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| author | Tim Bird <tim.bird@am.sony.com> | 2012-05-23 13:33:35 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-05-24 00:28:21 -0400 |
| commit | 31fe62b9586643953f0c0c37a6357dafc69034e2 (patch) | |
| tree | 69f9990423969df4ecbaea9d1e8de748284bea5e /net/ipv4/udp.c | |
| parent | d0a24a3516fb36023bef28d2355fa34e7f32029f (diff) | |
| download | linux-stable-31fe62b9586643953f0c0c37a6357dafc69034e2.tar.gz linux-stable-31fe62b9586643953f0c0c37a6357dafc69034e2.tar.bz2 linux-stable-31fe62b9586643953f0c0c37a6357dafc69034e2.zip | |
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.c | 30 |
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); |