wireguard: allowedips: allocate nodes in kmem_cache
The previous commit moved from O(n) to O(1) for removal, but in the process introduced an additional pointer member to a struct that increased the size from 60 to 68 bytes, putting nodes in the 128-byte slab. With deployed systems having as many as 2 million nodes, this represents a significant doubling in memory usage (128 MiB -> 256 MiB). Fix this by using our own kmem_cache, that's sized exactly right. This also makes wireguard's memory usage more transparent in tools like slabtop and /proc/slabinfo. Fixes: e7096c13 ("net: WireGuard secure network tunnel") Suggested-by:Arnd Bergmann <arnd@arndb.de> Suggested-by:
Matthew Wilcox <willy@infradead.org> Cc: stable@vger.kernel.org Signed-off-by:
Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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