Re: [PATCH 02/10] freezer: skip waking up tasks with PF_FREEZER_SKIPset

From: Tejun Heo
Date: Mon Apr 29 2013 - 17:57:55 EST

On Mon, Apr 29, 2013 at 02:51:57PM -0700, Tejun Heo wrote:
> I feel a bit weary of changes which try to optimize state checks for
> freezer because the synchronization rules are kinda fragile and things
> may not work reliably depending on who's testing the flag, and it has
> been subtly broken in various ways in the past (maybe even now). Can

And BTW, this is why the function is only used when checking whether a
task is frozen rather than to decide to issue freeze_task() on it, and
it seems your change is correct now that we don't have per-task FREEZE
flag but I can't say I like the change. I'd really like to keep
things as dumb as possible for freezer.


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