On Fri, 2009-07-10 at 16:01 -0700, Ben Blum wrote:
> +struct cgroup_pidlist {
> + /* protects the other fields */
> + struct rw_semaphore mutex;
> + /* array of xids */
> + pid_t *list;
> + /* how many elements the above list has */
> + int length;
> + /* how many files are using the current array */
> + int use_count;
> +};
I think a slightly nicer way of doing this would be to use a structure
like this:
#define NR_PIDS (PAGE_SIZE-sizeof(struct list_head))
struct pid_list {
struct list_head list;
pid_t pids[NR_PIDS];
};
That way, you can always kmalloc(sizeof(pid_list)), it fits nicely in
PAGE_SIZE, and you can chain them together.
Or, you could always just use one of the other flexible structures in
the kernel like a radix_tree.
-- Dave
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