From: Leonard Crestez <leonard.crestez@nxp.com>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Viresh Kumar <viresh.kumar@linaro.org>
Cc: Linux PM <linux-pm@vger.kernel.org>,
Linux ACPI <linux-acpi@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Sudeep Holla <sudeep.holla@arm.com>,
Dmitry Osipenko <digetx@gmail.com>
Subject: Re: [RFT][PATCH 1/3] PM: QoS: Introduce frequency QoS
Date: Thu, 24 Oct 2019 19:34:59 +0000 [thread overview]
Message-ID: <VI1PR04MB70234EB305F60855491EBFDDEE6A0@VI1PR04MB7023.eurprd04.prod.outlook.com> (raw)
In-Reply-To: VI1PR04MB7023ECFFD42193CF864524ACEE6A0@VI1PR04MB7023.eurprd04.prod.outlook.com
On 24.10.2019 22:01, Leonard Crestez wrote:
> On 16.10.2019 13:48, Rafael J. Wysocki wrote:
>> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>>
>> Introduce frequency QoS, based on the "raw" low-level PM QoS, to
>> represent min and max frequency requests and aggregate constraints.
>>
>> The min and max frequency requests are to be represented by
>> struct freq_qos_request objects and the aggregate constraints are to
>> be represented by struct freq_constraints objects. The latter are
>> expected to be initialized with the help of freq_constraints_init().
>>
>> The freq_qos_read_value() helper is defined to retrieve the aggregate
>> constraints values from a given struct freq_constraints object and
>> there are the freq_qos_add_request(), freq_qos_update_request() and
>> freq_qos_remove_request() helpers to manipulate the min and max
>> frequency requests. It is assumed that the the helpers will not
>> run concurrently with each other for the same struct freq_qos_request
>> object, so if that may be the case, their uses must ensure proper
>> synchronization between them (e.g. through locking).
>>
>> In addition, freq_qos_add_notifier() and freq_qos_remove_notifier()
>> are provided to add and remove notifiers that will trigger on aggregate
>> constraint changes to and from a given struct freq_constraints object,
>> respectively.
>>
>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>> ---
>> include/linux/pm_qos.h | 44 ++++++++
>> kernel/power/qos.c | 240 +++++++++++++++++++++++++++++++++++++++++++++++++
>> 2 files changed, 284 insertions(+)
>>
>> Index: linux-pm/include/linux/pm_qos.h
>> ===================================================================
>> --- linux-pm.orig/include/linux/pm_qos.h
>> +++ linux-pm/include/linux/pm_qos.h
>> @@ -267,4 +267,48 @@ static inline s32 dev_pm_qos_raw_resume_
>> }
>> #endif
>>
>> +#define FREQ_QOS_MIN_DEFAULT_VALUE 0
>> +#define FREQ_QOS_MAX_DEFAULT_VALUE (-1)
>> +
>> +enum freq_qos_req_type {
>> + FREQ_QOS_MIN = 1,
>> + FREQ_QOS_MAX,
>> +};
>> +
>> +struct freq_constraints {
>> + struct pm_qos_constraints min_freq;
>> + struct blocking_notifier_head min_freq_notifiers;
>> + struct pm_qos_constraints max_freq;
>> + struct blocking_notifier_head max_freq_notifiers;
>
> These min/max_freq_notifiers fields seem unused? They're initialized but
> the freq_qos_add/remove_notifier calls use min/max_freq.notifiers directly.
>
> Should probably just be dropped.
Never mind, I see now that pm_qos_constraints.notifiers is actually a
pointer to notifier block provided by somebody else.
--
Regards,
Leonard
next prev parent reply other threads:[~2019-10-24 19:35 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-16 10:37 [RFT][PATCH 0/3] cpufreq / PM: QoS: Introduce frequency QoS and use it in cpufreq Rafael J. Wysocki
2019-10-16 10:41 ` [RFT][PATCH 1/3] PM: QoS: Introduce frequency QoS Rafael J. Wysocki
2019-10-17 9:41 ` Viresh Kumar
2019-10-17 14:16 ` Rafael J. Wysocki
2019-10-18 5:41 ` Viresh Kumar
2019-10-24 19:01 ` Leonard Crestez
2019-10-24 19:34 ` Leonard Crestez [this message]
2019-11-17 7:34 ` Doug Smythies
2019-11-17 16:13 ` Doug Smythies
2019-11-19 14:35 ` Doug Smythies
2019-11-19 19:17 ` Rafael J. Wysocki
2019-11-19 22:13 ` Rafael J. Wysocki
2019-11-20 6:55 ` Doug Smythies
2019-11-20 9:08 ` Rafael J. Wysocki
2019-10-16 10:47 ` [RFT][PATCH 2/3] cpufreq: Use per-policy " Rafael J. Wysocki
2019-10-16 18:01 ` Dmitry Osipenko
2019-10-17 21:29 ` Dmitry Osipenko
2019-10-18 9:29 ` Viresh Kumar
2019-10-18 15:31 ` Dmitry Osipenko
2019-10-16 10:47 ` [RFT][PATCH 3/3] PM: QoS: Drop frequency QoS types from device PM QoS Rafael J. Wysocki
2019-10-16 14:23 ` [RFT][PATCH 0/3] cpufreq / PM: QoS: Introduce frequency QoS and use it in cpufreq Sudeep Holla
2019-10-17 9:57 ` Viresh Kumar
2019-10-17 9:59 ` Sudeep Holla
2019-10-17 16:34 ` Rafael J. Wysocki
2019-10-17 16:42 ` Sudeep Holla
2019-10-18 5:44 ` Viresh Kumar
2019-10-18 8:24 ` Rafael J. Wysocki
2019-10-18 8:27 ` Viresh Kumar
2019-10-18 8:30 ` Rafael J. Wysocki
2019-10-18 9:24 ` Viresh Kumar
2019-10-18 9:26 ` Rafael J. Wysocki
2019-10-18 9:28 ` Viresh Kumar
2019-10-17 17:14 ` Sudeep Holla
2019-10-17 9:46 ` Viresh Kumar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=VI1PR04MB70234EB305F60855491EBFDDEE6A0@VI1PR04MB7023.eurprd04.prod.outlook.com \
--to=leonard.crestez@nxp.com \
--cc=digetx@gmail.com \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=rjw@rjwysocki.net \
--cc=sudeep.holla@arm.com \
--cc=viresh.kumar@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).