linux-kernel - Re: [PATCH] Add nid sanity on alloc_pages

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Message-ID: <20070713121846.GA25236@joejin-pc.cn.oracle.com>
Date:	Fri, 13 Jul 2007 20:18:46 +0800
From:	Joe Jin <joe.jin@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Joe Jin <joe.jin@...cle.com>, bill.irwin@...cle.com,
	linux-kernel@...r.kernel.org, gurudas.pai@...cle.com,
	Paul Jackson <pj@....com>
Subject: Re: [PATCH] Add nid sanity on alloc_pages_node

> 
> Patch gone too ;) I deleted it.  I was hoping that you'd send me the final
> finished product (please).
> 

Ha.., the patch against 2.6.22, at your patch have use htlb_alloc_mask, but I
cannot found it at 2.6.22 kernel tree, I think you must use difference kernel
tree :)

Thanks,
Joe

--- linux-2.6.22/mm/hugetlb.c.orig	2007-07-12 15:02:19.000000000 +0800
+++ linux-2.6.22/mm/hugetlb.c	2007-07-13 17:33:45.000000000 +0800
@@ -101,13 +101,20 @@ static void free_huge_page(struct page *
 
 static int alloc_fresh_huge_page(void)
 {
-	static int nid = 0;
+	static int prev_nid;
 	struct page *page;
-	page = alloc_pages_node(nid, GFP_HIGHUSER|__GFP_COMP|__GFP_NOWARN,
-					HUGETLB_PAGE_ORDER);
-	nid = next_node(nid, node_online_map);
+	static DEFINE_SPINLOCK(nid_lock);
+	int nid;
+
+	spin_lock(&nid_lock);
+	nid = next_node(prev_nid, node_online_map);
 	if (nid == MAX_NUMNODES)
 		nid = first_node(node_online_map);
+	prev_nid = nid;
+	spin_unlock(&nid_lock);
+	
+	page = alloc_pages_node(nid, GFP_HIGHUSER|__GFP_COMP|__GFP_NOWARN,
+					HUGETLB_PAGE_ORDER);
 	if (page) {
 		set_compound_page_dtor(page, free_huge_page);
 		spin_lock(&hugetlb_lock);
-
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