linux-kernel - oprofile / selinux / security_port

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Date:	Tue, 27 Mar 2007 13:06:53 +0300
From:	Sami Farin <safari-kernel@...ari.iki.fi>
To:	linux-kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: oprofile / selinux / security_port_sid

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.

-- 
Do what you love because life is too short for anything else.

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