linux-kernel - Re: [PATCH v1 1/3] thermal/debugfs: Avoid excessive updates of trip point statistics

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Date: Tue, 23 Apr 2024 17:54:00 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>,
 Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, "Rafael J. Wysocki"
 <rafael@...nel.org>, Lukasz Luba <lukasz.luba@....com>
Subject: Re: [PATCH v1 1/3] thermal/debugfs: Avoid excessive updates of trip
 point statistics

On 17/04/2024 15:09, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Since thermal_debug_update_temp() is called before invoking
> thermal_debug_tz_trip_down() for the trips that were crossed by the
> zone temperature on the way up, it updates the statistics for them
> as though the current zone temperature was above the low temperature
> of each of them.  However, if a given trip has just been crossed on the
> way down, the zone temperature is in fact below its low temperature,
> but this is handled by thermal_debug_tz_trip_down() running after the
> update of the trip statistics.
> 
> The remedy is to call thermal_debug_update_temp() after
> thermal_debug_tz_trip_down() has been invoked for all of the
> trips in question, but then thermal_debug_tz_trip_up() needs to
> be adjusted, so it does not update the statistics for the trips
> that has just been crossed on the way up, as that will be taken
> care of by thermal_debug_update_temp() down the road.
> 
> Modify the code accordingly.
> 
> Fixes: 7ef01f228c9f ("thermal/debugfs: Add thermal debugfs information for mitigation episodes")
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>

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