Messages in this thread | | | Subject | Re: [PATCH V5] powercap/drivers/idle_injection: Add an idle injection framework | From | Daniel Lezcano <> | Date | Wed, 6 Jun 2018 15:42:08 +0200 |
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On 06/06/2018 14:23, Peter Zijlstra wrote: > On Tue, Jun 05, 2018 at 11:16:40AM +0200, Daniel Lezcano wrote: >> + atomic_t idle_duration_ms; >> + atomic_t run_duration_ms; > >> + idle_duration_ms = atomic_read(&ii_dev->idle_duration_ms); > >> + run_duration_ms = atomic_read(&ii_dev->run_duration_ms); > >> + atomic_set(&ii_dev->run_duration_ms, run_duration_ms); >> + atomic_set(&ii_dev->idle_duration_ms, idle_duration_ms); > >> + *run_duration_ms = atomic_read(&ii_dev->run_duration_ms); >> + *idle_duration_ms = atomic_read(&ii_dev->idle_duration_ms); > >> + if (!atomic_read(&ii_dev->idle_duration_ms)) > >> + if (!atomic_read(&ii_dev->run_duration_ms)) > > What is the point of atomic_t here ?!
idle_duration and run_duration can be changed from different places at the same time. The atomic is here to ensure the read/write are consistent.
Do you think it is pointless ?
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