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authorDavid S. Miller <davem@davemloft.net>2017-09-19 16:32:24 -0700
committerDavid S. Miller <davem@davemloft.net>2017-09-19 16:32:24 -0700
commit8ca712c373a462cfa1b62272870b6c2c74aa83f9 (patch)
tree484826d20103aa296586883918c1ba6a3e74ef0b /net/mac802154
parent752fbcc33405d6f8249465e4b2c4e420091bb825 (diff)
parent64bc17811b72758753e2b64cd8f2a63812c61fe1 (diff)
downloadlinux-8ca712c373a462cfa1b62272870b6c2c74aa83f9.tar.bz2
Merge branch 'net-speedup-netns-create-delete-time'
Eric Dumazet says: ==================== net: speedup netns create/delete time When rate of netns creation/deletion is high enough, we observe softlockups in cleanup_net() caused by huge list of netns and way too many rcu_barrier() calls. This patch series does some optimizations in kobject, and add batching to tunnels so that netns dismantles are less costly. IPv6 addrlabels also get a per netns list, and tcp_metrics also benefit from batch flushing. This gives me one order of magnitude gain. (~50 ms -> ~5 ms for one netns create/delete pair) Tested: for i in `seq 1 40` do (for j in `seq 1 100` ; do unshare -n /bin/true >/dev/null ; done) & done wait ; grep net_namespace /proc/slabinfo Before patch series : $ time ./add_del_unshare.sh net_namespace 116 258 5504 1 2 : tunables 8 4 0 : slabdata 116 258 0 real 3m24.910s user 0m0.747s sys 0m43.162s After : $ time ./add_del_unshare.sh net_namespace 135 291 5504 1 2 : tunables 8 4 0 : slabdata 135 291 0 real 0m22.117s user 0m0.728s sys 0m35.328s ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
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