oprofile / selinux / security_port_sid
From: Sami Farin
Date: Tue Mar 27 2007 - 06:07:27 EST
is there room for improvement in security_port_sid() ?
little test with dns queries (dnsfilter (the client) on local host
using poll() and dnscache (the server) using epoll (at max 4000 concurrent
queries):
(stats for only vmlinux)
CPU: P4 / Xeon, speed 2797.32 MHz (estimated)
Counted GLOBAL_POWER_EVENTS events (time during which processor is not stopped) with a unit mask of 0x01 (mandatory) count 45000
Counted FSB_DATA_ACTIVITY events (DRDY or DBSY events on the front side bus) with a unit mask of 0x03 (multiple flags) count 45000
Counted BRANCH_RETIRED events (retired branches) with a unit mask of 0x05 (multiple flags) count 45000
Counted BRANCH_RETIRED events (retired branches) with a unit mask of 0x0a (multiple flags) count 45000
samples % samples % samples % samples % symbol name
220663 10.2181 6704 17.9737 5735 7.5171 27 1.1989 datagram_poll
140086 6.4869 3239 8.6839 3786 4.9624 24 1.0657 sock_poll
119636 5.5399 2172 5.8232 7168 9.3954 24 1.0657 do_poll
101512 4.7006 3987 10.6893 812 1.0643 14 0.6217 udp_get_port
71008 3.2881 1017 2.7266 2694 3.5311 397 17.6288 security_port_sid
64350 2.9798 144 0.3861 1912 2.5061 6 0.2664 add_wait_queue
60815 2.8161 187 0.5014 3246 4.2546 2 0.0888 remove_wait_queue
47456 2.1975 1823 4.8875 476 0.6239 31 1.3766 udp_v4_lookup_longway
if dnsfilter had used epoll, security_port_sid would
probably (?) be number one (or two or three) CPU user in kernel.
also note that 17.6% of mispredicted branches occurr in security_port_sid.
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