[RFC] vsyscall_A0 LD_PRELOAD implementation

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Here's an example use of the vsyscall via LD_PRELOAD.

Attached is an example library that can be LD_PRELOADED to alias glib's
gettimeofday function w/ the vsyscall implementation. I've also included
a quick performance test to give a rough idea of the savings this gives.

Example run on a SMP P4 box:

[jstultz@elm3b52 vsyscall_test]$ ./run.sh
Normal gettimeofday
gettimeofday ( 1391621us / 1000000runs ) = 1.391620us
vsyscall LD_PRELOAD gettimeofday
gettimeofday ( 286567us / 1000000runs ) = 0.286567us

So it looks like a pretty big win.

thanks
-john

• application/x-gzip attachment: vsyscall_test.tar.gz

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• Next message: Mark Mielke: "Re: epoll (was Re: [PATCH] async poll for 2.5)"
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• In reply to: john stultz: "[RFC][PATCH] linux-2.5.34_vsyscall_A0"
• Next in thread: Stephen Hemminger: "Re: [RFC][PATCH] linux-2.5.34_vsyscall_A0"
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