procps/slabtop.c

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/*
* slabtop.c - utility to display kernel slab information.
*
* Chris Rivera <cmrivera@ufl.edu>
* Robert Love <rml@tech9.net>
*
* This program is licensed under the GNU Library General Public License, v2
*
* Copyright (C) 2003 Chris Rivera
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <ncurses.h>
#include <termios.h>
#include <getopt.h>
#include <ctype.h>
#include <sys/ioctl.h>
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#include <sys/select.h>
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#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include "proc/slab.h"
#include "proc/version.h"
#define DEF_SORT_FUNC sort_nr_objs
#define SLAB_STAT_ZERO { nr_objs: 0 }
static unsigned short cols, rows;
static struct termios saved_tty;
static long delay = 3;
static int (*sort_func)(const struct slab_info *, const struct slab_info *);
static struct slab_info *merge_objs(struct slab_info *a, struct slab_info *b)
{
struct slab_info sorted_list;
struct slab_info *curr = &sorted_list;
while ((a != NULL) && (b != NULL)) {
if (sort_func(a, b)) {
curr->next = a;
curr = a;
a = a->next;
} else {
curr->next = b;
curr = b;
b = b->next;
}
}
curr->next = (a == NULL) ? b : a;
return sorted_list.next;
}
/*
* slabsort - merge sort the slab_info linked list based on sort_func
*/
static struct slab_info *slabsort(struct slab_info *list)
{
struct slab_info *a, *b;
if ((list == NULL) || (list->next == NULL))
return list;
a = list;
b = list->next;
while ((b != NULL) && (b->next != NULL)) {
list = list->next;
b = b->next->next;
}
b = list->next;
list->next = NULL;
return merge_objs(slabsort(a), slabsort(b));
}
/*
* Sort Routines. Each of these should be associated with a command-line
* search option. The functions should fit the prototype:
*
* int sort_foo(const struct slab_info *a, const struct slab_info *b)
*
* They return one if the first parameter is larger than the second
* Otherwise, they return zero.
*/
static int sort_name(const struct slab_info *a, const struct slab_info *b)
{
return (strcmp(a->name, b->name) < 0) ? 1 : 0;
}
static int sort_nr_objs(const struct slab_info *a, const struct slab_info *b)
{
return (a->nr_objs > b->nr_objs);
}
static int sort_nr_active_objs(const struct slab_info *a,
const struct slab_info *b)
{
return (a->nr_active_objs > b->nr_active_objs);
}
static int sort_obj_size(const struct slab_info *a, const struct slab_info *b)
{
return (a->obj_size > b->obj_size);
}
static int sort_objs_per_slab(const struct slab_info *a,
const struct slab_info *b)
{
return (a->objs_per_slab > b->objs_per_slab);
}
static int sort_pages_per_slab(const struct slab_info *a,
const struct slab_info *b)
{
return (a->pages_per_slab > b->pages_per_slab);
}
static int sort_nr_slabs(const struct slab_info *a, const struct slab_info *b)
{
return (a->nr_slabs > b->nr_slabs);
}
static int sort_nr_active_slabs(const struct slab_info *a,
const struct slab_info *b)
{
return (a->nr_active_slabs > b->nr_active_slabs);
}
static int sort_use(const struct slab_info *a, const struct slab_info *b)
{
return (a->use > b->use);
}
static int sort_cache_size(const struct slab_info *a, const struct slab_info *b)
{
return (a->cache_size > b->cache_size);
}
/*
* term_size - set the globals 'cols' and 'rows' to the current terminal size
*/
static void term_size(int unused)
{
struct winsize ws;
(void) unused;
if ((ioctl(1, TIOCGWINSZ, &ws) != -1) && ws.ws_row > 10) {
cols = ws.ws_col;
rows = ws.ws_row;
} else {
cols = 80;
rows = 24;
}
}
static void sigint_handler(int unused)
{
(void) unused;
delay = 0;
}
static void usage(const char *cmd)
{
fprintf(stderr, "usage: %s [options]\n\n", cmd);
fprintf(stderr, "options:\n");
fprintf(stderr, " --delay=n, -d n "
"delay n seconds between updates\n");
fprintf(stderr, " --once, -o "
"only display once, then exit\n");
fprintf(stderr, " --sort=S, -s S "
"specify sort criteria S (see below)\n");
fprintf(stderr, " --version, -V "
"display version information and exit\n");
fprintf(stderr, " --help display this help and exit\n\n");
fprintf(stderr, "The following are valid sort criteria:\n");
fprintf(stderr, " a: sort by number of active objects\n");
fprintf(stderr, " b: sort by objects per slab\n");
fprintf(stderr, " c: sort by cache size\n");
fprintf(stderr, " l: sort by number of slabs\n");
fprintf(stderr, " v: sort by number of active slabs\n");
fprintf(stderr, " n: sort by name\n");
fprintf(stderr, " o: sort by number of objects\n");
fprintf(stderr, " p: sort by pages per slab\n");
fprintf(stderr, " s: sort by object size\n");
fprintf(stderr, " u: sort by cache utilization\n");
}
/*
* set_sort_func - return the slab_sort_func that matches the given key.
* On unrecognizable key, DEF_SORT_FUNC is returned.
*/
static void * set_sort_func(char key)
{
switch (key) {
case 'n':
return sort_name;
case 'o':
return sort_nr_objs;
case 'a':
return sort_nr_active_objs;
case 's':
return sort_obj_size;
case 'b':
return sort_objs_per_slab;
case 'p':
return sort_pages_per_slab;
case 'l':
return sort_nr_slabs;
case 'v':
return sort_nr_active_slabs;
case 'c':
return sort_cache_size;
case 'u':
return sort_use;
default:
return DEF_SORT_FUNC;
}
}
static void parse_input(char c)
{
c = toupper(c);
switch(c) {
case 'A':
sort_func = sort_nr_active_objs;
break;
case 'B':
sort_func = sort_objs_per_slab;
break;
case 'C':
sort_func = sort_cache_size;
break;
case 'L':
sort_func = sort_nr_slabs;
break;
case 'V':
sort_func = sort_nr_active_slabs;
break;
case 'N':
sort_func = sort_name;
break;
case 'O':
sort_func = sort_nr_objs;
break;
case 'P':
sort_func = sort_pages_per_slab;
break;
case 'S':
sort_func = sort_obj_size;
break;
case 'U':
sort_func = sort_use;
break;
case 'Q':
delay = 0;
break;
}
}
int main(int argc, char *argv[])
{
int o;
unsigned short old_rows;
struct slab_info *slab_list = NULL;
struct option longopts[] = {
{ "delay", 1, NULL, 'd' },
{ "sort", 1, NULL, 's' },
{ "once", 0, NULL, 'o' },
{ "help", 0, NULL, 'h' },
{ "version", 0, NULL, 'V' },
{ NULL, 0, NULL, 0 }
};
sort_func = DEF_SORT_FUNC;
while ((o = getopt_long(argc, argv, "d:s:ohV", longopts, NULL)) != -1) {
int ret = 1;
switch (o) {
case 'd':
errno = 0;
delay = strtol(optarg, NULL, 10);
if (errno) {
perror("strtoul");
return 1;
}
if (delay < 0) {
fprintf(stderr, "error: can't have a "\
"negative delay\n");
exit(1);
}
break;
case 's':
sort_func = set_sort_func(optarg[0]);
break;
case 'o':
delay = 0;
break;
case 'V':
display_version();
return 0;
case 'h':
ret = 0;
default:
usage(argv[0]);
return ret;
}
}
if (tcgetattr(0, &saved_tty) == -1)
perror("tcgetattr");
initscr();
term_size(0);
old_rows = rows;
resizeterm(rows, cols);
signal(SIGWINCH, term_size);
signal(SIGINT, sigint_handler);
do {
struct slab_info *curr;
struct slab_stat stats = SLAB_STAT_ZERO;
struct timeval tv;
fd_set readfds;
char c;
int i;
if (get_slabinfo(&slab_list, &stats))
break;
if (old_rows != rows) {
resizeterm(rows, cols);
old_rows = rows;
}
move(0,0);
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printw( " Active / Total Objects (%% used) : %d / %d (%.1f%%)\n"
" Active / Total Slabs (%% used) : %d / %d (%.1f%%)\n"
" Active / Total Caches (%% used) : %d / %d (%.1f%%)\n"
" Active / Total Size (%% used) : %.2fK / %.2fK (%.1f%%)\n"
" Minimum / Average / Maximum Object : %.2fK / %.2fK / %.2fK\n\n",
stats.nr_active_objs, stats.nr_objs, 100.0 * stats.nr_active_objs / stats.nr_objs,
stats.nr_active_slabs, stats.nr_slabs, 100.0 * stats.nr_active_slabs / stats.nr_slabs,
stats.nr_active_caches, stats.nr_caches, 100.0 * stats.nr_active_caches / stats.nr_caches,
stats.active_size / 1024.0, stats.total_size / 1024.0, 100.0 * stats.active_size / stats.total_size,
stats.min_obj_size / 1024.0, stats.avg_obj_size / 1024.0, stats.max_obj_size / 1024.0
);
slab_list = slabsort(slab_list);
attron(A_REVERSE);
printw( "%6s %6s %4s %8s %6s %8s %10s %-23s\n",
"OBJS", "ACTIVE", "USE", "OBJ SIZE", "SLABS",
"OBJ/SLAB", "CACHE SIZE", "NAME");
attroff(A_REVERSE);
curr = slab_list;
for (i = 0; i < rows - 8 && curr->next; i++) {
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printw("%6u %6u %3u%% %7.2fK %6u %8u %9uK %-23s\n",
curr->nr_objs, curr->nr_active_objs, curr->use,
curr->obj_size / 1024.0, curr->nr_slabs,
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curr->objs_per_slab, (unsigned)(curr->cache_size / 1024),
curr->name);
curr = curr->next;
}
refresh();
put_slabinfo(slab_list);
FD_ZERO(&readfds);
FD_SET(0, &readfds);
tv.tv_sec = delay;
tv.tv_usec = 0;
if (select(1, &readfds, NULL, NULL, &tv) > 0) {
if (read(0, &c, 1) != 1)
break;
parse_input(c);
}
} while (delay);
tcsetattr(0, TCSAFLUSH, &saved_tty);
free_slabinfo(slab_list);
endwin();
return 0;
}