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| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2021-06-04 17:17:37 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-06-04 14:25:14 -0700 |
| commit | 624b07f8bac33565f9e081d9abb8b81994577bcd (patch) | |
| tree | 43d574b4f3d76df014b3589a81749cbd1dbbe073 /drivers/net/wireguard/selftest | |
| parent | b019d02e03623372f784f2eb3ac76bfcf379e21e (diff) | |
| download | wireguard-linux-trimmed-624b07f8bac33565f9e081d9abb8b81994577bcd.tar.gz wireguard-linux-trimmed-624b07f8bac33565f9e081d9abb8b81994577bcd.zip | |
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: a8f1bc7bdea3 ("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>
Diffstat (limited to 'drivers/net/wireguard/selftest')
0 files changed, 0 insertions, 0 deletions