netdev - [PATCH] use total_highpages when calculating lowmem-only allocation sizes (netfilter)

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Date:	Mon, 06 Dec 2010 16:43:18 +0000
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	<netdev@...r.kernel.org>
Cc:	<akpm@...ux-foundation.org>
Subject: [PATCH] use total_highpages when calculating lowmem-only
	 allocation sizes (netfilter)

For those (large) table allocations that come only from lowmem, the
total amount of memory shouldn't really matter.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

---
 net/netfilter/nf_conntrack_core.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- linux-2.6.37-rc4/net/netfilter/nf_conntrack_core.c
+++ 2.6.37-rc4-use-totalhigh_pages/net/netfilter/nf_conntrack_core.c
@@ -17,6 +17,7 @@
 #include <linux/sched.h>
 #include <linux/skbuff.h>
 #include <linux/proc_fs.h>
+#include <linux/highmem.h>
 #include <linux/vmalloc.h>
 #include <linux/stddef.h>
 #include <linux/slab.h>
@@ -1398,10 +1399,12 @@ static int nf_conntrack_init_init_net(vo
 	/* Idea from tcp.c: use 1/16384 of memory.  On i386: 32MB
 	 * machine has 512 buckets. >= 1GB machines have 16384 buckets. */
 	if (!nf_conntrack_htable_size) {
+		unsigned long nr_pages = totalram_pages - totalhigh_pages;
+
 		nf_conntrack_htable_size
-			= (((totalram_pages << PAGE_SHIFT) / 16384)
+			= (((nr_pages << PAGE_SHIFT) / 16384)
 			   / sizeof(struct hlist_head));
-		if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE))
+		if (nr_pages > (1024 * 1024 * 1024 / PAGE_SIZE))
 			nf_conntrack_htable_size = 16384;
 		if (nf_conntrack_htable_size < 32)
 			nf_conntrack_htable_size = 32;



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