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Linus Torvalds wrote: > For _zero_ gain. The jump to the library address has to be indirect > anyway, and glibc has several places to put the information without any > mmap's or anything like that. Correct. The current implementation is optimal. It is necessary to have indirection since the target address can change. I'm never going to use self-modifying code. And it's a simple, one-instruction change. int $0x80 -> call *%gs:0x18 That's it. It's all implemented and tested. The results are in the latest NPTL source drop. The code won't be available in LinuxThreads since it requires a kernel with TLS support. As far as I'm concerned the discussion is over. I'm happy with what I have now. The additional overhead for the case when AT_SYSINFO is not available is neglegable (and can be compiled-out completely if one really wants), and in case AT_SYSINFO is available the code really is the fatest possible given the constraints mentioned above. -- --------------. ,-. 444 Castro Street Ulrich Drepper \ ,-----------------' \ Mountain View, CA 94041 USA Red Hat `--' drepper at redhat.com `--------------------------- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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