On 27/09/2023 17:27, Rafael J. Wysocki wrote:
On Wed, Sep 27, 2023 at 5:10 PM Daniel Lezcano
<daniel.lezcano@xxxxxxxxxx> wrote:
On 21/09/2023 19:55, Rafael J. Wysocki wrote:
From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Eliminate the __thermal_zone_get_trip() usage that adds unnecessary
overhead (due to pointless bounds checking and copying of trip point
data) from the power allocator thermal governor and generally make it
use trip pointers instead of trip indices where applicable.
Actually the __thermal_zone_get_trip() change was done on purpose to
replace the 'throttle' callback index parameter by the trip pointer and
removing those call to __thermal_zone_get_trip() while the code was
using the trip pointer.
IMO, the changes should focus on changing the trip_index parameter by
the trip pointer directly in the throttle ops.
So you would like .throttle() to take a trip pointer argument instead
of an index?
The difficulty here is that the user space governor needs to expose
the index to user space anyway, so it would need to find it if it gets
a trip pointer instead.
Not a big deal I suppose, but a bit of extra overhead.
Also it is easier to switch the governors over to using trip pointers
internally and then change the .throttle() argument on top of that.
The pointer can be
retrieved in the handle_thermal_trip() function and passed around for
the rest of the actions on this trip point
Right, except for the user space governor which needs a trip index.
And the indices are used for tracing too.
Given the userspace governor is going obsolete and the notifications are
for the userspace, which is slow, we can retrieve the index from the
throttling ops
--
<http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs
Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog
