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[71.163.245.5]) by smtp.gmail.com with ESMTPSA id r128sm17235414qke.94.2020.12.15.06.38.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Dec 2020 06:38:07 -0800 (PST) Subject: Re: [PATCH 2/4] thermal/core: Precompute the jiffies To: Daniel Lezcano , rui.zhang@intel.com Cc: amitk@kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org References: <20201202120657.1969-1-daniel.lezcano@linaro.org> <20201202120657.1969-2-daniel.lezcano@linaro.org> From: Thara Gopinath Message-ID: <1c909a38-1777-556d-fe87-29394a1b1d56@linaro.org> Date: Tue, 15 Dec 2020 09:38:06 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201202120657.1969-2-daniel.lezcano@linaro.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Daniel, On 12/2/20 7:06 AM, Daniel Lezcano wrote: > The delays are stored in ms units and when the polling function is > called this delay is converted into jiffies at each call. > > Instead of doing the conversion again and again, compute the jiffies > at init time and use the value directly when setting the polling. A generic comment. You can avoid patch 1 of this series and directly have patch 2 , right? There is no need to rename polling_delay/passive_delay to *_delay_ms and then remove it again? > > Signed-off-by: Daniel Lezcano > --- > drivers/thermal/thermal_core.c | 5 +++-- > drivers/thermal/thermal_core.h | 18 ++++++++++++++++++ > drivers/thermal/thermal_sysfs.c | 4 ++-- > include/linux/thermal.h | 7 +++++++ > 4 files changed, 30 insertions(+), 4 deletions(-) > > diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c > index 53f55ceca220..3111ca2c87a1 100644 > --- a/drivers/thermal/thermal_core.c > +++ b/drivers/thermal/thermal_core.c > @@ -1340,8 +1340,9 @@ thermal_zone_device_register(const char *type, int trips, int mask, > tz->device.class = &thermal_class; > tz->devdata = devdata; > tz->trips = trips; > - tz->passive_delay_ms = passive_delay; > - tz->polling_delay_ms = polling_delay; > + > + thermal_zone_set_passive_delay(tz, passive_delay); > + thermal_zone_set_polling_delay(tz, polling_delay); > > /* sys I/F */ > /* Add nodes that are always present via .groups */ > diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h > index 8df600fa7b79..2c9551ed5ef8 100644 > --- a/drivers/thermal/thermal_core.h > +++ b/drivers/thermal/thermal_core.h > @@ -128,6 +128,24 @@ int thermal_build_list_of_policies(char *buf); > /* Helpers */ > void thermal_zone_set_trips(struct thermal_zone_device *tz); > > +static inline void thermal_zone_set_passive_delay( > + struct thermal_zone_device *tz, int delay_ms) > +{ > + tz->passive_delay_ms = delay_ms; > + tz->passive_delay_jiffies = msecs_to_jiffies(delay_ms); > + if (delay_ms > 1000) > + tz->passive_delay_jiffies = round_jiffies(tz->passive_delay_jiffies); > +} > + > +static inline void thermal_zone_set_polling_delay( > + struct thermal_zone_device *tz, int delay_ms) > +{ > + tz->polling_delay_ms = delay_ms; > + tz->polling_delay_jiffies = msecs_to_jiffies(delay_ms); > + if (delay_ms > 1000) > + tz->polling_delay_jiffies = round_jiffies(tz->polling_delay_jiffies); > +} How about one function instead? static inline void thermal_zone_set_delay_jiffies(int *delay_jiffes, int delay_ms) { *delay_jiffies = msecs_to_jiffies(delay_ms); if (delay_ms > 1000) *delay_jiffies = round_jiffies(*delay_jiffies); } And then calling thermal_zone_set_delay_jiffies(&tz->passive_delay_jiffies, passive_delay).. Regards Thara > + > /* sysfs I/F */ > int thermal_zone_create_device_groups(struct thermal_zone_device *, int); > void thermal_zone_destroy_device_groups(struct thermal_zone_device *); > diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c > index f465462d8aa1..9598b288a0a1 100644 > --- a/drivers/thermal/thermal_sysfs.c > +++ b/drivers/thermal/thermal_sysfs.c > @@ -234,11 +234,11 @@ passive_store(struct device *dev, struct device_attribute *attr, > > if (state && !tz->forced_passive) { > if (!tz->passive_delay_ms) > - tz->passive_delay_ms = 1000; > + thermal_zone_set_passive_delay(tz, 1000); > thermal_zone_device_rebind_exception(tz, "Processor", > sizeof("Processor")); > } else if (!state && tz->forced_passive) { > - tz->passive_delay_ms = 0; > + thermal_zone_set_passive_delay(tz, 0); > thermal_zone_device_unbind_exception(tz, "Processor", > sizeof("Processor")); > } > diff --git a/include/linux/thermal.h b/include/linux/thermal.h > index 230d451bf335..5dd9bdb6c6ad 100644 > --- a/include/linux/thermal.h > +++ b/include/linux/thermal.h > @@ -118,9 +118,14 @@ struct thermal_cooling_device { > * @trips_disabled; bitmap for disabled trips > * @passive_delay_ms: number of milliseconds to wait between polls when > * performing passive cooling. > + * @passive_delay_jiffies: number of jiffies to wait between polls when > + * performing passive cooling. > * @polling_delay_ms: number of milliseconds to wait between polls when > * checking whether trip points have been crossed (0 for > * interrupt driven systems) > + * @polling_delay_jiffies: number of jiffies to wait between polls when > + * checking whether trip points have been crossed (0 for > + * interrupt driven systems) > * @temperature: current temperature. This is only for core code, > * drivers should use thermal_zone_get_temp() to get the > * current temperature > @@ -161,6 +166,8 @@ struct thermal_zone_device { > unsigned long trips_disabled; /* bitmap for disabled trips */ > int passive_delay_ms; > int polling_delay_ms; > + int passive_delay_jiffies; > + int polling_delay_jiffies; > int temperature; > int last_temperature; > int emul_temperature; > -- Warm Regards Thara