo.com.au>
Date: Fri, 6 Jan 2006 08:11:13 +0000 (-0800)
Subject: [PATCH] mm: pfault optimisation
X-Git-Tag: v2.6.16-rc1~936^2~247
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=41e9b63b35b52cf918a4ffdb8d77862ab824aa8b;p=linux-2.6-omap-h63xx.git

[PATCH] mm: pfault optimisation

This atomic operation is superfluous: the pte will be added with the
referenced bit set, and the page will be referenced through this mapping after
the page fault handler returns anyway.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/mm/memory.c b/mm/memory.c
index d7ca7de10f4..7197f9bcd38 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1977,7 +1977,6 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
 			goto release;
 		inc_mm_counter(mm, anon_rss);
 		lru_cache_add_active(page);
-		SetPageReferenced(page);
 		page_add_new_anon_rmap(page, vma, address);
 	} else {
 		/* Map the ZERO_PAGE - vm_page_prot is readonly */