[PATCH 7/8] perf timechart: Map power:cpu_idle events to the corresponding cpuidle state

From: Thomas Renninger
Date: Thu Dec 02 2010 - 11:44:11 EST

Before, power:cpu_idle events were very specific X86 Intel mwait events.
This got fixed with previous patches and cpu_idle events are now thrown by
all cpuidle drivers and can be mapped to the corresponding cpuidle state
in /sys.

This patch reads out the corresponding cpuidle name of a cpu_idle event
and uses it in the title line of the chart (c-states Cx in x86, omap2
- DDR self refresh states for various arm archs).

It also reads out the corresponding abbr(eviation) and uses the string
to draw the cpu idle occurences. This needs a short (3 letter) string
to keep the overview in the chart.

Signed-off-by: Thomas Renninger <trenn@xxxxxxx>
CC: lenb@xxxxxxxxxx
CC: linux-acpi@xxxxxxxxxxxxxxx
CC: linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx
CC: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
CC: Ingo Molnar <mingo@xxxxxxx>
CC: linux-kernel@xxxxxxxxxxxxxxx
CC: linux-perf-users@xxxxxxxxxxxxxxx
CC: linux-omap@xxxxxxxxxxxxxxx
---
tools/perf/builtin-timechart.c | 26 ++++++-
tools/perf/util/svghelper.c | 156 +++++++++++++++++++++++++++++++++++-----
2 files changed, 163 insertions(+), 19 deletions(-)

diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index 148dc5e..391e475 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -31,6 +31,7 @@
#include "util/event.h"
#include "util/session.h"
#include "util/svghelper.h"
+#include "util/debug.h"

#define SUPPORT_OLD_POWER_EVENTS 1
#define PWR_EVENT_EXIT -1
@@ -379,6 +380,10 @@ static void c_state_end(int cpu, u64 timestamp)
pwr->next = power_events;

power_events = pwr;
+ if (verbose)
+ printf("CPU: %d - start_time: %llu - end_time: %llu\n",
+ power_events->cpu, power_events->start_time,
+ power_events->end_time);
}

static void p_state_change(int cpu, u64 timestamp, u64 new_freq)
@@ -657,8 +662,25 @@ static void draw_c_p_states(void)
* two pass drawing so that the P state bars are on top of the C state blocks
*/
while (pwr) {
- if (pwr->type == CSTATE)
- svg_cstate(pwr->cpu, pwr->start_time, pwr->end_time, pwr->state);
+ if (pwr->type == CSTATE) {
+ if (verbose) {
+ printf("CPU: %d, Start: %llu, End: %llu, type:"
+ " %d\n", pwr->cpu, pwr->start_time,
+ pwr->end_time, pwr->state);
+ }
+ /* trenn: Looks like there is a dummy c-state entry of
+ * type==0, start_time==0, end_time==highest_timestamp
+ * for each CPU at the end of the list, this one should
+ * better be filtered out before -> ignore it here.
+ */
+ if ((pwr->state == 0 && pwr->start_time == 0)) {
+ pwr = pwr->next;
+ continue;
+ }
+
+ svg_cstate(pwr->cpu, pwr->start_time, pwr->end_time,
+ pwr->state);
+ }
pwr = pwr->next;
}

diff --git a/tools/perf/util/svghelper.c b/tools/perf/util/svghelper.c
index b3637db..20c02fc 100644
--- a/tools/perf/util/svghelper.c
+++ b/tools/perf/util/svghelper.c
@@ -16,8 +16,13 @@
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <linux/cpuidle.h>

#include "svghelper.h"
+#include "debug.h"

static u64 first_time, last_time;
static u64 turbo_frequency, max_freq;
@@ -43,11 +48,11 @@ static double cpu2y(int cpu)
return cpu2slot(cpu) * SLOT_MULT;
}

-static double time2pixels(u64 time)
+static double time2pixels(u64 __time)
{
double X;

- X = 1.0 * svg_page_width * (time - first_time) / (last_time - first_time);
+ X = 1.0 * svg_page_width * (__time - first_time) / (last_time - first_time);
return X;
}

@@ -107,12 +112,14 @@ void open_svg(const char *filename, int cpus, int rows, u64 start, u64 end)
fprintf(svgfile, " rect.WAITING { fill:rgb(255,214, 48); fill-opacity:0.6; stroke-width:0; stroke:rgb( 0, 0, 0); } \n");
fprintf(svgfile, " rect.cpu { fill:rgb(192,192,192); fill-opacity:0.2; stroke-width:0.5; stroke:rgb(128,128,128); } \n");
fprintf(svgfile, " rect.pstate { fill:rgb(128,128,128); fill-opacity:0.8; stroke-width:0; } \n");
- fprintf(svgfile, " rect.c1 { fill:rgb(255,214,214); fill-opacity:0.5; stroke-width:0; } \n");
- fprintf(svgfile, " rect.c2 { fill:rgb(255,172,172); fill-opacity:0.5; stroke-width:0; } \n");
- fprintf(svgfile, " rect.c3 { fill:rgb(255,130,130); fill-opacity:0.5; stroke-width:0; } \n");
- fprintf(svgfile, " rect.c4 { fill:rgb(255, 88, 88); fill-opacity:0.5; stroke-width:0; } \n");
- fprintf(svgfile, " rect.c5 { fill:rgb(255, 44, 44); fill-opacity:0.5; stroke-width:0; } \n");
- fprintf(svgfile, " rect.c6 { fill:rgb(255, 0, 0); fill-opacity:0.5; stroke-width:0; } \n");
+ fprintf(svgfile, " rect.c0 { fill:rgb(102,255,102); fill-opacity:0.5; stroke-width:0; } \n");
+ fprintf(svgfile, " rect.c1 { fill:rgb(102,255, 0); fill-opacity:0.5; stroke-width:0; } \n");
+ fprintf(svgfile, " rect.c2 { fill:rgb( 0,255,102); fill-opacity:0.5; stroke-width:0; } \n");
+ fprintf(svgfile, " rect.c3 { fill:rgb( 51,255, 51); fill-opacity:0.5; stroke-width:0; } \n");
+ fprintf(svgfile, " rect.c4 { fill:rgb( 51,255, 0); fill-opacity:0.5; stroke-width:0; } \n");
+ fprintf(svgfile, " rect.c5 { fill:rgb( 0,255, 51); fill-opacity:0.5; stroke-width:0; } \n");
+ fprintf(svgfile, " rect.c6 { fill:rgb( 0,204, 0); fill-opacity:0.5; stroke-width:0; } \n");
+ fprintf(svgfile, " rect.c7 { fill:rgb( 0,153, 0); fill-opacity:0.5; stroke-width:0; } \n");
fprintf(svgfile, " line.pstate { stroke:rgb(255,255, 0); stroke-opacity:0.8; stroke-width:2; } \n");

fprintf(svgfile, " ]]>\n </style>\n</defs>\n");
@@ -199,6 +206,81 @@ void svg_waiting(int Yslot, u64 start, u64 end)
fprintf(svgfile, "</g>\n");
}

+/* Cpuidle info from sysfs ***************************/
+struct cpuidle_state cpuidle_states[CPUIDLE_STATE_MAX];
+unsigned int cpuidle_info_max;
+
+static void debug_dump_cpuidle_states(void)
+{
+ unsigned int state;
+
+ if (cpuidle_info_max == 0) {
+ printf("No cpuidle info retrieved from /sys\n");
+ return;
+ }
+ printf("cpuidle_info_max: %u\n", cpuidle_info_max);
+ for (state = 0; state < cpuidle_info_max; state++) {
+ printf("CPUIDLE[%u]:\n", state);
+ printf("Name: %s\n", cpuidle_states[state].name);
+ printf("Abbr: %s\n", cpuidle_states[state].abbr);
+ }
+}
+static int get_sysfs_string(const char *path, char *string,
+ int max_string_size)
+{
+ int fd;
+ size_t numread, i;
+
+ fd = open(path, O_RDONLY);
+ if (fd == -1)
+ return -1;
+
+ numread = read(fd, string, max_string_size-1);
+ if (numread < 1) {
+ close(fd);
+ return -1;
+ }
+ for (i = 0; i < numread; i++)
+ if (string[i] == '\n')
+ string[i] = '\0';
+ string[numread] = '\0';
+ close(fd);
+ return 0;
+}
+
+#define PERF_CPUIDLE_SYS_PATH "/sys/devices/system/cpu/cpu0/cpuidle/state%u/"
+#define PERF_SYSFS_PATH_MAX 255
+
+/*
+ * Fills up cpuidle_states[CPUIDLE_STATE_MAX] info from
+ * /sys/devices/system/cpu/cpu0/cpuidle/stateX/ and sets cpuidle_info_max
+ * to found states
+ */
+static int retrieve_cpuidle_info(void)
+{
+ char path[PERF_SYSFS_PATH_MAX];
+ int state, ret;
+
+ for (state = 0; state < CPUIDLE_STATE_MAX; state++) {
+ snprintf(path, sizeof(path), PERF_CPUIDLE_SYS_PATH "name",
+ state);
+ ret = get_sysfs_string(path, cpuidle_states[state].name,
+ CPUIDLE_NAME_LEN + 1);
+ if (ret)
+ break;
+
+ snprintf(path, sizeof(path), PERF_CPUIDLE_SYS_PATH "abbr",
+ state);
+ ret = get_sysfs_string(path, cpuidle_states[state].abbr,
+ CPUIDLE_ABBR_LEN + 1);
+ if (ret)
+ break;
+ }
+ cpuidle_info_max = state;
+ return state;
+}
+/* Cpuidle info from sysfs ***************************/
+
static char *cpu_model(void)
{
static char cpu_m[255];
@@ -278,17 +360,33 @@ void svg_process(int cpu, u64 start, u64 end, const char *type, const char *name
fprintf(svgfile, "</g>\n");
}

+/*
+ * Svg util and kernel supported max cpuidle states may differ.
+ * Cmp. with tools/perf/utils/include/linux/cpuidle.h
+ * and include/linux/cpuidle.h
+ * Currently cpuidle kernel interface and this svg tool, both support 8 states
+ */
+#define PERF_SVG_CPUIDLE_STATE_MAX 8
+
void svg_cstate(int cpu, u64 start, u64 end, int type)
{
double width;
char style[128];
+ static bool max_states_exceed_msg;

if (!svgfile)
return;

+ if (type > PERF_SVG_CPUIDLE_STATE_MAX) {
+ if (verbose || max_states_exceed_msg == false) {
+ max_states_exceed_msg = true;
+ printf("cpuidle state (%d) exceeding max supported "
+ "states (%d).. ignoring\n",
+ type, PERF_SVG_CPUIDLE_STATE_MAX);
+ return;
+ }
+ }

- if (type > 6)
- type = 6;
sprintf(style, "c%i", type);

fprintf(svgfile, "<rect class=\"%s\" x=\"%4.8f\" width=\"%4.8f\" y=\"%4.1f\" height=\"%4.1f\"/>\n",
@@ -451,16 +549,40 @@ static void svg_legenda_box(int X, const char *text, const char *style)

void svg_legenda(void)
{
+ unsigned int cstate, offset = 500;
+ char class[3];
+
+ retrieve_cpuidle_info();
+ /* perf timechart does not implement a verbose (-v) param yet
+ remove below comment if you want to be more verbose. */
+ /* verbose = 1; */
+ if (verbose)
+ debug_dump_cpuidle_states();
+
if (!svgfile)
return;

- svg_legenda_box(0, "Running", "sample");
- svg_legenda_box(100, "Idle","rect.c1");
- svg_legenda_box(200, "Deeper Idle", "rect.c3");
- svg_legenda_box(350, "Deepest Idle", "rect.c6");
- svg_legenda_box(550, "Sleeping", "process2");
- svg_legenda_box(650, "Waiting for cpu", "waiting");
- svg_legenda_box(800, "Blocked on IO", "blocked");
+ svg_legenda_box(0, "Running", "sample");
+ svg_legenda_box(100, "Sleeping", "process2");
+ svg_legenda_box(200, "Waiting for cpu", "waiting");
+ svg_legenda_box(350, "Blocked on IO", "blocked");
+ /* trenn: Arch specific events. Only C1 exists on x86 if
+ no cpuidle driver registered. Deeper and Deepest can get
+ removed. Also C1 events may only get fired through cpuidle
+ driver at some time. */
+ if (cpuidle_info_max == 0) {
+ svg_legenda_box(500, "Idle", "c1");
+ } else {
+ for (cstate = 0; cstate < cpuidle_info_max; cstate++) {
+ sprintf(class, "c%u", cstate);
+ svg_legenda_box(offset, cpuidle_states[cstate].name,
+ class);
+ /* The box */
+ offset += 20;
+ /* The text */
+ offset += (strlen(cpuidle_states[cstate].name) * 10);
+ }
+ }
}

void svg_time_grid(void)
--
1.6.0.2

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