From: Christoph Lameter <cl@linux.com>
Date: Fri, 15 Apr 2011 19:48:15 +0000 (-0500)
Subject: slub: Move node determination out of hotpath
X-Git-Tag: firefly_0821_release~7613^2~1331^2^2~7
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=dc1fb7f43636754a4d06f7bdb8ea3269a7d71d6d;p=firefly-linux-kernel-4.4.55.git

slub: Move node determination out of hotpath

If the node does not change then there is no need to recalculate
the node from the page struct. So move the node determination
into the places where we acquire a new slab page.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---

diff --git a/mm/slub.c b/mm/slub.c
index ab44368ed692..301360bc00c6 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1828,7 +1828,6 @@ load_freelist:
 	c->freelist = get_freepointer(s, object);
 	page->inuse = page->objects;
 	page->freelist = NULL;
-	c->node = page_to_nid(page);
 
 unlock_out:
 	slab_unlock(page);
@@ -1845,8 +1844,10 @@ another_slab:
 new_slab:
 	page = get_partial(s, gfpflags, node);
 	if (page) {
-		c->page = page;
 		stat(s, ALLOC_FROM_PARTIAL);
+load_from_page:
+		c->node = page_to_nid(page);
+		c->page = page;
 		goto load_freelist;
 	}
 
@@ -1867,8 +1868,8 @@ new_slab:
 
 		slab_lock(page);
 		__SetPageSlubFrozen(page);
-		c->page = page;
-		goto load_freelist;
+
+		goto load_from_page;
 	}
 	if (!(gfpflags & __GFP_NOWARN) && printk_ratelimit())
 		slab_out_of_memory(s, gfpflags, node);