Pavel Emelianov [xemul@xxxxxxxxxx] wrote: | sukadev@xxxxxxxxxx wrote: | > Pavel Emelianov [xemul@xxxxxxxxxx] wrote: | > | This patch opens the flat model patches. | > | | > | The flat model idea is that struct pid has two numbers. The first one | > | (pid->nr) is a global one and is unique in the system. The second one | > | (pid->vnr) is a virtual pid. It is used on the kernel user boundary only. | > | > This approach duplicates 5 integers and 2 pointers per process for every | > process in the system. While this may not be expensive for processes that | > actually use multiple namespaces, doesn't it waste memory if majority of | > processes exist only in one namespace ? | | task_struct alignment allows for it. so does the alignment of signal structure. | and please note that this comes with appropriate ifdefs around. the only problem | is with struct pid, but we're virtualizing it after all! Hmm. I don't understand the last part "we are virtualizing 'struct pid'". Even so, with the FLAT model, every process will still have two pid_t values, two hash-chain links etc - no ? | | moreover - two integers and a pointer to the namespace is the minimal set of | fields for pid that is visible from two namespaces... I ignored the pid_namespace pointer. But even a process that exists only in init_pid_ns would have the extra fields right ? _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
