Re: [PATCH V9] powercap/drivers/idle_injection: Add an idle injection framework

On Mon, Jun 25, 2018 at 1:52 PM, Daniel Lezcano
[off-list ref] wrote:

On 25/06/2018 10:23, Rafael J. Wysocki wrote:

[ ... ]

quoted

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+ * It is up to the user of this framework to provide a lock at an
+ * upper level to prevent stupid things to happen, like starting while
+ * we are unregistering.
+ */

The English above and elsewhere needs some polishing IMO, but I can
take care of that. :-)

I can give a try and if you are still unhappy, you change them in a
better way.

Well, I could tell you what I would write, but then it'll take less
time and effort if I just write it myself. :-)

[ ... ]

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+static void idle_injection_setup(unsigned int cpu)
+{
+       struct sched_param param = { .sched_priority = MAX_USER_RT_PRIO / 2 };
+
+       set_freezable();

Why do you need set_freezable() here?

We don't want to continue injecting idle cycles when the system is
suspended.

And where's the corresponding try_to_freeze() called?