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authorEric W. Biederman <ebiederm@xmission.com>2009-12-03 02:29:09 +0000
committerDavid S. Miller <davem@davemloft.net>2009-12-03 12:23:47 -0800
commitb099ce2602d806deb41caaa578731848995cdb2a (patch)
tree7541d0d59c73e6b6274d420b8a3ec35d85ca5f2d /security
parentnet: Use rcu lookups in inet_twsk_purge. (diff)
downloadlinux-dev-b099ce2602d806deb41caaa578731848995cdb2a.tar.xz
linux-dev-b099ce2602d806deb41caaa578731848995cdb2a.zip
net: Batch inet_twsk_purge
This function walks the whole hashtable so there is no point in passing it a network namespace. Instead I purge all timewait sockets from dead network namespaces that I find. If the namespace is one of the once I am trying to purge I am guaranteed no new timewait sockets can be formed so this will get them all. If the namespace is one I am not acting for it might form a few more but I will call inet_twsk_purge again and shortly to get rid of them. In any even if the network namespace is dead timewait sockets are useless. Move the calls of inet_twsk_purge into batch_exit routines so that if I am killing a bunch of namespaces at once I will just call inet_twsk_purge once and save a lot of redundant unnecessary work. My simple 4k network namespace exit test the cleanup time dropped from roughly 8.2s to 1.6s. While the time spent running inet_twsk_purge fell to about 2ms. 1ms for ipv4 and 1ms for ipv6. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'security')
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