int CgroupLimits::set_cpu_shares(uint64_t shares)
{
if (!m_cgroup.isValid() || !CgroupManager::getInstance().isMounted(CgroupManager::CPU_CONTROLLER)) {
dprintf(D_ALWAYS, "Unable to set CPU shares because cgroup is invalid.\n");
return 1;
}
int err;
struct cgroup *cpucg = &m_cgroup.getCgroup();
struct cgroup_controller *cpu_controller;
if ((cpu_controller = cgroup_get_controller(cpucg, CPU_CONTROLLER_STR)) == NULL) {
dprintf(D_ALWAYS,
"Unable to add cgroup CPU controller for %s.\n",
m_cgroup_string.c_str());
return 1;
} else if ((err = cgroup_set_value_uint64(cpu_controller, "cpu.shares", shares))) {
dprintf(D_ALWAYS,
"Unable to set CPU shares for %s: %u %s\n",
m_cgroup_string.c_str(), err, cgroup_strerror(err));
return 1;
} else {
TemporaryPrivSentry sentry(PRIV_ROOT);
if ((err = cgroup_modify_cgroup(cpucg))) {
dprintf(D_ALWAYS,
"Unable to commit CPU shares for %s"
": %u %s\n",
m_cgroup_string.c_str(), err, cgroup_strerror(err));
return 1;
}
}
return 0;
}
int
ProcFamily::set_cgroup(const std::string &cgroup_string)
{
if (cgroup_string == "/") {
dprintf(D_ALWAYS,
"Cowardly refusing to monitor the root cgroup out "
"of security concerns.\n");
return 1;
}
// Ignore this command if we've done this before.
if (m_cgroup.isValid()) {
if (cgroup_string == m_cgroup.getCgroupString()) {
return 0;
} else {
m_cgroup.destroy();
}
}
dprintf(D_PROCFAMILY, "Setting cgroup to %s for ProcFamily %u.\n",
cgroup_string.c_str(), m_root_pid);
m_cm.create(cgroup_string, m_cgroup, CgroupManager::ALL_CONTROLLERS, CgroupManager::NO_CONTROLLERS);
m_cgroup_string = m_cgroup.getCgroupString();
if (!m_cgroup.isValid()) {
return 1;
}
// Now that we have a cgroup, let's move all the existing processes to it
ProcFamilyMember* member = m_member_list;
while (member != NULL) {
migrate_to_cgroup(member->get_proc_info()->pid);
member = member->m_next;
}
// Record the amount of pre-existing CPU usage here.
m_initial_user_cpu = 0;
m_initial_sys_cpu = 0;
get_cpu_usage_cgroup(m_initial_user_cpu, m_initial_sys_cpu);
// Reset block IO controller
if (m_cm.isMounted(CgroupManager::BLOCK_CONTROLLER)) {
struct cgroup *tmp_cgroup = cgroup_new_cgroup(m_cgroup_string.c_str());
struct cgroup_controller *blkio_controller = cgroup_add_controller(tmp_cgroup, BLOCK_CONTROLLER_STR);
ASSERT (blkio_controller != NULL); // Block IO controller should already exist.
cgroup_add_value_uint64(blkio_controller, "blkio.reset_stats", 0);
int err;
if ((err = cgroup_modify_cgroup(tmp_cgroup))) {
// Not allowed to reset stats?
dprintf(D_ALWAYS,
"Unable to reset cgroup %s block IO statistics. "
"Some block IO accounting will be inaccurate (ProcFamily %u): %u %s\n",
m_cgroup_string.c_str(), m_root_pid, err, cgroup_strerror(err));
}
cgroup_free(&tmp_cgroup);
}
return 0;
}
int CgroupLimits::set_blockio_weight(uint64_t weight)
{
if (!m_cgroup.isValid() || !CgroupManager::getInstance().isMounted(CgroupManager::BLOCK_CONTROLLER)) {
dprintf(D_ALWAYS, "Unable to set blockio weight because cgroup is invalid.\n");
return 1;
}
int err;
struct cgroup *blkiocg = &m_cgroup.getCgroup();
struct cgroup_controller *blkio_controller;
if ((blkio_controller = cgroup_get_controller(blkiocg, BLOCK_CONTROLLER_STR)) == NULL) {
dprintf(D_ALWAYS,
"Unable to get cgroup block IO controller for %s.\n",
m_cgroup_string.c_str());
return 1;
} else if ((err = cgroup_set_value_uint64(blkio_controller, "blkio.weight", weight))) {
dprintf(D_ALWAYS,
"Unable to set block IO weight for %s: %u %s\n",
m_cgroup_string.c_str(), err, cgroup_strerror(err));
return 1;
} else {
TemporaryPrivSentry sentry(PRIV_ROOT);
if ((err = cgroup_modify_cgroup(blkiocg))) {
dprintf(D_ALWAYS,
"Unable to commit block IO weight for %s"
": %u %s\n",
m_cgroup_string.c_str(), err, cgroup_strerror(err));
return 1;
}
}
return 0;
}
int
ProcFamily::freezer_cgroup(const char * state)
{
// According to kernel docs, freezer will either succeed
// or return EBUSY in the errno.
//
// This function either returns 0 (success), a positive value (fatal error)
// or -EBUSY.
int err = 0;
struct cgroup_controller* freezer;
struct cgroup *cgroup = cgroup_new_cgroup(m_cgroup_string.c_str());
ASSERT (cgroup != NULL);
if (!m_cm.isMounted(CgroupManager::FREEZE_CONTROLLER)) {
err = 1;
goto ret;
}
freezer = cgroup_add_controller(cgroup, FREEZE_CONTROLLER_STR);
if (NULL == freezer) {
dprintf(D_ALWAYS,
"Unable to access the freezer subsystem for ProcFamily %u "
"for cgroup %s\n",
m_root_pid, m_cgroup_string.c_str());
err = 2;
goto ret;
}
if ((err = cgroup_add_value_string(freezer, "freezer.state", state))) {
dprintf(D_ALWAYS,
"Unable to write %s to freezer for cgroup %s (ProcFamily %u). %u %s\n",
state, m_cgroup_string.c_str(), m_root_pid, err, cgroup_strerror(err));
err = 3;
goto ret;
}
if ((err = cgroup_modify_cgroup(cgroup))) {
if (ECGROUPVALUENOTEXIST == err) {
dprintf(D_ALWAYS,
"Does not appear condor_procd is allowed to freeze"
" cgroup %s (ProcFamily %u).\n",
m_cgroup_string.c_str(), m_root_pid);
} else if ((ECGOTHER == err) && (EBUSY == cgroup_get_last_errno())) {
dprintf(D_ALWAYS, "Kernel was unable to freeze cgroup %s "
"(ProcFamily %u) due to process state; signal delivery "
"won't be atomic\n", m_cgroup_string.c_str(), m_root_pid);
err = -EBUSY;
} else {
dprintf(D_ALWAYS,
"Unable to commit freezer change %s for cgroup %s (ProcFamily %u). %u %s\n",
state, m_cgroup_string.c_str(), m_root_pid, err, cgroup_strerror(err));
}
err = 4;
goto ret;
}
ret:
cgroup_free(&cgroup);
return err;
}
static int l_cgroup_modify_cgroup (lua_State *L)
{
struct u_cgroup *cg = check_cgroup(L, 1);
int para = lua_tointeger(L, 2);
int rv = 0;
if (cg) {
rv = cgroup_modify_cgroup(cg->group);
lua_pushinteger(L, rv);
return 1;
}
lua_pushstring(L, "Not a valid cgroup");
lua_error (L);
return 0;
}
int CgroupLimits::set_memory_limit_bytes(uint64_t mem_bytes, bool soft)
{
if (!m_cgroup.isValid() || !CgroupManager::getInstance().isMounted(CgroupManager::MEMORY_CONTROLLER)) {
dprintf(D_ALWAYS, "Unable to set memory limit because cgroup is invalid.\n");
return 1;
}
int err;
struct cgroup_controller * mem_controller;
const char * limit = soft ? mem_soft_limit : mem_hard_limit;
dprintf(D_ALWAYS, "Limitting memory usage to %ld bytes\n", mem_bytes);
struct cgroup *memcg = &m_cgroup.getCgroup();
if ((mem_controller = cgroup_get_controller(memcg, MEMORY_CONTROLLER_STR)) == NULL) {
dprintf(D_ALWAYS,
"Unable to get cgroup memory controller for %s.\n",
m_cgroup_string.c_str());
return 1;
} else if ((err = cgroup_set_value_uint64(mem_controller, limit, mem_bytes))) {
dprintf(D_ALWAYS,
"Unable to set memory soft limit for %s: %u %s\n",
m_cgroup_string.c_str(), err, cgroup_strerror(err));
return 1;
} else {
TemporaryPrivSentry sentry(PRIV_ROOT);
if ((err = cgroup_modify_cgroup(memcg))) {
dprintf(D_ALWAYS,
"Unable to commit memory soft limit for %s "
": %u %s\n",
m_cgroup_string.c_str(), err, cgroup_strerror(err));
return 1;
}
}
return 0;
}
int
ProcFamily::migrate_to_cgroup(pid_t pid)
{
// Attempt to migrate a given process to a cgroup.
// This can be done without regards to whether the
// process is already in the cgroup
if (!m_cgroup.isValid()) {
return 1;
}
// We want to make sure task migration is turned on for the
// associated memory controller. So, we get to look up the original cgroup.
//
// If there is no memory controller present, we skip all this and just attempt a migrate
int err;
u_int64_t orig_migrate;
bool changed_orig = false;
char * orig_cgroup_string = NULL;
struct cgroup * orig_cgroup;
struct cgroup_controller * memory_controller;
if (m_cm.isMounted(CgroupManager::MEMORY_CONTROLLER) && (err = cgroup_get_current_controller_path(pid, MEMORY_CONTROLLER_STR, &orig_cgroup_string))) {
dprintf(D_PROCFAMILY,
"Unable to determine current memory cgroup for PID %u (ProcFamily %u): %u %s\n",
pid, m_root_pid, err, cgroup_strerror(err));
return 1;
}
// We will migrate the PID to the new cgroup even if it is in the proper memory controller cgroup
// It is possible for the task to be in multiple cgroups.
if (m_cm.isMounted(CgroupManager::MEMORY_CONTROLLER) && (orig_cgroup_string != NULL) && (strcmp(m_cgroup_string.c_str(), orig_cgroup_string))) {
// Yes, there are race conditions here - can't really avoid this.
// Throughout this block, we can assume memory controller exists.
// Get original value of migrate.
orig_cgroup = cgroup_new_cgroup(orig_cgroup_string);
ASSERT (orig_cgroup != NULL);
if ((err = cgroup_get_cgroup(orig_cgroup))) {
dprintf(D_PROCFAMILY,
"Unable to read original cgroup %s (ProcFamily %u): %u %s\n",
orig_cgroup_string, m_root_pid, err, cgroup_strerror(err));
goto after_migrate;
}
if ((memory_controller = cgroup_get_controller(orig_cgroup, MEMORY_CONTROLLER_STR)) == NULL) {
cgroup_free(&orig_cgroup);
goto after_migrate;
}
if ((err = cgroup_get_value_uint64(memory_controller, "memory.move_charge_at_immigrate", &orig_migrate))) {
if (err == ECGROUPVALUENOTEXIST) {
// Older kernels don't have the ability to migrate memory accounting to the new cgroup.
dprintf(D_PROCFAMILY,
"This kernel does not support memory usage migration; cgroup %s memory statistics"
" will be slightly incorrect (ProcFamily %u)\n",
m_cgroup_string.c_str(), m_root_pid);
} else {
dprintf(D_PROCFAMILY,
"Unable to read cgroup %s memory controller settings for "
"migration (ProcFamily %u): %u %s\n",
orig_cgroup_string, m_root_pid, err, cgroup_strerror(err));
}
cgroup_free(&orig_cgroup);
goto after_migrate;
}
if (orig_migrate != 3) {
orig_cgroup = cgroup_new_cgroup(orig_cgroup_string);
memory_controller = cgroup_add_controller(orig_cgroup, MEMORY_CONTROLLER_STR);
ASSERT (memory_controller != NULL); // Memory controller must already exist
cgroup_add_value_uint64(memory_controller, "memory.move_charge_at_immigrate", 3);
if ((err = cgroup_modify_cgroup(orig_cgroup))) {
// Not allowed to change settings
dprintf(D_ALWAYS,
"Unable to change cgroup %s memory controller settings for migration. "
"Some memory accounting will be inaccurate (ProcFamily %u): %u %s\n",
orig_cgroup_string, m_root_pid, err, cgroup_strerror(err));
} else {
changed_orig = true;
}
}
cgroup_free(&orig_cgroup);
}
after_migrate:
orig_cgroup = NULL;
err = cgroup_attach_task_pid(& const_cast<struct cgroup &>(m_cgroup.getCgroup()), pid);
if (err) {
dprintf(D_PROCFAMILY,
"Cannot attach pid %u to cgroup %s for ProcFamily %u: %u %s\n",
pid, m_cgroup_string.c_str(), m_root_pid, err, cgroup_strerror(err));
}
if (changed_orig) {
if ((orig_cgroup = cgroup_new_cgroup(orig_cgroup_string))) {
goto after_restore;
}
if (((memory_controller = cgroup_add_controller(orig_cgroup, MEMORY_CONTROLLER_STR)) != NULL) &&
(!cgroup_add_value_uint64(memory_controller, "memory.move_charge_at_immigrate", orig_migrate))) {
cgroup_modify_cgroup(orig_cgroup);
}
cgroup_free(&orig_cgroup);
}
after_restore:
if (orig_cgroup_string != NULL) {
free(orig_cgroup_string);
}
return err;
}
int container_apply_config(envid_t veid, enum conf_files c, void *_val)
{
struct cgroup *ct;
char cgrp[CT_MAX_STR_SIZE];
struct cgroup_controller *mem, *cpu, *cpuset;
int ret = -EINVAL;
unsigned long *val = _val;
veid_to_name(cgrp, veid);
ct = cgroup_new_cgroup(cgrp);
/*
* We should really be doing some thing like:
*
* ret = cgroup_get_cgroup(ct);
*
* and then doing cgroup_get_controller. However, libcgroup has
* a very nasty bug that make it sometimes fail. adding a controller
* to a newly "created" cgroup structure and then setting the value
* is a workaround that seems to work on various versions of the
* library
*/
switch (c) {
case MEMORY:
if ((mem = cgroup_add_controller(ct, "memory")))
ret = cgroup_set_value_uint64(mem, MEMLIMIT, *val);
break;
case SWAP:
/* Unlike kmem, this must always be greater than mem */
if ((mem = cgroup_add_controller(ct, "memory"))) {
u_int64_t mval;
if (!cgroup_get_value_uint64(mem, MEMLIMIT, &mval))
ret = cgroup_set_value_uint64(mem, SWAPLIMIT,
mval + *val);
}
break;
case KMEMORY:
if ((mem = cgroup_add_controller(ct, "memory")))
ret = cgroup_set_value_uint64(mem, KMEMLIMIT, *val);
break;
case TCP:
if ((mem = cgroup_add_controller(ct, "memory")))
ret = cgroup_set_value_uint64(mem, TCPLIMIT, *val);
break;
case CPULIMIT: {
u_int64_t period;
u_int64_t quota;
if ((cpu = cgroup_add_controller(ct, "cpu")) == NULL)
break;
/* Should be 100000, but be safe. It may fail on some versions
* of libcgroup, so if it fails, just assume the default */
ret = cgroup_get_value_uint64(cpu, "cpu.cfs_period_us", &period);
if (ret)
period = 100000;
/* val will contain an integer percentage, like 223% */
quota = (period * (*val)) / 100;
ret = cgroup_set_value_uint64(cpu, "cpu.cfs_quota_us", quota);
break;
}
case CPUSHARES:
if ((cpu = cgroup_add_controller(ct, "cpu")) == NULL)
break;
ret = cgroup_set_value_uint64(cpu, "cpu.shares", *val);
break;
case CPUMASK: {
struct cgroup_controller *pcont;
struct cgroup *parent;
char *ptr = NULL;
char cpusetstr[2 * CPUMASK_NBITS];
unsigned int i;
if ((cpuset = cgroup_add_controller(ct, "cpuset")) == NULL)
break;
/*
* Having all bits set is a bit different, bitmap_snprintf will
* return a bad string. (From the PoV of the cpuset cgroup). We
* actually need to copy the parent's mask in that case.
*/
for (i = 0; i < CPUMASK_NBYTES; i++) {
if (val[i] != (~0UL)) {
bitmap_snprintf(cpusetstr, CPUMASK_NBITS * 2,
val, CPUMASK_NBITS);
goto string_ok;
}
}
parent = cgroup_new_cgroup(CT_BASE_STRING);
cgroup_get_cgroup(parent);
pcont = cgroup_get_controller(parent, "cpuset");
ret = cgroup_get_value_string(pcont, "cpuset.cpus", &ptr);
if (ptr) {
strncpy(cpusetstr, ptr, CPUMASK_NBITS *2);
free(ptr);
}
cgroup_free(&parent);
string_ok:
ret = cgroup_set_value_string(cpuset, "cpuset.cpus", cpusetstr);
break;
}
case DEVICES_DENY: {
struct cgroup_controller *dev;
if ((dev = cgroup_add_controller(ct, "devices")) == NULL)
break;
ret = cgroup_set_value_string(dev, "devices.deny", (char *)_val);
break;
}
case DEVICES_ALLOW: {
struct cgroup_controller *dev;
if ((dev = cgroup_add_controller(ct, "devices")) == NULL)
break;
ret = cgroup_set_value_string(dev, "devices.allow", (char *)_val);
break;
}
default:
ret = -EINVAL;
break;
}
if (ret)
goto out;
if ((ret = cgroup_modify_cgroup(ct)))
logger(-1, 0, "Failed to set limits for %s (%s)", conf_names[c],
cgroup_strerror(ret));
out:
cgroup_free(&ct);
return ret;
}
int create_container(envid_t veid)
{
char cgrp[CT_MAX_STR_SIZE];
struct cgroup *ct, *parent;
int ret;
unsigned int i;
const char *devices[] = { "c *:* m", /* everyone can mknod */
"b *:* m", /* block devices too */
"c 1:3 rmw", /* null */
"c 1:5 rmw", /* zero */
"c 1:7 rmw", /* full */
"c 1:8 rmw", /* random */
"c 1:9 rmw", /* urandom */
"c 5:2 rmw", /* ptmx */
"c 136:* rmw", /* various pts */
};
veid_to_name(cgrp, veid);
ct = cgroup_new_cgroup(cgrp);
parent = cgroup_new_cgroup("/");
ret = do_create_container(ct, parent);
cgroup_free(&ct);
cgroup_free(&parent);
/*
* FIXME: This is yet another hack required by libcgroup. At some point
* in time, this MUST go away.
*
* Problem is that libcgroup works with buffered writes. If we write to
* a cgroup file and want it to be seen in the filesystem, we need to
* call cgroup_modify_cgroup().
*
* However, all versions up to 0.38 will fail that operation for already
* existent cgroups, due to a bug in the way they handle modifications
* in the presence of read-only files (whether or not that specific file
* was being modified). Because of that, we need to come up with a new
* cgroup all the time, and free it afterwards.
*/
for (i = 0; i < ARRAY_SIZE(devices); i++) {
struct cgroup_controller *dev;
veid_to_name(cgrp, veid);
ct = cgroup_new_cgroup(cgrp);
if ((dev = cgroup_add_controller(ct, "devices"))) {
cgroup_set_value_string(dev, "devices.allow", devices[i]);
if ((ret = cgroup_modify_cgroup(ct))) {
logger(-1, 0, "Failed to set device permissions for %s (%s)",
devices[i], cgroup_strerror(ret));
}
} else {
logger(-1, 0, "Failed to attach device controller (%s)",
cgroup_strerror(ret));
}
cgroup_free(&ct);
}
return ret;
}
