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Linus Torvalds wrote: > > Uli's suggested glibc approach is to just put the magis system call > address (which glibc gets from the AT_SYSINFO elf aux table entry) into > the per-thread TLS area, which is alway spointed to by %gs anyway. > > THIS WORKS WITH ALL DSO'S WITHOUT ANY GAMES, ANY MMAP'S, ANY RELINKING, OR > ANY EXTRA WORK AT ALL! > > The system call entry becomes a simple > > call *%gs:constant-offset > > Not mmap. No magic system calls. No relinking. Not _nothing_. One > instruction, that's it. > Unfortunately it means taking an indirect call cost for every invocation... -hpa - 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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