Messages in this thread |  | | Subject | Re: [PATCH 2/2] PM / devfreq: Add devfreq_transitions debugfs file | From | Dmitry Osipenko <> | Date | Wed, 8 Jan 2020 00:31:29 +0300 |
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Hello Chanwoo,
07.01.2020 12:05, Chanwoo Choi пишет: > Add new devfreq_transitions debugfs file to track the frequency transitions > of all devfreq devices for the simple profiling as following: > - /sys/kernel/debug/devfreq/devfreq_transitions > > And the user can decide the storage size (CONFIG_NR_DEVFREQ_TRANSITIONS) > in Kconfig in order to save the transition history. > > [Detailed description of each field of 'devfreq_transitions' debugfs file] > - time_ms : Change time of frequency transition. (unit: millisecond) > - dev_name : Device name of h/w. > - dev : Device name made by devfreq core. > - parent_dev : If devfreq device uses the passive governor, > show parent devfreq device name. > - load_% : If devfreq device uses the simple_ondemand governor, > load is used by governor whene deciding the new frequency. > (unit: percentage) > - old_freq_hz : Frequency before changing. (unit: hz) > - new_freq_hz : Frequency after changed. (unit: hz) > > [For example on Exynos5422-based Odroid-XU3 board] > $ cat /sys/kernel/debug/devfreq/devfreq_transitions > time_ms dev_name dev parent_dev load_% old_freq_hz new_freq_hz > ---------- ------------------------------ ---------- ---------- ---------- ------------ ------------ > 14600 soc:bus_noc devfreq2 devfreq1 0 100000000 67000000 > 14600 soc:bus_fsys_apb devfreq3 devfreq1 0 200000000 100000000 > 14600 soc:bus_fsys devfreq4 devfreq1 0 200000000 100000000 > 14600 soc:bus_fsys2 devfreq5 devfreq1 0 150000000 75000000 > 14602 soc:bus_mfc devfreq6 devfreq1 0 222000000 96000000 > 14602 soc:bus_gen devfreq7 devfreq1 0 267000000 89000000 > 14602 soc:bus_g2d devfreq9 devfreq1 0 300000000 84000000 > 14602 soc:bus_g2d_acp devfreq10 devfreq1 0 267000000 67000000 > 14602 soc:bus_jpeg devfreq11 devfreq1 0 300000000 75000000 > 14602 soc:bus_jpeg_apb devfreq12 devfreq1 0 167000000 84000000 > 14603 soc:bus_disp1_fimd devfreq13 devfreq1 0 200000000 120000000 > 14603 soc:bus_disp1 devfreq14 devfreq1 0 300000000 120000000 > 14606 soc:bus_gscl_scaler devfreq15 devfreq1 0 300000000 150000000 > 14606 soc:bus_mscl devfreq16 devfreq1 0 333000000 84000000 > 14608 soc:bus_wcore devfreq1 9 333000000 84000000 > 14783 10c20000.memory-controller devfreq0 35 825000000 633000000 > 15873 soc:bus_wcore devfreq1 41 84000000 400000000 > 15873 soc:bus_noc devfreq2 devfreq1 0 67000000 100000000 > [snip] > > Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> > --- > drivers/devfreq/Kconfig | 13 +++ > drivers/devfreq/devfreq.c | 126 +++++++++++++++++++++++++++++ > drivers/devfreq/governor.h | 3 + > drivers/devfreq/governor_passive.c | 2 + > include/linux/devfreq.h | 1 + > 5 files changed, 145 insertions(+) > > diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig > index 0b1df12e0f21..84936eec0ef9 100644 > --- a/drivers/devfreq/Kconfig > +++ b/drivers/devfreq/Kconfig > @@ -74,6 +74,19 @@ config DEVFREQ_GOV_PASSIVE > through sysfs entries. The passive governor recommends that > devfreq device uses the OPP table to get the frequency/voltage. > > +comment "DEVFREQ Debugging" > + > +config NR_DEVFREQ_TRANSITIONS > + int "Maximum storage size to save DEVFREQ Transitions (10-1000)" > + depends on DEBUG_FS > + range 10 1000 > + default "100" > + help > + Show the frequency transitions of all devfreq devices via > + '/sys/kernel/debug/devfreq/devfreq_transitions' for the simple > + profiling. It needs to decide the storage size to save transition > + history of all devfreq devices. > + > comment "DEVFREQ Drivers" > > config ARM_EXYNOS_BUS_DEVFREQ > diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c > index c7f5e4e06420..7abaae06fa65 100644 > --- a/drivers/devfreq/devfreq.c > +++ b/drivers/devfreq/devfreq.c > @@ -268,6 +268,57 @@ int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) > } > EXPORT_SYMBOL(devfreq_update_status); > +/** > + * devfreq_update_transitions() - Update frequency transitions for debugfs file > + * @devfreq: the devfreq instance > + * @old_freq: the previous frequency before changing the frequency > + * @new_freq: the new frequency after frequency is changed > + */ > +struct devfreq_transitions { > + struct devfreq *devfreq; > + struct devfreq_freqs freqs; > + unsigned long load; > +} debugfs_transitions[CONFIG_NR_DEVFREQ_TRANSITIONS]; > + > +static spinlock_t devfreq_debugfs_lock;
This could be:
static DEFINE_SPINLOCK(devfreq_debugfs_lock);
and then spin_lock_init() isn't needed.
Also, The "<linux/spinlock.h>" should be included directly by devfreq.c
> +static int debugfs_transitions_index; > + > +void devfreq_update_transitions(struct devfreq *devfreq, > + unsigned long old_freq, unsigned long new_freq, > + unsigned long busy_time, unsigned long total_time) > +{ > + unsigned long load; > + int i; > + > + if (!devfreq_debugfs || !devfreq || (old_freq == new_freq)) > + return; > + > + spin_lock_nested(&devfreq_debugfs_lock, SINGLE_DEPTH_NESTING); > + > + i = debugfs_transitions_index; > + > + /* > + * Calculate the load and if load is larger than 100, > + * initialize to 100 because the unit of load is percentage. > + */ > + load = (total_time == 0 ? 0 : (100 * busy_time) / total_time); > + if (load > 100) > + load = 100; > + > + debugfs_transitions[i].devfreq = devfreq; > + debugfs_transitions[i].freqs.time = ktime_to_ms(ktime_get()); > + debugfs_transitions[i].freqs.old = old_freq; > + debugfs_transitions[i].freqs.new = new_freq; > + debugfs_transitions[i].load = load; > + > + if (++i == CONFIG_NR_DEVFREQ_TRANSITIONS) > + i = 0; > + debugfs_transitions_index = i; > + > + spin_unlock(&devfreq_debugfs_lock); > +} > +EXPORT_SYMBOL(devfreq_update_transitions);
What about EXPORT_SYMBOL_GPL()?
> /** > * find_devfreq_governor() - Find devfreq governor from name > * @name: name of the governor > @@ -401,6 +452,10 @@ static int set_target(struct devfreq *devfreq, > return err; > } > > + devfreq_update_transitions(devfreq, cur_freq, new_freq, > + devfreq->last_status.busy_time, > + devfreq->last_status.total_time); > + > freqs.new = new_freq; > notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); > > @@ -1787,6 +1842,72 @@ static int devfreq_summary_show(struct seq_file *s, void *data) > } > DEFINE_SHOW_ATTRIBUTE(devfreq_summary); > > +/** > + * devfreq_transitions_show() - Show the frequency transitions of the registered > + * devfreq devices via 'devfreq_transitions' debugfs file. > + */ > +static int devfreq_transitions_show(struct seq_file *s, void *data) > +{ > + struct devfreq *devfreq = NULL; > + struct devfreq *p_devfreq = NULL; > + struct devfreq_freqs *freqs = NULL; > + unsigned long load; > + int i = debugfs_transitions_index; > + int count; > + > + seq_printf(s, "%-10s %-30s %-10s %-10s %-6s %-12s %-12s\n", > + "time_ms", > + "dev_name", > + "dev", > + "parent_dev", > + "load_%", > + "old_freq_hz", > + "new_freq_hz"); > + seq_printf(s, "%-10s %-30s %-10s %-10s %-6s %-12s %-12s\n", > + "----------", > + "------------------------------", > + "----------", > + "----------", > + "----------", > + "------------", > + "------------"); > + > + spin_lock(&devfreq_debugfs_lock);> + for (count = 0; count < CONFIG_NR_DEVFREQ_TRANSITIONS; count++) { > + devfreq = debugfs_transitions[i].devfreq; > + freqs = &debugfs_transitions[i].freqs; > + load = debugfs_transitions[i].load; > + > + i = (CONFIG_NR_DEVFREQ_TRANSITIONS == ++i) ? 0 : i; > + if (!devfreq) > + continue; > + > +#if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE) > + if (!strncmp(devfreq->governor_name, > + DEVFREQ_GOV_PASSIVE, DEVFREQ_NAME_LEN)) { > + struct devfreq_passive_data *data = devfreq->data; > + > + if (data) > + p_devfreq = data->parent; > + } else { > + p_devfreq = NULL; > + } > +#endif > + seq_printf(s, "%-10lld %-30s %-10s %-10s %-6ld %-12ld %-12ld\n", > + freqs->time, > + dev_name(devfreq->dev.parent), > + dev_name(&devfreq->dev), > + p_devfreq ? dev_name(&p_devfreq->dev) : "", > + load, > + freqs->old, > + freqs->new); > + } > + spin_unlock(&devfreq_debugfs_lock); > + > + return 0; > +} > +DEFINE_SHOW_ATTRIBUTE(devfreq_transitions); > + > static int __init devfreq_init(void) > { > devfreq_class = class_create(THIS_MODULE, "devfreq"); > @@ -1808,9 +1929,14 @@ static int __init devfreq_init(void) > devfreq_debugfs = NULL; > pr_warn("%s: couldn't create debugfs dir\n", __FILE__); > } else { > + spin_lock_init(&devfreq_debugfs_lock); > + > debugfs_create_file("devfreq_summary", 0444, > devfreq_debugfs, NULL, > &devfreq_summary_fops); > + debugfs_create_file("devfreq_transitions", 0444, > + devfreq_debugfs, NULL, > + &devfreq_transitions_fops); > } > > return 0; > diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h > index dc7533ccc3db..01eecfdaf2d6 100644 > --- a/drivers/devfreq/governor.h > +++ b/drivers/devfreq/governor.h > @@ -68,6 +68,9 @@ extern int devfreq_add_governor(struct devfreq_governor *governor); > extern int devfreq_remove_governor(struct devfreq_governor *governor); > > extern int devfreq_update_status(struct devfreq *devfreq, unsigned long freq); > +extern void devfreq_update_transitions(struct devfreq *devfreq, > + unsigned long old_freq, unsigned long new_freq, > + unsigned long busy_time, unsigned long total_time);
The 'extern' attribute isn't needed for function prototypes defined in header files.
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