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SubjectRe: [PATCH v2] mm: add a low limit to alloc_large_system_hash
From: Eric Dumazet <>
Date: Mon, 27 Feb 2012 07:03:17 +0100

> 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 <>
> Reported-by: Tim Bird <>
> Signed-off-by: Eric Dumazet <>

Acked-by: David S. Miller <>

Who wants to take this?

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