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authorTim Bird <tim.bird@am.sony.com>2012-05-23 13:33:35 +0000
committerDavid S. Miller <davem@davemloft.net>2012-05-24 00:28:21 -0400
commit31fe62b9586643953f0c0c37a6357dafc69034e2 (patch)
tree69f9990423969df4ecbaea9d1e8de748284bea5e /net/ipv4/udp.c
parentd0a24a3516fb36023bef28d2355fa34e7f32029f (diff)
mm: add a low limit to alloc_large_system_hash
UDP stack needs a minimum hash size value for proper operation and also uses alloc_large_system_hash() for proper NUMA distribution of its hash tables and automatic sizing depending on available system memory. On some low memory situations, udp_table_init() must ignore the alloc_large_system_hash() result and reallocs a bigger memory area. As we cannot easily free old hash table, we leak it and kmemleak can issue a warning. This patch adds a low limit parameter to alloc_large_system_hash() to solve this problem. We then specify UDP_HTABLE_SIZE_MIN for UDP/UDPLite hash table allocation. Reported-by: Mark Asselstine <mark.asselstine@windriver.com> Reported-by: Tim Bird <tim.bird@am.sony.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp.c')
-rw-r--r--net/ipv4/udp.c30
1 files changed, 10 insertions, 20 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 609397ee78fb..eaca73644e79 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2192,26 +2192,16 @@ void __init udp_table_init(struct udp_table *table, const char *name)
{
unsigned int i;
- if (!CONFIG_BASE_SMALL)
- table->hash = alloc_large_system_hash(name,
- 2 * sizeof(struct udp_hslot),
- uhash_entries,
- 21, /* one slot per 2 MB */
- 0,
- &table->log,
- &table->mask,
- 64 * 1024);
- /*
- * Make sure hash table has the minimum size
- */
- if (CONFIG_BASE_SMALL || table->mask < UDP_HTABLE_SIZE_MIN - 1) {
- table->hash = kmalloc(UDP_HTABLE_SIZE_MIN *
- 2 * sizeof(struct udp_hslot), GFP_KERNEL);
- if (!table->hash)
- panic(name);
- table->log = ilog2(UDP_HTABLE_SIZE_MIN);
- table->mask = UDP_HTABLE_SIZE_MIN - 1;
- }
+ table->hash = alloc_large_system_hash(name,
+ 2 * sizeof(struct udp_hslot),
+ uhash_entries,
+ 21, /* one slot per 2 MB */
+ 0,
+ &table->log,
+ &table->mask,
+ UDP_HTABLE_SIZE_MIN,
+ 64 * 1024);
+
table->hash2 = table->hash + (table->mask + 1);
for (i = 0; i <= table->mask; i++) {
INIT_HLIST_NULLS_HEAD(&table->hash[i].head, i);