[PATCH 6/6] Makes procs file writable to move all threads by tgid at once

Paul Menage menage at google.com
Mon Aug 3 18:05:16 PDT 2009

On Mon, Aug 3, 2009 at 5:56 PM, Benjamin Blum<bblum at google.com> wrote:
> No, the idea is that even though we had a reference that we already
> dropped, we in effect "traded" the newcg to the task for its oldcg,
> giving it our reference on newcg and gaining its reference on oldcg. I
> believe the cgroup_mutex guarantees that it'll still be there when we
> do the trade - perhaps a BUG_ON(tsk->cgroups != oldcg) is wanted
> inside the second task_lock section there?

I don't think that's safe, since the task could exit and drop its
reference (and switch to init_css_set).

>> I think it's more intuitive to return 1 if found and 0 if not found.
> I was sticking with the convention of nonzero return values indicating
> failure, as is used everywhere else in this context.

Make it a bool, so that it's intuitively more obvious that true==success?


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