On Sun, 02 Dec 2012 20:30:58 +0100, Oleg Nesterov wrote: > Yes, that is why I said this needs the new option.
I do not mind new options although personally I do not find them meaningful for an already deprecated ABI compatibility-only issue. > If the tracer does PTRACE_SYSCALL the tracee reports syscall exit > _after_ gettimeofday/etc. The tracer can look at regs->orig_ax == -1 > and detect that this is not syscall but vsyscall, it can look at > regs->ip then (not with the patch below). I believe applications just call PTRACE_SYSCALL twice, without checking orig_eax. At least strace and its TCB_INSYSCALL looks so. On Mon, 03 Dec 2012 00:54:58 +0100, u3...@miso.sublimeip.com wrote: > The beauty of using the x86 debug-registers, x86 debug registers are already very scarce. Besides that userland applications know they have 4 of them available so it would also break them. Regards, Jan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
