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mm: add a low limit to alloc_large_system_hash

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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 <[email protected]>
Reported-by: Tim Bird <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Tim Bird 2012-05-23 13:33:35 +00:00 • committed by David S. Miller
commit 31fe62b958
8 changed files with 26 additions and 24 deletions
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3
kernel/pid.c
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@ -547,7 +547,8 @@ void __init pidhash_init(void)
pid_hash = alloc_large_system_hash("PID", sizeof(*pid_hash), 0, 18,
HASH_EARLY | HASH_SMALL,
&pidhash_shift, NULL, 4096);
&pidhash_shift, NULL,
0, 4096);
pidhash_size = 1U << pidhash_shift;
for (i = 0; i < pidhash_size; i++)