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-rw-r--r--src/cgtop.c729
1 files changed, 729 insertions, 0 deletions
diff --git a/src/cgtop.c b/src/cgtop.c
new file mode 100644
index 0000000000..8b8617dc1c
--- /dev/null
+++ b/src/cgtop.c
@@ -0,0 +1,729 @@
+/*-*- 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 General Public License as published by
+ the Free Software Foundation; either version 2 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <alloca.h>
+#include <getopt.h>
+
+#include "util.h"
+#include "hashmap.h"
+#include "cgroup-util.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 = 2;
+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 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;
+ 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_tasks(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 = join(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)
+ return r;
+
+ r = refresh_one("cpuacct", "/", a, b, iteration, 0);
+ if (r < 0)
+ return r;
+
+ r = refresh_one("memory", "/", a, b, iteration, 0);
+ if (r < 0)
+ return r;
+
+ return refresh_one("blkio", "/", a, b, iteration, 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 (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;
+ }
+
+ 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);
+}
+
+static int display(Hashmap *a) {
+ Iterator i;
+ Group *g;
+ Group **array;
+ unsigned rows, n = 0, j;
+
+ assert(a);
+
+ /* Set cursor to top left corner and clear screen */
+ 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(array, n, sizeof(Group*), group_compare);
+
+ rows = fd_lines(STDOUT_FILENO);
+ if (rows <= 0)
+ rows = 25;
+
+ printf("%s%-37s%s %s%7s%s %s%6s%s %s%8s%s %s%8s%s %s%8s%s\n\n",
+ arg_order == ORDER_PATH ? ANSI_HIGHLIGHT_ON : "", "Path", arg_order == ORDER_PATH ? ANSI_HIGHLIGHT_OFF : "",
+ arg_order == ORDER_TASKS ? ANSI_HIGHLIGHT_ON : "", "Tasks", arg_order == ORDER_TASKS ? ANSI_HIGHLIGHT_OFF : "",
+ arg_order == ORDER_CPU ? ANSI_HIGHLIGHT_ON : "", "%CPU", arg_order == ORDER_CPU ? ANSI_HIGHLIGHT_OFF : "",
+ arg_order == ORDER_MEMORY ? ANSI_HIGHLIGHT_ON : "", "Memory", arg_order == ORDER_MEMORY ? ANSI_HIGHLIGHT_OFF : "",
+ arg_order == ORDER_IO ? ANSI_HIGHLIGHT_ON : "", "Input/s", arg_order == ORDER_IO ? ANSI_HIGHLIGHT_OFF : "",
+ arg_order == ORDER_IO ? ANSI_HIGHLIGHT_ON : "", "Output/s", arg_order == ORDER_IO ? ANSI_HIGHLIGHT_OFF : "");
+
+ for (j = 0; j < n; j++) {
+ char *p;
+ char m[FORMAT_BYTES_MAX];
+
+ if (j + 5 > rows)
+ break;
+
+ g = array[j];
+
+ p = ellipsize(g->path, 37, 33);
+ printf("%-37s", p ? p : g->path);
+ free(p);
+
+ if (g->n_tasks_valid)
+ printf(" %7u", g->n_tasks);
+ else
+ fputs(" -", stdout);
+
+ if (g->cpu_valid)
+ printf(" %6.1f", g->cpu_fraction*100);
+ else
+ fputs(" -", stdout);
+
+ if (g->memory_valid)
+ printf(" %8s", format_bytes(m, sizeof(m), g->memory));
+ else
+ fputs(" -", stdout);
+
+ if (g->io_valid) {
+ printf(" %8s",
+ format_bytes(m, sizeof(m), g->io_input_bps));
+ printf(" %8s",
+ format_bytes(m, sizeof(m), 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"
+ " -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"
+ " -d --delay=DELAY Specify delay\n"
+ " --depth=DEPTH Maximum traversal depth (default: 2)\n",
+ program_invocation_short_name);
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+ enum {
+ ARG_DEPTH = 0x100
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "delay", required_argument, NULL, 'd' },
+ { "depth", required_argument, NULL, ARG_DEPTH },
+ { NULL, 0, NULL, 0 }
+ };
+
+ int c;
+ int r;
+
+ assert(argc >= 1);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "hptcmid:", options, NULL)) >= 0) {
+
+ switch (c) {
+
+ case 'h':
+ help();
+ return 0;
+
+ 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_usec(optarg, &arg_delay);
+ if (r < 0 || arg_delay <= 0) {
+ log_error("Failed to parse delay parameter.");
+ return -EINVAL;
+ }
+
+ 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:
+ log_error("Unknown option code %c", c);
+ return -EINVAL;
+ }
+ }
+
+ 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) {
+ log_error("Out of memory");
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ 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;
+
+ 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);
+
+ 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 '+':
+ 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));
+ 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));
+ fflush(stdout);
+ sleep(1);
+ break;
+
+ case '?':
+ case 'h':
+ fprintf(stdout,
+ "\t<" ANSI_HIGHLIGHT_ON "P" ANSI_HIGHLIGHT_OFF "> By path; <" ANSI_HIGHLIGHT_ON "T" ANSI_HIGHLIGHT_OFF "> By tasks; <" ANSI_HIGHLIGHT_ON "C" ANSI_HIGHLIGHT_OFF "> By CPU; <" ANSI_HIGHLIGHT_ON "M" ANSI_HIGHLIGHT_OFF "> By memory; <" ANSI_HIGHLIGHT_ON "I" ANSI_HIGHLIGHT_OFF "> By I/O\n"
+ "\t<" ANSI_HIGHLIGHT_ON "Q" ANSI_HIGHLIGHT_OFF "> Quit; <" ANSI_HIGHLIGHT_ON "+" ANSI_HIGHLIGHT_OFF "> Increase delay; <" ANSI_HIGHLIGHT_ON "-" ANSI_HIGHLIGHT_OFF "> Decrease delay; <" ANSI_HIGHLIGHT_ON "SPACE" ANSI_HIGHLIGHT_OFF "> Refresh");
+ fflush(stdout);
+ sleep(3);
+ break;
+
+ default:
+ fprintf(stdout, "\nUnknown key '%c'. Ignoring.", key);
+ fflush(stdout);
+ sleep(1);
+ break;
+ }
+ }
+
+ log_info("Exiting.");
+
+ r = 0;
+
+finish:
+ group_hashmap_free(a);
+ group_hashmap_free(b);
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
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