From: Alexei Starovoitov <ast@plumgrid.com>
Date: Wed, 14 May 2014 02:50:47 +0000 (-0700)
Subject: seccomp: JIT compile seccomp filter
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~36^2~219^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8f577cadf7181243d336be9aba40c1bcc02c4c54;p=pandora-kernel.git

seccomp: JIT compile seccomp filter

Take advantage of internal BPF JIT

05-sim-long_jumps.c of libseccomp was used as micro-benchmark:

 seccomp_rule_add_exact(ctx,...
 seccomp_rule_add_exact(ctx,...

 rc = seccomp_load(ctx);

 for (i = 0; i < 10000000; i++)
    syscall(...);

$ sudo sysctl net.core.bpf_jit_enable=1
$ time ./bench
real	0m2.769s
user	0m1.136s
sys	0m1.624s

$ sudo sysctl net.core.bpf_jit_enable=0
$ time ./bench
real	0m5.825s
user	0m1.268s
sys	0m4.548s

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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