[PATCH] use total_highpages when calculating lowmem-only allocation sizes

[Jan Beulich]

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

vfs_caches_init() should really also be called with a lowmem-only
value, but since it does arithmetic involving nr_free_pages() and there
is no nr_free_high_pages(), it's not clear how to make this work.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

---
 init/main.c                       |    3 ++-
 net/dccp/proto.c                  |    8 +++++---
 net/decnet/dn_route.c             |    3 ++-
 net/netfilter/nf_conntrack_core.c |    7 +++++--
 net/netlink/af_netlink.c          |    8 +++++---
 net/sctp/protocol.c               |    6 +++---
 6 files changed, 22 insertions(+), 13 deletions(-)

--- linux-2.6.36-rc3/init/main.c
+++ 2.6.36-rc3-use-totalhigh_pages/init/main.c
@@ -23,6 +23,7 @@
 #include <linux/smp_lock.h>
 #include <linux/initrd.h>
 #include <linux/bootmem.h>
+#include <linux/highmem.h>
 #include <linux/acpi.h>
 #include <linux/tty.h>
 #include <linux/percpu.h>
@@ -676,7 +677,7 @@ asmlinkage void __init start_kernel(void
 #endif
 	thread_info_cache_init();
 	cred_init();
-	fork_init(totalram_pages);
+	fork_init(totalram_pages - totalhigh_pages);
 	proc_caches_init();
 	buffer_init();
 	key_init();
--- linux-2.6.36-rc3/net/dccp/proto.c
+++ 2.6.36-rc3-use-totalhigh_pages/net/dccp/proto.c
@@ -14,6 +14,7 @@
 #include <linux/types.h>
 #include <linux/sched.h>
 #include <linux/kernel.h>
+#include <linux/highmem.h>
 #include <linux/skbuff.h>
 #include <linux/netdevice.h>
 #include <linux/in.h>
@@ -1049,10 +1050,11 @@ static int __init dccp_init(void)
 	 *
 	 * The methodology is similar to that of the buffer cache.
 	 */
-	if (totalram_pages >= (128 * 1024))
-		goal = totalram_pages >> (21 - PAGE_SHIFT);
+	goal = totalram_pages - totalhigh_pages;
+	if (goal >= (128 * 1024))
+		goal >>= 21 - PAGE_SHIFT;
 	else
-		goal = totalram_pages >> (23 - PAGE_SHIFT);
+		goal >>= 23 - PAGE_SHIFT;
 
 	if (thash_entries)
 		goal = (thash_entries *
--- linux-2.6.36-rc3/net/decnet/dn_route.c
+++ 2.6.36-rc3-use-totalhigh_pages/net/decnet/dn_route.c
@@ -69,6 +69,7 @@
 #include <linux/slab.h>
 #include <net/sock.h>
 #include <linux/mm.h>
+#include <linux/highmem.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/init.h>
@@ -1762,7 +1763,7 @@ void __init dn_route_init(void)
 	dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
 	add_timer(&dn_route_timer);
 
-	goal = totalram_pages >> (26 - PAGE_SHIFT);
+	goal = (totalram_pages - totalhigh_pages) >> (26 - PAGE_SHIFT);
 
 	for(order = 0; (1UL << order) < goal; order++)
 		/* NOTHING */;
--- linux-2.6.36-rc3/net/netfilter/nf_conntrack_core.c
+++ 2.6.36-rc3-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>
@@ -1346,10 +1347,12 @@ 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;
--- linux-2.6.36-rc3/net/netlink/af_netlink.c
+++ 2.6.36-rc3-use-totalhigh_pages/net/netlink/af_netlink.c
@@ -30,6 +30,7 @@
 #include <linux/sched.h>
 #include <linux/errno.h>
 #include <linux/string.h>
+#include <linux/highmem.h>
 #include <linux/stat.h>
 #include <linux/socket.h>
 #include <linux/un.h>
@@ -2124,10 +2125,11 @@ static int __init netlink_proto_init(voi
 	if (!nl_table)
 		goto panic;
 
-	if (totalram_pages >= (128 * 1024))
-		limit = totalram_pages >> (21 - PAGE_SHIFT);
+	limit = totalram_pages - totalhigh_pages;
+	if (limit >= (128 * 1024))
+		limit >>= 21 - PAGE_SHIFT;
 	else
-		limit = totalram_pages >> (23 - PAGE_SHIFT);
+		limit >>= 23 - PAGE_SHIFT;
 
 	order = get_bitmask_order(limit) - 1 + PAGE_SHIFT;
 	limit = (1UL << order) / sizeof(struct hlist_head);
--- linux-2.6.36-rc3/net/sctp/protocol.c
+++ 2.6.36-rc3-use-totalhigh_pages/net/sctp/protocol.c
@@ -1189,10 +1189,10 @@ SCTP_STATIC __init int sctp_init(void)
 	/* Size and allocate the association hash table.
 	 * The methodology is similar to that of the tcp hash tables.
 	 */
-	if (totalram_pages >= (128 * 1024))
-		goal = totalram_pages >> (22 - PAGE_SHIFT);
+	if (nr_pages >= (128 * 1024))
+		goal = nr_pages >> (22 - PAGE_SHIFT);
 	else
-		goal = totalram_pages >> (24 - PAGE_SHIFT);
+		goal = nr_pages >> (24 - PAGE_SHIFT);
 
 	for (order = 0; (1UL << order) < goal; order++)
 		;


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