From: David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
To: penguin-kernel-JPay3/Yim36HaxMnTkn67Xf5DAMn2ifp@public.gmane.org
Cc: opurdila-+zzKsuq53OdBDgjK7y7TUQ@public.gmane.org,
amwang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
eric.dumazet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
nhorman-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org,
linux-sctp-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [RFC Patch] net: reserve ports for applications using fixed port numbers
Date: Thu, 04 Feb 2010 13:56:39 -0800 (PST) [thread overview]
Message-ID: <20100204.135639.69720709.davem@davemloft.net> (raw)
In-Reply-To: <201002050645.CEC95380.MLOtOVFFHSFOQJ-JPay3/Yim36HaxMnTkn67Xf5DAMn2ifp@public.gmane.org>
From: Tetsuo Handa <penguin-kernel-JPay3/Yim36HaxMnTkn67Xf5DAMn2ifp@public.gmane.org>
Date: Fri, 5 Feb 2010 06:45:28 +0900
> Octavian Purdila wrote:
>>
>> int inet_is_reserved_local_port(int port)
>> {
>> if (test_bit(port, reserved_ports))
>> return 1;
>> return 0;
>> }
>>
> Above check is exactly what I'm doing in the LSM hook.
But his version can be done inline in 2 or 3 instructions.
An LSM hook will result in an indirect function call,
all live registers spilled to the stack, then all of
those reloaded when the function returns.
It will be much more expensive.
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next prev parent reply other threads:[~2010-02-04 21:56 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-03 4:30 [RFC Patch] net: reserve ports for applications using fixed port numbers Amerigo Wang
[not found] ` <20100203043332.3817.27932.sendpatchset-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2010-02-03 4:39 ` Eric Dumazet
2010-02-03 5:15 ` Cong Wang
2010-02-03 11:12 ` Octavian Purdila
[not found] ` <201002031312.48531.opurdila-+zzKsuq53OdBDgjK7y7TUQ@public.gmane.org>
2010-02-04 3:23 ` Cong Wang
[not found] ` <4B6A3DBA.1000706-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2010-02-04 12:44 ` Octavian Purdila
[not found] ` <201002041444.01897.opurdila-+zzKsuq53OdBDgjK7y7TUQ@public.gmane.org>
2010-02-04 17:41 ` David Miller
[not found] ` <20100204.094110.64247447.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2010-02-04 18:15 ` Octavian Purdila
[not found] ` <201002042015.51092.opurdila-+zzKsuq53OdBDgjK7y7TUQ@public.gmane.org>
2010-02-04 18:21 ` David Miller
2010-02-04 21:45 ` Tetsuo Handa
[not found] ` <201002050645.CEC95380.MLOtOVFFHSFOQJ-JPay3/Yim36HaxMnTkn67Xf5DAMn2ifp@public.gmane.org>
2010-02-04 21:56 ` David Miller [this message]
2010-02-05 0:41 ` Tetsuo Handa
2010-02-05 1:05 ` Octavian Purdila
2010-02-05 6:01 ` Cong Wang
2010-02-05 12:28 ` Octavian Purdila
2010-02-05 4:45 ` Cong Wang
[not found] ` <4B6BA272.4090405-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2010-02-05 12:05 ` Octavian Purdila
[not found] ` <201002051405.54029.opurdila-+zzKsuq53OdBDgjK7y7TUQ@public.gmane.org>
2010-02-08 3:21 ` Cong Wang
[not found] ` <4B6F834E.4010801-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2010-02-08 16:51 ` Octavian Purdila
2010-02-05 7:11 ` Bart Van Assche
2010-02-05 7:25 ` Cong Wang
2010-02-05 9:08 ` [RFC Patch] net: reserve ports for applications using fixed portnumbers Tetsuo Handa
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