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Systemd/src/cgtop/cgtop.c
Zbigniew Jędrzejewski-Szmek 601185b43d Unify parse_argv style 
getopt is usually good at printing out a nice error message when
commandline options are invalid. It distinguishes between an unknown
option and a known option with a missing arg. It is better to let it
do its job and not use opterr=0 unless we actually want to suppress
messages. So remove opterr=0 in the few places where it wasn't really
useful.

When an error in options is encountered, we should not print a lengthy
help() and overwhelm the user, when we know precisely what is wrong
with the commandline. In addition, since help() prints to stdout, it
should not be used except when requested with -h or --help.

Also, simplify things here and there.
2014-08-03 21:46:07 -04:00

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2012 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#define __STDC_FORMAT_MACROS
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <alloca.h>
#include <getopt.h>
#include "path-util.h"
#include "util.h"
#include "hashmap.h"
#include "cgroup-util.h"
#include "build.h"
#include "fileio.h"
typedef struct Group {
char *path;
bool n_tasks_valid:1;
bool cpu_valid:1;
bool memory_valid:1;
bool io_valid:1;
unsigned n_tasks;
unsigned cpu_iteration;
uint64_t cpu_usage;
struct timespec cpu_timestamp;
double cpu_fraction;
uint64_t memory;
unsigned io_iteration;
uint64_t io_input, io_output;
struct timespec io_timestamp;
uint64_t io_input_bps, io_output_bps;
} Group;
static unsigned arg_depth = 3;
static unsigned arg_iterations = 0;
static bool arg_batch = false;
static usec_t arg_delay = 1*USEC_PER_SEC;
static enum {
ORDER_PATH,
ORDER_TASKS,
ORDER_CPU,
ORDER_MEMORY,
ORDER_IO
} arg_order = ORDER_CPU;
static enum {
CPU_PERCENT,
CPU_TIME,
} arg_cpu_type = CPU_PERCENT;
static void group_free(Group *g) {
assert(g);
free(g->path);
free(g);
}
static void group_hashmap_clear(Hashmap *h) {
Group *g;
while ((g = hashmap_steal_first(h)))
group_free(g);
}
static void group_hashmap_free(Hashmap *h) {
group_hashmap_clear(h);
hashmap_free(h);
}
static int process(const char *controller, const char *path, Hashmap *a, Hashmap *b, unsigned iteration) {
Group *g;
int r;
FILE *f = NULL;
pid_t pid;
unsigned n;
assert(controller);
assert(path);
assert(a);
g = hashmap_get(a, path);
if (!g) {
g = hashmap_get(b, path);
if (!g) {
g = new0(Group, 1);
if (!g)
return -ENOMEM;
g->path = strdup(path);
if (!g->path) {
group_free(g);
return -ENOMEM;
}
r = hashmap_put(a, g->path, g);
if (r < 0) {
group_free(g);
return r;
}
} else {
assert_se(hashmap_move_one(a, b, path) == 0);
g->cpu_valid = g->memory_valid = g->io_valid = g->n_tasks_valid = false;
}
}
/* Regardless which controller, let's find the maximum number
* of processes in any of it */
r = cg_enumerate_processes(controller, path, &f);
if (r < 0)
return r;
n = 0;
while (cg_read_pid(f, &pid) > 0)
n++;
fclose(f);
if (n > 0) {
if (g->n_tasks_valid)
g->n_tasks = MAX(g->n_tasks, n);
else
g->n_tasks = n;
g->n_tasks_valid = true;
}
if (streq(controller, "cpuacct")) {
uint64_t new_usage;
char *p, *v;
struct timespec ts;
r = cg_get_path(controller, path, "cpuacct.usage", &p);
if (r < 0)
return r;
r = read_one_line_file(p, &v);
free(p);
if (r < 0)
return r;
r = safe_atou64(v, &new_usage);
free(v);
if (r < 0)
return r;
assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
if (g->cpu_iteration == iteration - 1) {
uint64_t x, y;
x = ((uint64_t) ts.tv_sec * 1000000000ULL + (uint64_t) ts.tv_nsec) -
((uint64_t) g->cpu_timestamp.tv_sec * 1000000000ULL + (uint64_t) g->cpu_timestamp.tv_nsec);
y = new_usage - g->cpu_usage;
if (y > 0) {
g->cpu_fraction = (double) y / (double) x;
g->cpu_valid = true;
}
}
g->cpu_usage = new_usage;
g->cpu_timestamp = ts;
g->cpu_iteration = iteration;
} else if (streq(controller, "memory")) {
char *p, *v;
r = cg_get_path(controller, path, "memory.usage_in_bytes", &p);
if (r < 0)
return r;
r = read_one_line_file(p, &v);
free(p);
if (r < 0)
return r;
r = safe_atou64(v, &g->memory);
free(v);
if (r < 0)
return r;
if (g->memory > 0)
g->memory_valid = true;
} else if (streq(controller, "blkio")) {
char *p;
uint64_t wr = 0, rd = 0;
struct timespec ts;
r = cg_get_path(controller, path, "blkio.io_service_bytes", &p);
if (r < 0)
return r;
f = fopen(p, "re");
free(p);
if (!f)
return -errno;
for (;;) {
char line[LINE_MAX], *l;
uint64_t k, *q;
if (!fgets(line, sizeof(line), f))
break;
l = strstrip(line);
l += strcspn(l, WHITESPACE);
l += strspn(l, WHITESPACE);
if (first_word(l, "Read")) {
l += 4;
q = &rd;
} else if (first_word(l, "Write")) {
l += 5;
q = &wr;
} else
continue;
l += strspn(l, WHITESPACE);
r = safe_atou64(l, &k);
if (r < 0)
continue;
*q += k;
}
fclose(f);
assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
if (g->io_iteration == iteration - 1) {
uint64_t x, yr, yw;
x = ((uint64_t) ts.tv_sec * 1000000000ULL + (uint64_t) ts.tv_nsec) -
((uint64_t) g->io_timestamp.tv_sec * 1000000000ULL + (uint64_t) g->io_timestamp.tv_nsec);
yr = rd - g->io_input;
yw = wr - g->io_output;
if (yr > 0 || yw > 0) {
g->io_input_bps = (yr * 1000000000ULL) / x;
g->io_output_bps = (yw * 1000000000ULL) / x;
g->io_valid = true;
}
}
g->io_input = rd;
g->io_output = wr;
g->io_timestamp = ts;
g->io_iteration = iteration;
}
return 0;
}
static int refresh_one(
const char *controller,
const char *path,
Hashmap *a,
Hashmap *b,
unsigned iteration,
unsigned depth) {
DIR *d = NULL;
int r;
assert(controller);
assert(path);
assert(a);
if (depth > arg_depth)
return 0;
r = process(controller, path, a, b, iteration);
if (r < 0)
return r;
r = cg_enumerate_subgroups(controller, path, &d);
if (r < 0) {
if (r == -ENOENT)
return 0;
return r;
}
for (;;) {
char *fn, *p;
r = cg_read_subgroup(d, &fn);
if (r <= 0)
goto finish;
p = strjoin(path, "/", fn, NULL);
free(fn);
if (!p) {
r = -ENOMEM;
goto finish;
}
path_kill_slashes(p);
r = refresh_one(controller, p, a, b, iteration, depth + 1);
free(p);
if (r < 0)
goto finish;
}
finish:
if (d)
closedir(d);
return r;
}
static int refresh(Hashmap *a, Hashmap *b, unsigned iteration) {
int r;
assert(a);
r = refresh_one("name=systemd", "/", a, b, iteration, 0);
if (r < 0)
if (r != -ENOENT)
return r;
r = refresh_one("cpuacct", "/", a, b, iteration, 0);
if (r < 0)
if (r != -ENOENT)
return r;
r = refresh_one("memory", "/", a, b, iteration, 0);
if (r < 0)
if (r != -ENOENT)
return r;
r = refresh_one("blkio", "/", a, b, iteration, 0);
if (r < 0)
if (r != -ENOENT)
return r;
return 0;
}
static int group_compare(const void*a, const void *b) {
const Group *x = *(Group**)a, *y = *(Group**)b;
if (path_startswith(y->path, x->path))
return -1;
if (path_startswith(x->path, y->path))
return 1;
if (arg_order == ORDER_CPU) {
if (arg_cpu_type == CPU_PERCENT) {
if (x->cpu_valid && y->cpu_valid) {
if (x->cpu_fraction > y->cpu_fraction)
return -1;
else if (x->cpu_fraction < y->cpu_fraction)
return 1;
} else if (x->cpu_valid)
return -1;
else if (y->cpu_valid)
return 1;
} else {
if (x->cpu_usage > y->cpu_usage)
return -1;
else if (x->cpu_usage < y->cpu_usage)
return 1;
}
}
if (arg_order == ORDER_TASKS) {
if (x->n_tasks_valid && y->n_tasks_valid) {
if (x->n_tasks > y->n_tasks)
return -1;
else if (x->n_tasks < y->n_tasks)
return 1;
} else if (x->n_tasks_valid)
return -1;
else if (y->n_tasks_valid)
return 1;
}
if (arg_order == ORDER_MEMORY) {
if (x->memory_valid && y->memory_valid) {
if (x->memory > y->memory)
return -1;
else if (x->memory < y->memory)
return 1;
} else if (x->memory_valid)
return -1;
else if (y->memory_valid)
return 1;
}
if (arg_order == ORDER_IO) {
if (x->io_valid && y->io_valid) {
if (x->io_input_bps + x->io_output_bps > y->io_input_bps + y->io_output_bps)
return -1;
else if (x->io_input_bps + x->io_output_bps < y->io_input_bps + y->io_output_bps)
return 1;
} else if (x->io_valid)
return -1;
else if (y->io_valid)
return 1;
}
return strcmp(x->path, y->path);
}
#define ON ANSI_HIGHLIGHT_ON
#define OFF ANSI_HIGHLIGHT_OFF
static int display(Hashmap *a) {
Iterator i;
Group *g;
Group **array;
signed path_columns;
unsigned rows, n = 0, j, maxtcpu = 0, maxtpath = 0;
char buffer[MAX3(21, FORMAT_BYTES_MAX, FORMAT_TIMESPAN_MAX)];
assert(a);
/* Set cursor to top left corner and clear screen */
if (on_tty())
fputs("\033[H"
"\033[2J", stdout);
array = alloca(sizeof(Group*) * hashmap_size(a));
HASHMAP_FOREACH(g, a, i)
if (g->n_tasks_valid || g->cpu_valid || g->memory_valid || g->io_valid)
array[n++] = g;
qsort_safe(array, n, sizeof(Group*), group_compare);
/* Find the longest names in one run */
for (j = 0; j < n; j++) {
unsigned cputlen, pathtlen;
format_timespan(buffer, sizeof(buffer), (nsec_t) (array[j]->cpu_usage / NSEC_PER_USEC), 0);
cputlen = strlen(buffer);
maxtcpu = MAX(maxtcpu, cputlen);
pathtlen = strlen(array[j]->path);
maxtpath = MAX(maxtpath, pathtlen);
}
if (arg_cpu_type == CPU_PERCENT)
snprintf(buffer, sizeof(buffer), "%6s", "%CPU");
else
snprintf(buffer, sizeof(buffer), "%*s", maxtcpu, "CPU Time");
rows = lines();
if (rows <= 10)
rows = 10;
if (on_tty()) {
path_columns = columns() - 36 - strlen(buffer);
if (path_columns < 10)
path_columns = 10;
printf("%s%-*s%s %s%7s%s %s%s%s %s%8s%s %s%8s%s %s%8s%s\n\n",
arg_order == ORDER_PATH ? ON : "", path_columns, "Path",
arg_order == ORDER_PATH ? OFF : "",
arg_order == ORDER_TASKS ? ON : "", "Tasks",
arg_order == ORDER_TASKS ? OFF : "",
arg_order == ORDER_CPU ? ON : "", buffer,
arg_order == ORDER_CPU ? OFF : "",
arg_order == ORDER_MEMORY ? ON : "", "Memory",
arg_order == ORDER_MEMORY ? OFF : "",
arg_order == ORDER_IO ? ON : "", "Input/s",
arg_order == ORDER_IO ? OFF : "",
arg_order == ORDER_IO ? ON : "", "Output/s",
arg_order == ORDER_IO ? OFF : "");
} else
path_columns = maxtpath;
for (j = 0; j < n; j++) {
char *p;
if (on_tty() && j + 5 > rows)
break;
g = array[j];
p = ellipsize(g->path, path_columns, 33);
printf("%-*s", path_columns, p ? p : g->path);
free(p);
if (g->n_tasks_valid)
printf(" %7u", g->n_tasks);
else
fputs(" -", stdout);
if (arg_cpu_type == CPU_PERCENT) {
if (g->cpu_valid)
printf(" %6.1f", g->cpu_fraction*100);
else
fputs(" -", stdout);
} else
printf(" %*s", maxtcpu, format_timespan(buffer, sizeof(buffer), (nsec_t) (g->cpu_usage / NSEC_PER_USEC), 0));
if (g->memory_valid)
printf(" %8s", format_bytes(buffer, sizeof(buffer), g->memory));
else
fputs(" -", stdout);
if (g->io_valid) {
printf(" %8s",
format_bytes(buffer, sizeof(buffer), g->io_input_bps));
printf(" %8s",
format_bytes(buffer, sizeof(buffer), g->io_output_bps));
} else
fputs(" - -", stdout);
putchar('\n');
}
return 0;
}
static void help(void) {
printf("%s [OPTIONS...]\n\n"
"Show top control groups by their resource usage.\n\n"
" -h --help Show this help\n"
" --version Print version and exit\n"
" -p Order by path\n"
" -t Order by number of tasks\n"
" -c Order by CPU load\n"
" -m Order by memory load\n"
" -i Order by IO load\n"
" --cpu[=TYPE] Show CPU usage as time or percentage (default)\n"
" -d --delay=DELAY Delay between updates\n"
" -n --iterations=N Run for N iterations before exiting\n"
" -b --batch Run in batch mode, accepting no input\n"
" --depth=DEPTH Maximum traversal depth (default: %u)\n"
, program_invocation_short_name, arg_depth);
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_DEPTH,
ARG_CPU_TYPE
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "delay", required_argument, NULL, 'd' },
{ "iterations", required_argument, NULL, 'n' },
{ "batch", no_argument, NULL, 'b' },
{ "depth", required_argument, NULL, ARG_DEPTH },
{ "cpu", optional_argument, NULL, ARG_CPU_TYPE},
{}
};
int c;
int r;
assert(argc >= 1);
assert(argv);
while ((c = getopt_long(argc, argv, "hptcmin:bd:", options, NULL)) >= 0)
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
puts(PACKAGE_STRING);
puts(SYSTEMD_FEATURES);
return 0;
case ARG_CPU_TYPE:
if (optarg) {
if (strcmp(optarg, "time") == 0)
arg_cpu_type = CPU_TIME;
else if (strcmp(optarg, "percentage") == 0)
arg_cpu_type = CPU_PERCENT;
else
return -EINVAL;
}
break;
case ARG_DEPTH:
r = safe_atou(optarg, &arg_depth);
if (r < 0) {
log_error("Failed to parse depth parameter.");
return -EINVAL;
}
break;
case 'd':
r = parse_sec(optarg, &arg_delay);
if (r < 0 || arg_delay <= 0) {
log_error("Failed to parse delay parameter.");
return -EINVAL;
}
break;
case 'n':
r = safe_atou(optarg, &arg_iterations);
if (r < 0) {
log_error("Failed to parse iterations parameter.");
return -EINVAL;
}
break;
case 'b':
arg_batch = true;
break;
case 'p':
arg_order = ORDER_PATH;
break;
case 't':
arg_order = ORDER_TASKS;
break;
case 'c':
arg_order = ORDER_CPU;
break;
case 'm':
arg_order = ORDER_MEMORY;
break;
case 'i':
arg_order = ORDER_IO;
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
if (optind < argc) {
log_error("Too many arguments.");
return -EINVAL;
}
return 1;
}
int main(int argc, char *argv[]) {
int r;
Hashmap *a = NULL, *b = NULL;
unsigned iteration = 0;
usec_t last_refresh = 0;
bool quit = false, immediate_refresh = false;
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
a = hashmap_new(string_hash_func, string_compare_func);
b = hashmap_new(string_hash_func, string_compare_func);
if (!a || !b) {
r = log_oom();
goto finish;
}
signal(SIGWINCH, columns_lines_cache_reset);
if (!on_tty())
arg_iterations = 1;
while (!quit) {
Hashmap *c;
usec_t t;
char key;
char h[FORMAT_TIMESPAN_MAX];
t = now(CLOCK_MONOTONIC);
if (t >= last_refresh + arg_delay || immediate_refresh) {
r = refresh(a, b, iteration++);
if (r < 0)
goto finish;
group_hashmap_clear(b);
c = a;
a = b;
b = c;
last_refresh = t;
immediate_refresh = false;
}
r = display(b);
if (r < 0)
goto finish;
if (arg_iterations && iteration >= arg_iterations)
break;
if (arg_batch) {
usleep(last_refresh + arg_delay - t);
} else {
r = read_one_char(stdin, &key,
last_refresh + arg_delay - t, NULL);
if (r == -ETIMEDOUT)
continue;
if (r < 0) {
log_error("Couldn't read key: %s", strerror(-r));
goto finish;
}
}
fputs("\r \r", stdout);
fflush(stdout);
if (arg_batch)
continue;
switch (key) {
case ' ':
immediate_refresh = true;
break;
case 'q':
quit = true;
break;
case 'p':
arg_order = ORDER_PATH;
break;
case 't':
arg_order = ORDER_TASKS;
break;
case 'c':
arg_order = ORDER_CPU;
break;
case 'm':
arg_order = ORDER_MEMORY;
break;
case 'i':
arg_order = ORDER_IO;
break;
case '%':
arg_cpu_type = arg_cpu_type == CPU_TIME ? CPU_PERCENT : CPU_TIME;
break;
case '+':
if (arg_delay < USEC_PER_SEC)
arg_delay += USEC_PER_MSEC*250;
else
arg_delay += USEC_PER_SEC;
fprintf(stdout, "\nIncreased delay to %s.", format_timespan(h, sizeof(h), arg_delay, 0));
fflush(stdout);
sleep(1);
break;
case '-':
if (arg_delay <= USEC_PER_MSEC*500)
arg_delay = USEC_PER_MSEC*250;
else if (arg_delay < USEC_PER_MSEC*1250)
arg_delay -= USEC_PER_MSEC*250;
else
arg_delay -= USEC_PER_SEC;
fprintf(stdout, "\nDecreased delay to %s.", format_timespan(h, sizeof(h), arg_delay, 0));
fflush(stdout);
sleep(1);
break;
case '?':
case 'h':
fprintf(stdout,
"\t<" ON "p" OFF "> By path; <" ON "t" OFF "> By tasks; <" ON "c" OFF "> By CPU; <" ON "m" OFF "> By memory; <" ON "i" OFF "> By I/O\n"
"\t<" ON "+" OFF "> Increase delay; <" ON "-" OFF "> Decrease delay; <" ON "%%" OFF "> Toggle time\n"
"\t<" ON "q" OFF "> Quit; <" ON "SPACE" OFF "> Refresh");
fflush(stdout);
sleep(3);
break;
default:
fprintf(stdout, "\nUnknown key '%c'. Ignoring.", key);
fflush(stdout);
sleep(1);
break;
}
}
r = 0;
finish:
group_hashmap_free(a);
group_hashmap_free(b);
if (r < 0) {
log_error("Exiting with failure: %s", strerror(-r));
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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