Andrew Morton [akpm@xxxxxxxxxxxxxxxxxxxx] wrote:
| On Fri, 10 Aug 2007 15:47:59 +0400
| xemul@xxxxxxxxxx wrote:
|
| > struct pid
| > {
| > atomic_t count;
| > @@ -50,6 +50,8 @@ struct pid
| > /* lists of tasks that use this pid */
| > struct hlist_head tasks[PIDTYPE_MAX];
| > struct rcu_head rcu;
| > + int level;
| > + struct upid numbers[1];
|
| You can make this have size [0] now. It's a gcc extension and
| is used elsewhere in the kernel.
Sorry, we did not respond to this yet :-)
Well, every process has at least one 'struct upid'. The only "cost"
I see with size [1] is having to subtract 1 in create_pid_cachep().
Besides, we create/initialize the 'struct pid' for the idle process
by hand (see INIT_STRUCT_PID in init_task.h).
If we set this size to [0] now, we would need to dynamically allocate
a 'struct upid' during early boot and attach this upid to init_struct_pid.
Or is there a easy way to attach a 'upid' to init_struct_pid, statically ?
Suka
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