Re: [Powertop] [PATCH] devfreq: add devfreq devices stats support

[Alexandra Yates <alexandra.yates at linux.intel.com>]

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> add window to show frequency stats for devfreq devices
>
> Signed-off-by: Rajagopal Venkat <rajagopal.venkat(a)gmail.com>
> Signed-off-by: Sanjay Singh Rawat <sanjay.rawat(a)linaro.org>
> ---
>  src/Makefile.am           |   2 +-
>  src/devices/devfreq.cpp   | 351
> ++++++++++++++++++++++++++++++++++++++++++++++
>  src/devices/devfreq.h     |  75 ++++++++++
>  src/main.cpp              |   9 ++
>  src/report/report-maker.h |   1 +
>  5 files changed, 437 insertions(+), 1 deletion(-)
>  create mode 100644 src/devices/devfreq.cpp
>  create mode 100644 src/devices/devfreq.h
>
> diff --git a/src/Makefile.am b/src/Makefile.am
> index 6886388..fee1ffa 100644
> --- a/src/Makefile.am
> +++ b/src/Makefile.am
> @@ -32,7 +32,7 @@ powertop_SOURCES = parameters/persistent.cpp
> parameters/learn.cpp parameters/par
>  		report/report-formatter-csv.cpp report/report-formatter-csv.h \
>  		report/report-formatter-html.cpp report/report-formatter-html.h \
>  		report/report-data-html.cpp report/report-data-html.h \
> -		main.cpp css.h powertop.css cpu/intel_gpu.cpp \
> +		main.cpp css.h powertop.css cpu/intel_gpu.cpp devices/devfreq.cpp \
>  		cpu/rapl/rapl_interface.cpp cpu/cpu_rapl_device.cpp
> cpu/rapl/rapl_interface.h\
>  		cpu/dram_rapl_device.cpp devices/gpu_rapl_device.cpp
> cpu/cpu_rapl_device.h \
>  		cpu/dram_rapl_device.h devices/gpu_rapl_device.h
> diff --git a/src/devices/devfreq.cpp b/src/devices/devfreq.cpp
> new file mode 100644
> index 0000000..29d7790
> --- /dev/null
> +++ b/src/devices/devfreq.cpp
> @@ -0,0 +1,351 @@
> +/*
> + * Copyright 2012, Linaro
> + *
> + * This file is part of PowerTOP
> + *
> + * This program file is free software; you can redistribute it and/or
> modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful, but
> WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
> + * for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program in a file named COPYING; if not, write to the
> + * Free Software Foundation, Inc,
> + * 51 Franklin Street, Fifth Floor,
> + * Boston, MA 02110-1301 USA
> + * or just google for it.
> + *
> + * Authors:
> + *	Rajagopal Venkat <rajagopal.venkat(a)linaro.org>
> + */
> +
> +#include <iostream>
> +#include <fstream>
> +
> +#include <dirent.h>
> +#include <stdlib.h>
> +#include <time.h>
> +#include <unistd.h>
> +
> +#include "device.h"
> +#include "devfreq.h"
> +#include "../display.h"
> +#include "../cpu/cpu.h"
> +#include "../report/report.h"
> +#include "../report/report-maker.h"
> +
> +static bool is_enabled = true;
> +
> +static vector<class devfreq *> all_devfreq;
> +
> +devfreq::devfreq(const char* dpath): device()
> +{
> +	strncpy(dir_name, dpath, sizeof(dir_name));
> +}
> +
> +uint64_t devfreq::parse_freq_time(char* pchr)
> +{
> +	char *cptr, *pptr = pchr;
> +	uint64_t ctime;
> +
> +	cptr = strtok(pchr, " :");
> +	while (cptr != NULL) {
> +		cptr = strtok(NULL, " :");
> +		if (cptr )
> +			pptr = cptr;
> +	}
> +
> +	ctime = strtoull(pptr, NULL, 10);
> +	return ctime;
> +}
> +
> +void devfreq::process_time_stamps()
> +{
> +	unsigned int i;
> +	uint64_t active_time = 0;
> +
> +	sample_time = (1000000.0 * (stamp_after.tv_sec - stamp_before.tv_sec))
> +			+ ((stamp_after.tv_usec - stamp_before.tv_usec) );
> +
> +	for (i=0; i < dstates.size()-1; i++) {
> +		struct frequency *state = dstates[i];
> +		state->time_after = 1000 * (state->time_after - state->time_before);
> +		active_time += state->time_after;
> +	}
> +	/* Compute idle time for the device */
> +	dstates[i]->time_after = sample_time - active_time;
> +}
> +
> +void devfreq::add_devfreq_freq_state(uint64_t freq, uint64_t time)
> +{
> +	struct frequency *state;
> +
> +	state = new(std::nothrow) struct frequency;
> +	if (!state)
> +		return;
> +
> +	memset(state, 0, sizeof(*state));
> +	dstates.push_back(state);
> +
> +	state->freq = freq;
> +	if (freq == 0)
> +		strcpy(state->human_name, "Idle");
> +	else
> +		hz_to_human(freq, state->human_name);
> +	state->time_before = time;
> +}
> +
> +void devfreq::update_devfreq_freq_state(uint64_t freq, uint64_t time)
> +{
> +	unsigned int i;
> +	struct frequency *state = NULL;
> +
> +	for(i=0; i < dstates.size(); i++) {
> +		if (freq == dstates[i]->freq)
> +			state = dstates[i];
> +	}
> +
> +	if (state == NULL) {
> +		add_devfreq_freq_state(freq, time);
> +		return;
> +	}
> +
> +	state->time_after = time;
> +}
> +
> +void devfreq::parse_devfreq_trans_stat(char *dname)
> +{
> +	ifstream file;
> +	char filename[256];
> +
> +	sprintf(filename, "/sys/class/devfreq/%s/trans_stat", dir_name);
> +	file.open(filename);
> +
> +	if (!file)
> +		return;
> +
> +	char line[1024];
> +	char *c;
> +
> +	while (file) {
> +		uint64_t freq;
> +		uint64_t time;
> +		char *pchr;
> +
> +		memset(line, 0, sizeof(line));
> +		file.getline(line, sizeof(line));
> +
> +		pchr = strchr(line, '*');
> +		pchr = (pchr != NULL) ? pchr+1 : line;
> +
> +		freq = strtoull(pchr, &c, 10);
> +		if (!freq)
> +			continue;
> +
> +		time = parse_freq_time(pchr);
> +		update_devfreq_freq_state(freq, time);
> +	}
> +	file.close();
> +}
> +
> +void devfreq::start_measurement(void)
> +{
> +	unsigned int i;
> +	ifstream file;
> +
> +	for (i=0; i < dstates.size(); i++)
> +		delete dstates[i];
> +	dstates.resize(0);
> +	sample_time = 0;
> +
> +	gettimeofday(&stamp_before, NULL);
> +	parse_devfreq_trans_stat(dir_name);
> +	/* add device idle state */
> +	update_devfreq_freq_state(0, 0);
> +}
> +
> +void devfreq::end_measurement(void)
> +{
> +	parse_devfreq_trans_stat(dir_name);
> +	gettimeofday(&stamp_after, NULL);
> +	process_time_stamps();
> +}
> +
> +double devfreq::power_usage(struct result_bundle *result, struct
> parameter_bundle *bundle)
> +{
> +	return 0;
> +}
> +
> +double devfreq::utilization(void)
> +{
> +	return 0;
> +}
> +
> +void devfreq::fill_freq_utilization(unsigned int idx, char *buf)
> +{
> +	buf[0] = 0;
> +
> +	if (idx < dstates.size() && dstates[idx]) {
> +		struct frequency *state = dstates[idx];
> +		sprintf(buf, " %5.1f%% ", percentage(1.0 * state->time_after /
> sample_time));
> +	}
> +}
> +
> +void devfreq::fill_freq_name(unsigned int idx, char *buf)
> +{
> +	buf[0] = 0;
> +
> +	if (idx < dstates.size() && dstates[idx]) {
> +		sprintf(buf, "%-15s", dstates[idx]->human_name);
> +	}
> +}
> +
> +void start_devfreq_measurement(void)
> +{
> +	unsigned int i;
> +
> +	for (i=0; i<all_devfreq.size(); i++)
> +		all_devfreq[i]->start_measurement();
> +}
> +
> +void end_devfreq_measurement(void)
> +{
> +	unsigned int i;
> +
> +	for (i=0; i<all_devfreq.size(); i++)
> +		all_devfreq[i]->end_measurement();
> +}
> +
> +static void devfreq_dev_callback(const char *d_name)
> +{
> +	devfreq *df = new(std::nothrow) class devfreq(d_name);
> +	if (df)
> +		all_devfreq.push_back(df);
> +}
> +
> +void create_all_devfreq_devices(void)
> +{
> +	DIR *dir;
> +	std::string p = "/sys/class/devfreq/";
> +	dir = opendir(p.c_str());
> +	if (dir == NULL) {
> +		fprintf(stderr, "Devfreq not enabled\n");
> +		is_enabled = false;
> +		return;
> +	}
> +
> +	callback fn = &devfreq_dev_callback;
> +	process_directory(p.c_str(), fn);
> +}
> +
> +void initialize_devfreq(void)
> +{
> +	if (is_enabled)
> +		create_tab("Device Freq stats", _("Device Freq stats"));
> +}
> +
> +void display_devfreq_devices(void)
> +{
> +	unsigned int i, j;
> +	WINDOW *win;
> +	char fline[1024];
> +	char buf[128];
> +
> +	win = get_ncurses_win("Device Freq stats");
> +        if (!win)
> +                return;
> +
> +        wclear(win);
> +        wmove(win, 2,0);
> +
> +	if (!is_enabled) {
> +		wprintw(win, _(" Devfreq is not enabled"));
> +		return;
> +	}
> +
> +	if (!all_devfreq.size()) {
> +		wprintw(win, _(" No devfreq devices available"));
> +		return;
> +	}
> +
> +	for (i=0; i<all_devfreq.size(); i++) {
> +
> +		class devfreq *df = all_devfreq[i];
> +		wprintw(win, "\n%s\n", df->device_name());
> +
> +		for(j=0; j < df->dstates.size(); j++) {
> +			memset(fline, 0, sizeof(fline));
> +			strcpy(fline, "\t");
> +			df->fill_freq_name(j, buf);
> +			strcat(fline, buf);
> +			df->fill_freq_utilization(j, buf);
> +			strcat(fline, buf);
> +			strcat(fline, "\n");
> +			wprintw(win, fline);
> +		}
> +		wprintw(win, "\n");
> +	}
> +}
> +
> +void report_devfreq_devices(void)
> +{
> +	if (!is_enabled) {
> +		return;
> +	}
> +
> +/* todo: adapt to new report format */
> +#if 0
> +	char buffer[512];
> +	unsigned int i, j;
> +
> +	report.begin_section(SECTION_DEVFREQ);
> +	report.add_header("Device Frequency Report");
> +
> +	report.begin_table(TABLE_WIDE);
> +	if (!all_devfreq.size()) {
> +		report.begin_row();
> +		report.add(" No devfreq devices available");
> +		return;
> +	}
> +
> +	for (i = 0; i < all_devfreq.size(); i++) {
> +		buffer[0] = 0;
> +		class devfreq *df = all_devfreq[i];
> +
> +		report.begin_row();
> +		report.begin_cell(CELL_CPU_PSTATE_HEADER);
> +		report.addf("%s", df->device_name());
> +
> +		for (j = 0; j < df->dstates.size(); j++) {
> +			report.begin_row();
> +			report.begin_cell(CELL_CPU_STATE_VALUE);
> +			df->fill_freq_name(j, buffer);
> +			report.add(buffer);
> +			report.begin_cell(CELL_CPU_STATE_VALUE);
> +			df->fill_freq_utilization(j, buffer);
> +			report.add(buffer);
> +		}
> +	}
> +#endif
> +
> +}
> +
> +void clear_all_devfreq()
> +{
> +	unsigned int i, j;
> +
> +	for (i=0; i < all_devfreq.size(); i++) {
> +		class devfreq *df = all_devfreq[i];
> +
> +		for(j=0; j < df->dstates.size(); j++)
> +			delete df->dstates[j];
> +
> +		df->dstates.resize(0);
> +		delete df;
> +	}
> +	all_devfreq.clear();
> +}
> diff --git a/src/devices/devfreq.h b/src/devices/devfreq.h
> new file mode 100644
> index 0000000..8ab5705
> --- /dev/null
> +++ b/src/devices/devfreq.h
> @@ -0,0 +1,75 @@
> +/*
> + * Copyright 2012, Linaro
> + *
> + * This file is part of PowerTOP
> + *
> + * This program file is free software; you can redistribute it and/or
> modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful, but
> WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
> + * for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program in a file named COPYING; if not, write to the
> + * Free Software Foundation, Inc,
> + * 51 Franklin Street, Fifth Floor,
> + * Boston, MA 02110-1301 USA
> + * or just google for it.
> + *
> + * Authors:
> + *	Rajagopal Venkat <rajagopal.venkat(a)linaro.org>
> + */
> +#ifndef _INCLUDE_GUARD_DEVFREQ_H
> +#define _INCLUDE_GUARD_DEVFREQ_H
> +
> +#include "device.h"
> +#include "../parameters/parameters.h"
> +
> +struct frequency;
> +
> +class devfreq: public device {
> +	char dir_name[4096];
> +	struct timeval  stamp_before, stamp_after;
> +	double sample_time;
> +
> +	uint64_t parse_freq_time(char *ptr);
> +	void add_devfreq_freq_state(uint64_t freq, uint64_t time);
> +	void update_devfreq_freq_state(uint64_t freq, uint64_t time);
> +	void parse_devfreq_trans_stat(char *dname);
> +	void process_time_stamps();
> +
> +public:
> +
> +	vector<struct frequency *> dstates;
> +
> +	devfreq(const char *c);
> +	void fill_freq_utilization(unsigned int idx, char *buf);
> +	void fill_freq_name(unsigned int idx, char *buf);
> +
> +	virtual void start_measurement(void);
> +	virtual void end_measurement(void);
> +
> +	virtual double	utilization(void); /* percentage */
> +
> +	virtual const char * class_name(void) { return "devfreq";};
> +
> +	virtual const char * device_name(void) { return dir_name;};
> +	virtual const char * human_name(void) { return "devfreq";};
> +	virtual double power_usage(struct result_bundle *result, struct
> parameter_bundle *bundle);
> +	virtual const char * util_units(void) { return " rpm"; };
> +	virtual int power_valid(void) { return 0;
> /*utilization_power_valid(r_index);*/};
> +	virtual int grouping_prio(void) { return 1; };
> +};
> +
> +extern void create_all_devfreq_devices(void);
> +extern void clear_all_devfreq(void);
> +extern void display_devfreq_devices(void);
> +extern void report_devfreq_devices(void);
> +extern void initialize_devfreq(void);
> +extern void start_devfreq_measurement(void);
> +extern void end_devfreq_measurement(void);
> +
> +#endif
> diff --git a/src/main.cpp b/src/main.cpp
> index cf4e547..d33eaed 100644
> --- a/src/main.cpp
> +++ b/src/main.cpp
> @@ -48,6 +48,7 @@
>
>
>  #include "devices/device.h"
> +#include "devices/devfreq.h"
>  #include "devices/usb.h"
>  #include "devices/ahci.h"
>  #include "measurement/measurement.h"
> @@ -194,6 +195,7 @@ void one_measurement(int seconds, char *workload)
>  	create_all_usb_devices();
>  	start_power_measurement();
>  	devices_start_measurement();
> +	start_devfreq_measurement();
>  	start_process_measurement();
>  	start_cpu_measurement();
>
> @@ -206,6 +208,7 @@ void one_measurement(int seconds, char *workload)
>  	end_cpu_measurement();
>  	end_process_measurement();
>  	collect_open_devices();
> +	end_devfreq_measurement();
>  	devices_end_measurement();
>  	end_power_measurement();
>
> @@ -233,6 +236,9 @@ void one_measurement(int seconds, char *workload)
>  	report_show_open_devices();
>
>  	report_devices();
> +	display_devfreq_devices();
> +	report_devfreq_devices();
> +
>  	ahci_create_device_stats_table();
>  	store_results(measurement_time);
>  	end_cpu_data();
> @@ -344,6 +350,7 @@ static void powertop_init(void)
>
>  	enumerate_cpus();
>  	create_all_devices();
> +	create_all_devfreq_devices();
>  	detect_power_meters();
>
>  	register_parameter("base power", 100, 0.5);
> @@ -457,6 +464,7 @@ int main(int argc, char **argv)
>  		exit(0);
>  	}
>  	init_display();
> +	initialize_devfreq();
>  	initialize_tuning();
>  	/* first one is short to not let the user wait too long */
>  	one_measurement(1, NULL);
> @@ -491,6 +499,7 @@ int main(int argc, char **argv)
>
>  	clean_open_devices();
>  	clear_all_devices();
> +	clear_all_devfreq();
>  	clear_all_cpus();
>
>  	return 0;
> diff --git a/src/report/report-maker.h b/src/report/report-maker.h
> index 423568a..bda4cef 100644
> --- a/src/report/report-maker.h
> +++ b/src/report/report-maker.h
> @@ -89,6 +89,7 @@ enum section_type {
>  	SECTION_SYSINFO,
>  	SECTION_CPUIDLE,
>  	SECTION_CPUFREQ,
> +	SECTION_DEVFREQ,
>  	SECTION_DEVPOWER,
>  	SECTION_SOFTWARE,
>  	SECTION_SUMMARY,
> --
> 1.8.3.2
>
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> PowerTop(a)lists.01.org
> https://lists.01.org/mailman/listinfo/powertop
>

Hi Sanjay,

It would be better that Device Frequency Stats appears only when
/sys/class/devfewq is present on the system.  That will simplify code
execution at runtime and remove the blank window with "No devfreq devices
available".

Thank you,
Alexandra.