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Andrew Morton <akpm@osdl.org> writes: > ebiederm@xmission.com (Eric W. Biederman) wrote:>>>> pid 0 is never exported to userspace, so hashing it servers no useful >> purpose.>> uh-huh.>>> Explicitly not hashing pid 0 allows struct pid to be marked as not >> hashed, and it allows us to avoid checks if for pid 0 when searching >> for processes to signal if pid 0 does not have a special meaning.>> Were you planning on sending a patch to avoid those checks? Because right > now, this patch looks like a net loss. Yes. I just asked for comments on linux-kernel. Before I go further I feel honor bound to explain my biases. ..... I am stuck out in no man land on clusters without customary OS services. Because of their distributed nature I have applications I cannot swap, can barely suspend, and cannot migrate to other cpus. To solve that problem it looks to me like I need multiple namespace support in the OS so when I migrate an application I can capture all of the OS state the application depends on. With respect to namespaces I have done some proof of concept implementations and now that I know that what I want is possible I am working on a production quality implementation. I am starting with working my way towards multiple instances of a PID namespace in the kernel. What you have seen are the first couple of cleanups to get the worst of the offenders from being a hinderance. The next step is to fix the problem of pid reference wrap around, inside the kernel. At least this looks to be a promising direction to solve a rare case and lay the foundation that I will need for multiple instances of the pid namespace. I am doing my best to work with all interested parties and to provide a good solution that works for everyone and not just me. Taking everything in small obviously correct patches as I go. Eric - 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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