[PATCH 2/7] freezer: add missing mb's to freezer_count() and freezer_should_skip()

Tejun Heo tj at kernel.org
Wed Oct 24 18:57:10 UTC 2012

Hello, Oleg.

On Tue, Oct 23, 2012 at 05:39:19PM +0200, Oleg Nesterov wrote:
> > Hmm....  Guess we should drop __ from set_current_state.
> Yes.
> Or we can change ptrace_stop() and do_signal_stop() to use freezer_do_not_count/
> freezer_count and remove task_is_stopped_or_traced() from update_if_frozen()
> and try_to_freeze_tasks(). But this means that do_signal_stop() will call
> try_to_freeze() twice, unless we add __freezer_count() which only clears

Ooh, I like this idea.  If we have a mechanism to mark a task "frozen
enough", it makes sense to use it universally.  As long as
try_to_freeze() invocation stays outside fast path, I don't think
invoking it twice really matters.  Can you please cook up a patch for



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