From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: Lukasz Luba <lukasz.luba@arm.com>,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
rafael@kernel.org
Cc: rui.zhang@intel.com, amit.kucheria@verdurent.com,
amit.kachhap@gmail.com, daniel.lezcano@linaro.org,
viresh.kumar@linaro.org, len.brown@intel.com, pavel@ucw.cz,
Pierre.Gondois@arm.com, ionela.voinescu@arm.com,
rostedt@goodmis.org, mhiramat@kernel.org
Subject: Re: [PATCH v2 05/17] trace: energy_model: Add trace event for EM runtime modifications
Date: Tue, 30 May 2023 12:03:27 +0200 [thread overview]
Message-ID: <3ed3c9a0-8aed-02ad-b7f0-69200441a994@arm.com> (raw)
In-Reply-To: <20230512095743.3393563-6-lukasz.luba@arm.com>
On 12/05/2023 11:57, Lukasz Luba wrote:
> The Energy Model (EM) supports runtime modifications. Track the changes
> in order to do post-processing analysis. Don't use arrays in the trace
> event, since they are not properly supported by the tools. Instead use
> simple "unroll" with emitting the trace event for each EM array entry
> with proper ID information. The older debugging mechanism which was
> the simple debugfs which dumping the EM content won't be sufficient for
> the modifiable EM purpose. This trace event mechanism would address the
> needs.
Do we really need a full trace_event for this? Can we not follow the
task scheduler rule which says no new trace_events and use a trace_point
here? The footprint in the kernel would be so much smaller.
E.g. pelt_cfs_tp
0 sched.h 694 DECLARE_TRACE(pelt_cfs_tp,
1 core.c 106 EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_cfs_tp);
2 fair.c 3937 trace_pelt_cfs_tp(cfs_rq);
And then this patch should be after the section with the functional changes.
[...]
next prev parent reply other threads:[~2023-05-30 10:03 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-12 9:57 [PATCH v2 00/17] Introduce runtime modifiable Energy Model Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 01/17] PM: EM: Refactor em_cpufreq_update_efficiencies() arguments Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 02/17] PM: EM: Find first CPU online while updating OPP efficiency Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 03/17] PM: EM: Refactor em_pd_get_efficient_state() to be more flexible Lukasz Luba
2023-05-30 11:06 ` Dietmar Eggemann
2023-07-03 16:22 ` Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 04/17] PM: EM: Create a new function em_compute_costs() Lukasz Luba
2023-05-30 9:51 ` Dietmar Eggemann
2023-07-03 15:09 ` Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 05/17] trace: energy_model: Add trace event for EM runtime modifications Lukasz Luba
2023-05-30 10:03 ` Dietmar Eggemann [this message]
2023-07-03 15:53 ` Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 06/17] PM: EM: Add update_power() callback for " Lukasz Luba
2023-05-30 9:31 ` Dietmar Eggemann
2023-07-03 15:06 ` Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 07/17] PM: EM: Check if the get_cost() callback is present in em_compute_costs() Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 08/17] PM: EM: Introduce runtime modifiable table Lukasz Luba
2023-05-14 4:28 ` kernel test robot
2023-05-30 10:18 ` Dietmar Eggemann
2023-07-03 15:58 ` Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 09/17] PM: EM: Add RCU mechanism which safely cleans the old data Lukasz Luba
2023-05-30 10:02 ` Dietmar Eggemann
2023-07-03 15:49 ` Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 10/17] PM: EM: Add runtime update interface to modify EM power Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 11/17] PM: EM: Use runtime modified EM for CPUs energy estimation in EAS Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 12/17] PM: EM: Add argument to get_cost() for runtime modification Lukasz Luba
2023-05-30 9:53 ` Dietmar Eggemann
2023-07-03 15:30 ` Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 13/17] PM: EM: Refactor struct em_perf_domain and add default_table Lukasz Luba
2023-05-30 10:23 ` Dietmar Eggemann
2023-07-03 16:00 ` Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 14/17] Documentation: EM: Add a new section about the design Lukasz Luba
2023-05-30 10:33 ` Dietmar Eggemann
2023-07-03 16:09 ` Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 15/17] Documentation: EM: Add a runtime modifiable EM design description Lukasz Luba
2023-05-30 10:42 ` Dietmar Eggemann
2023-07-03 16:13 ` Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 16/17] Documentation: EM: Add example with driver modifying the EM Lukasz Luba
2023-05-12 9:57 ` [PATCH v2 17/17] Documentation: EM: Describe the API of runtime modifications Lukasz Luba
2023-05-24 17:25 ` [PATCH v2 00/17] Introduce runtime modifiable Energy Model Rafael J. Wysocki
2023-07-03 11:08 ` Lukasz Luba
2023-05-30 11:07 ` Dietmar Eggemann
2023-07-03 16:35 ` Lukasz Luba
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