Utility (bcctl) usage and examples:
Usage: bcctl <cmd> [args...]
Commands:
get
gets current bc id
enter <id> [<pid>]
moves task into bc.
if no pid - moves parent task
stat <id> [<resource>]
prints stats for bc's resource.
if no resource - prints all resources
set <id> <resource> <barrier> [<limit>]
sets barrier/limit for bc's resource
if no limit - it is set equal to barrier
Resources:
kmemsize
privvmpages
physpages
Examples:
Move shell into beancounter
$ bcctl enter 1
Look statistics
$ bcctl stat 1
resource held minheld maxheld barrier limit failcnt
kmemsize 824 0 1056 65536 65536 0
privvmpages 100 0 304 2147483647 2147483647 0
physpages 40 0 150 2147483647 2147483647 0
See how reclamation work
$ bcctl set 1 physpages 200
$ memeat
$ bcctl stat 1 physpages
resource held minheld maxheld barrier limit failcnt
physpages 40 0 200 200 200 0
Now turn swap off and run memeater again
$ swapoff -a
$ memeat
Killed
$ bcctl stat 1 physpages
resource held minheld maxheld barrier limit failcnt
physpages 41 0 200 200 200 1
---
#include <sys/syscall.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
typedef unsigned int bcid_t;
#include "bc/beancounter.h"
#define get_bcid() (syscall(__NR_get_bcid))
#define set_bcid(id, pid) (syscall(__NR_set_bcid, id, pid))
#define set_bclimit(id, res, l) (syscall(__NR_set_bclimit, id, res, l))
#define get_bcstat(id, res, s) (syscall(__NR_get_bcstat, id, res, s))
static char *res_names[] = {
"kmemsize",
"privvmpages",
"physpages",
NULL,
};
static int bc_get_id(int argc, char **argv)
{
bcid_t id;
id = get_bcid();
printf("%u\n", id);
return 0;
}
static int bc_enter_id(int argc, char **argv)
{
bcid_t id;
pid_t pid;
char *end;
int ret;
if (argc < 1)
return -2;
id = strtol(argv[0], &end, 10);
if (*end != '\0')
return -2;
if (argc > 1) {
pid = strtol(argv[1], &end, 10);
if (*end != '\0')
return -2;
} else
pid = getppid();
ret = set_bcid(id, pid);
if (ret < 0)
perror("Can't set bcid");
return ret;
}
static int bc_set_parms(int argc, char **argv)
{
bcid_t id;
int res;
unsigned long limits[2];
char *end;
int ret;
if (argc < 3)
return -2;
id = strtol(argv[0], &end, 10);
if (*end != '\0')
return -2;
for (res = 0; res_names[res] != NULL; res++)
if (strcmp(res_names[res], argv[1]) == 0)
break;
if (res_names[res] == NULL)
return -2;
limits[0] = strtoul(argv[2], &end, 10);
if (*end != '\0')
return -2;
if (argc > 3) {
limits[1] = strtoul(argv[3], &end, 10);
if (*end != '\0')
return -2;
} else
limits[1] = limits[0];
ret = set_bclimit(id, res, limits);
if (ret < 0)
perror("Can't set limits");
return ret;
}
static void bc_show_stat_hdr(void)
{
printf("%-12s %10s %10s %10s %10s %10s %10s\n",
"resource",
"held",
"minheld",
"maxheld",
"barrier",
"limit",
"failcnt");
}
static int bc_show_stat(bcid_t id, int res)
{
struct bc_resource_parm parm;
int ret;
ret = get_bcstat(id, res, &parm);
if (ret < 0) {
perror("Can't get stat");
return ret;
}
printf("%-12s %10lu %10lu %10lu %10lu %10lu %10lu\n",
res_names[res],
parm.held,
parm.minheld,
parm.maxheld,
parm.barrier,
parm.limit,
parm.failcnt);
return 0;
}
static int bc_get_stat(int argc, char **argv)
{
bcid_t id;
int res, ret;
char *end;
if (argc < 1)
return -2;
id = strtol(argv[0], &end, 10);
if (*end != '\0')
return -2;
if (argc > 1) {
for (res = 0; res_names[res] != NULL; res++)
if (strcmp(res_names[res], argv[1]) == 0)
break;
if (res_names[res] == NULL)
return -2;
bc_show_stat_hdr();
return bc_show_stat(id, res);
}
bc_show_stat_hdr();
for (res = 0; res_names[res] != NULL; res++) {
ret = bc_show_stat(id, res);
if (ret < 0)
return ret;
}
return 0;
}
static struct bc_command {
char *name;
int (*cmd)(int argc, char **argv);
char *args;
char *help;
} bc_commands[] = {
{
.name = "get",
.cmd = bc_get_id,
.args = "",
.help = "gets current bc id",
},
{
.name = "enter",
.cmd = bc_enter_id,
.args = "<id> [<pid>]",
.help = "moves task into bc.\n"
"\t\tif no pid - moves parent task",
},
{
.name = "stat",
.cmd = bc_get_stat,
.args = "<id> [<resource>]",
.help = "prints stats for bc's resource.\n\t\t"
"if no resource - prints all resources",
},
{
.name = "set",
.cmd = bc_set_parms,
.args = "<id> <resource> <barrier> [<limit>]",
.help = "sets barrier/limit for bc's resource\n"
"\t\tif no limit - it is set equal to barrier",
},
{
.name = NULL,
},
};
static void usage(void)
{
int i;
printf("Usage: bcctl <cmd> [args...]\n");
printf("Commands:\n");
for (i = 0; bc_commands[i].name != NULL; i++)
printf("\t%s %s\n\t\t%s\n",
bc_commands[i].name,
bc_commands[i].args,
bc_commands[i].help);
printf("Resources:\n");
for (i = 0; res_names[i] != NULL; i++)
printf("\t%s\n", res_names[i]);
}
int main(int argc, char **argv)
{
int i, ret;
if (argc < 2) {
usage();
return 0;
}
ret = -1;
for (i = 0; bc_commands[i].name != NULL; i++) {
if (strcmp(argv[1], bc_commands[i].name) != 0)
continue;
ret = bc_commands[i].cmd(argc - 2, argv + 2);
}
if (ret < 0)
usage();
return ret;
}
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