Pavel Emelianov [EMAIL PROTECTED] wrote: | Some time ago Sukadev noticed that the vmlinux size has
Cedric pointed it out to me first :-) | grown 5Kb due to merged pid namespaces. One of the big | problems with it was fat inline functions. The other thing | was noticed by Matt - the checks for task's pid to be not | NULL take place and make the kernel grow due to inlining, | but these checks are not always needed. | | In this series I introduce a static pid (dummy), according | to Matt's proposal, which is assigned to tasks during the | detach_pid and transfer_pid instead of NULL. This pid lives | in the init pid namespace and has the id = 0, so all the | task_xid_xnr() calls will still return 0 on a dead task. | | Places that get the struct pid from task either get it from | the current (in this case they will never get this dummy), | or use it to compare with some other value (so they will | work the same for both NULL and dummy pids). | | This saves up to 340 bytes for i386 kernel with minimal | config and probably more with more users of pids. | | Tested on i386 and x86_64 boxes. Tasks still live and die, | namespaces and proc still work. | | Signed-off-by: Pavel Emelyanov <[EMAIL PROTECTED]> Acked-by: Sukadev Bhattiprolu <[EMAIL PROTECTED]> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
