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dc680de28c
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: e7096c131e ("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>
79 lines
1.6 KiB
C
79 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#include "version.h"
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#include "device.h"
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#include "noise.h"
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#include "queueing.h"
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#include "ratelimiter.h"
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#include "netlink.h"
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#include <uapi/linux/wireguard.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/genetlink.h>
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#include <net/rtnetlink.h>
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static int __init mod_init(void)
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{
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int ret;
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ret = wg_allowedips_slab_init();
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if (ret < 0)
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goto err_allowedips;
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#ifdef DEBUG
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ret = -ENOTRECOVERABLE;
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if (!wg_allowedips_selftest() || !wg_packet_counter_selftest() ||
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!wg_ratelimiter_selftest())
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goto err_peer;
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#endif
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wg_noise_init();
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ret = wg_peer_init();
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if (ret < 0)
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goto err_peer;
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ret = wg_device_init();
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if (ret < 0)
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goto err_device;
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ret = wg_genetlink_init();
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if (ret < 0)
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goto err_netlink;
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pr_info("WireGuard " WIREGUARD_VERSION " loaded. See www.wireguard.com for information.\n");
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pr_info("Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.\n");
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return 0;
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err_netlink:
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wg_device_uninit();
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err_device:
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wg_peer_uninit();
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err_peer:
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wg_allowedips_slab_uninit();
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err_allowedips:
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return ret;
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}
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static void __exit mod_exit(void)
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{
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wg_genetlink_uninit();
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wg_device_uninit();
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wg_peer_uninit();
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wg_allowedips_slab_uninit();
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}
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module_init(mod_init);
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module_exit(mod_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("WireGuard secure network tunnel");
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MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");
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MODULE_VERSION(WIREGUARD_VERSION);
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MODULE_ALIAS_RTNL_LINK(KBUILD_MODNAME);
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MODULE_ALIAS_GENL_FAMILY(WG_GENL_NAME);
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