From: Quentin Perret <qperret@google.com>
To: Lukasz Luba <lukasz.luba@arm.com>
Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
dri-devel@lists.freedesktop.org, linux-omap@vger.kernel.org,
linux-mediatek@lists.infradead.org,
linux-arm-msm@vger.kernel.org, linux-imx@nxp.com,
Dietmar.Eggemann@arm.com, cw00.choi@samsung.com,
b.zolnierkie@samsung.com, rjw@rjwysocki.net,
sudeep.holla@arm.com, viresh.kumar@linaro.org, nm@ti.com,
sboyd@kernel.org, rui.zhang@intel.com,
amit.kucheria@verdurent.com, daniel.lezcano@linaro.org,
mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
vincent.guittot@linaro.org, rostedt@goodmis.org,
bsegall@google.com, mgorman@suse.de, shawnguo@kernel.org,
s.hauer@pengutronix.de, festevam@gmail.com,
kernel@pengutronix.de, khilman@kernel.org, agross@kernel.org,
bjorn.andersson@linaro.org, robh@kernel.org,
matthias.bgg@gmail.com, steven.price@arm.com,
tomeu.vizoso@collabora.com, alyssa.rosenzweig@collabora.com,
airlied@linux.ie, daniel@ffwll.ch, liviu.dudau@arm.com,
lorenzo.pieralisi@arm.com, patrick.bellasi@matbug.net,
orjan.eide@arm.com, rdunlap@infradead.org, mka@chromium.org
Subject: Re: [PATCH v7 04/15] PM / EM: add support for other devices than CPUs in Energy Model
Date: Mon, 11 May 2020 14:43:19 +0100 [thread overview]
Message-ID: <20200511134319.GA29112@google.com> (raw)
In-Reply-To: <20200511111912.3001-5-lukasz.luba@arm.com>
Hey Lukasz,
On Monday 11 May 2020 at 12:19:01 (+0100), Lukasz Luba wrote:
<snip>
> @@ -27,12 +29,15 @@ struct em_perf_state {
> * em_perf_domain - Performance domain
> * @table: List of performance states, in ascending order
> * @nr_perf_states: Number of performance states
> - * @cpus: Cpumask covering the CPUs of the domain
> + * @cpus: Cpumask covering the CPUs of the domain. It's here
> + * for performance reasons to avoid potential cache
> + * misses during energy calculations in the scheduler
And because that saves a pointer, and simplifies allocating/freeing that
memory region :)
<snip>
> diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
> index 5b8a1566526a..9cc7f2973600 100644
> --- a/kernel/power/energy_model.c
> +++ b/kernel/power/energy_model.c
> @@ -2,8 +2,9 @@
> /*
> * Energy Model of CPUs
Should this comment change too?
<snip>
> -static void em_debug_create_pd(struct em_perf_domain *pd, int cpu)
> +static void em_debug_create_pd(struct device *dev)
> {
> struct dentry *d;
> - char name[8];
> int i;
>
> - snprintf(name, sizeof(name), "pd%d", cpu);
> -
> /* Create the directory of the performance domain */
> - d = debugfs_create_dir(name, rootdir);
> + d = debugfs_create_dir(dev_name(dev), rootdir);
So what will be the name for the perf domain of CPUs now? cpuX?
<snip>
> @@ -142,8 +149,8 @@ em_create_pd(struct device *dev, int nr_states, struct em_data_callback *cb,
> */
> opp_eff = freq / power;
> if (opp_eff >= prev_opp_eff)
> - pr_warn("pd%d: hertz/watts ratio non-monotonically decreasing: em_perf_state %d >= em_perf_state%d\n",
> - cpu, i, i - 1);
> + dev_dbg(dev, "EM: hertz/watts ratio non-monotonically decreasing: em_perf_state %d >= em_perf_state%d\n",
> + i, i - 1);
It feels like changing from warn to debug doesn't really belong to this
patch no?
<snip>
> @@ -216,47 +274,50 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,
> */
> mutex_lock(&em_pd_mutex);
>
> - for_each_cpu(cpu, span) {
> - /* Make sure we don't register again an existing domain. */
> - if (READ_ONCE(per_cpu(em_data, cpu))) {
> - ret = -EEXIST;
> - goto unlock;
> - }
> + if (dev->em_pd) {
> + ret = -EEXIST;
> + goto unlock;
> + }
>
> - /*
> - * All CPUs of a domain must have the same micro-architecture
> - * since they all share the same table.
> - */
> - cap = arch_scale_cpu_capacity(cpu);
> - if (prev_cap && prev_cap != cap) {
> - pr_err("CPUs of %*pbl must have the same capacity\n",
> - cpumask_pr_args(span));
> + if (_is_cpu_device(dev)) {
Something like
if (!_is_cpu_device(dev))
goto device;
would limit the diff a bit, but that may just be personal taste.
But appart from these nits, the patch LGTM.
Thanks,
Quentin
next prev parent reply other threads:[~2020-05-11 13:43 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-11 11:18 [PATCH v7 00/15] Add support for devices in the Energy Model Lukasz Luba
2020-05-11 11:18 ` [PATCH v7 01/15] PM / EM: change naming convention from 'capacity' to 'performance' Lukasz Luba
2020-05-11 11:46 ` Quentin Perret
2020-05-11 11:18 ` [PATCH v7 02/15] PM / EM: introduce em_dev_register_perf_domain function Lukasz Luba
2020-05-11 11:51 ` Quentin Perret
2020-05-11 11:19 ` [PATCH v7 03/15] PM / EM: update callback structure and add device pointer Lukasz Luba
2020-05-11 11:57 ` Quentin Perret
2020-05-12 11:11 ` Lukasz Luba
2020-05-11 11:19 ` [PATCH v7 04/15] PM / EM: add support for other devices than CPUs in Energy Model Lukasz Luba
2020-05-11 13:43 ` Quentin Perret [this message]
2020-05-12 11:38 ` Lukasz Luba
2020-05-11 11:19 ` [PATCH v7 05/15] PM / EM: remove em_register_perf_domain Lukasz Luba
2020-05-11 13:44 ` Quentin Perret
2020-05-11 11:19 ` [PATCH v7 06/15] PM / EM: change name of em_pd_energy to em_cpu_energy Lukasz Luba
2020-05-11 13:45 ` Quentin Perret
2020-05-11 11:19 ` [PATCH v7 07/15] Documentation: power: update Energy Model description Lukasz Luba
2020-05-11 13:48 ` Quentin Perret
2020-05-11 11:19 ` [PATCH v7 08/15] OPP: refactor dev_pm_opp_of_register_em() and update related drivers Lukasz Luba
2020-05-11 11:19 ` [PATCH v7 09/15] thermal: devfreq_cooling: change tracing function and arguments Lukasz Luba
2020-05-11 11:19 ` [PATCH v7 10/15] thermal: devfreq_cooling: get device load and frequency directly Lukasz Luba
2020-05-11 11:19 ` [PATCH v7 11/15] thermal: devfreq_cooling: work on a copy of device status Lukasz Luba
2020-05-11 11:19 ` [PATCH v7 12/15] thermal: devfreq_cooling: add new registration functions with Energy Model Lukasz Luba
2020-05-11 11:19 ` [PATCH v7 13/15] thermal: devfreq_cooling: remove old power model and use EM Lukasz Luba
2020-05-11 11:19 ` [PATCH v7 14/15] thermal: devfreq_cooling: update license to use SPDX Lukasz Luba
2020-05-11 11:19 ` [PATCH v7 15/15] drm/panfrost: Register devfreq cooling and attempt to add Energy Model Lukasz Luba
2020-05-22 10:43 ` [PATCH v7 00/15] Add support for devices in the " Daniel Lezcano
2020-05-22 12:58 ` Lukasz Luba
2020-05-22 13:01 ` Daniel Lezcano
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