Messages in this thread | | | Date | Mon, 22 May 2006 11:26:08 -0400 | From | Daniel Jacobowitz <> | Subject | Re: [PATCH] 2-ptrace_multi |
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On Mon, May 22, 2006 at 05:05:44PM +0200, Renzo Davoli wrote: > Then it would be inconsistent with ppc64 where it does exist, and ppc64 > has the very same problem. > So the solution would be to patch also the ppc64 [GS]ETREGS breaking > compatibility with existing applications.
Or use new ptrace operations for the full regsets; that is probably wiser.
> The MULTI proposal was a way to have a fast, simple, safe support. > Fast: one syscall does all
You've added copy_from_user to several operations which were previously entirely register-based calling conventions. In at least some configurations this will dwarf the cost of the system call trap.
> If you do not find this proposal interesting, I'll continue to support > it as a specific patch for umview. I am not here to "sell" any solution. > On the contrary I think it might be useful in many applications.
Well, I'm afraid that I don't find it interesting; and I don't think GDB would make use of it.
-- Daniel Jacobowitz CodeSourcery - 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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