extern int init_system_cpuset_cgroup(void)
{
int rc;
int fstatus = SLURM_ERROR;
char* cpus = NULL;
size_t cpus_size;
char* slurm_cgpath;
xcgroup_t slurm_cg;
/* read cgroup configuration */
if (read_slurm_cgroup_conf(&slurm_cgroup_conf))
return SLURM_ERROR;
/* initialize cpuset cgroup namespace */
if (xcgroup_ns_create(&slurm_cgroup_conf, &cpuset_ns, "", "cpuset")
!= XCGROUP_SUCCESS) {
error("system cgroup: unable to create cpuset namespace");
free_slurm_cgroup_conf(&slurm_cgroup_conf);
return SLURM_ERROR;
}
/* create slurm root cg in this cg namespace */
slurm_cgpath = _system_cgroup_create_slurm_cg(&cpuset_ns);
if ( slurm_cgpath == NULL ) {
xcgroup_ns_destroy(&cpuset_ns);
free_slurm_cgroup_conf(&slurm_cgroup_conf);
return SLURM_ERROR;
}
/* check that this cgroup has cpus allowed or initialize them */
if (xcgroup_load(&cpuset_ns, &slurm_cg, slurm_cgpath)
!= XCGROUP_SUCCESS) {
error("system cgroup: unable to load slurm cpuset xcgroup");
xfree(slurm_cgpath);
xcgroup_ns_destroy(&cpuset_ns);
free_slurm_cgroup_conf(&slurm_cgroup_conf);
return SLURM_ERROR;
}
again:
snprintf(cpuset_meta, sizeof(cpuset_meta), "%scpus", cpuset_prefix);
rc = xcgroup_get_param(&slurm_cg, cpuset_meta, &cpus, &cpus_size);
if (rc != XCGROUP_SUCCESS || cpus_size == 1) {
if (!cpuset_prefix_set && (rc != XCGROUP_SUCCESS)) {
cpuset_prefix_set = 1;
cpuset_prefix = "cpuset.";
goto again;
}
/* initialize the cpusets as it was nonexistent */
if (_xcgroup_cpuset_init(&slurm_cg) != XCGROUP_SUCCESS) {
xfree(slurm_cgpath);
xcgroup_destroy(&slurm_cg);
xcgroup_ns_destroy(&cpuset_ns);
free_slurm_cgroup_conf(&slurm_cgroup_conf);
xfree(cpus);
return SLURM_ERROR;
}
}
xcgroup_destroy(&slurm_cg);
xfree(cpus);
/* build system cgroup relative path */
snprintf(system_cgroup_path, PATH_MAX, "%s/system", slurm_cgpath);
xfree(slurm_cgpath);
/* create system cgroup in the cpuset ns */
if (xcgroup_create(&cpuset_ns, &system_cpuset_cg, system_cgroup_path,
getuid(),getgid()) != XCGROUP_SUCCESS) {
goto error;
}
if (xcgroup_instantiate(&system_cpuset_cg) != XCGROUP_SUCCESS) {
goto error;
}
if (_xcgroup_cpuset_init(&system_cpuset_cg) != XCGROUP_SUCCESS) {
goto error;
}
free_slurm_cgroup_conf(&slurm_cgroup_conf);
debug("system cgroup: system cpuset cgroup initialized");
return SLURM_SUCCESS;
error:
xcgroup_unlock(&system_cpuset_cg);
xcgroup_destroy(&system_cpuset_cg);
xcgroup_ns_destroy(&cpuset_ns);
free_slurm_cgroup_conf(&slurm_cgroup_conf);
return fstatus;
}
extern int task_cgroup_cpuset_create(slurmd_job_t *job)
{
int rc;
int fstatus = SLURM_ERROR;
xcgroup_t cpuset_cg;
uint32_t jobid = job->jobid;
uint32_t stepid = job->stepid;
uid_t uid = job->uid;
uid_t gid = job->gid;
char* user_alloc_cores = NULL;
char* job_alloc_cores = NULL;
char* step_alloc_cores = NULL;
char* cpus = NULL;
size_t cpus_size;
char* slurm_cgpath ;
xcgroup_t slurm_cg;
/* create slurm root cg in this cg namespace */
slurm_cgpath = task_cgroup_create_slurm_cg(&cpuset_ns);
if ( slurm_cgpath == NULL ) {
return SLURM_ERROR;
}
/* check that this cgroup has cpus allowed or initialize them */
if (xcgroup_load(&cpuset_ns,&slurm_cg,slurm_cgpath)
!= XCGROUP_SUCCESS) {
error("task/cgroup: unable to load slurm cpuset xcgroup");
xfree(slurm_cgpath);
return SLURM_ERROR;
}
rc = xcgroup_get_param(&slurm_cg,"cpuset.cpus",&cpus,&cpus_size);
if (rc != XCGROUP_SUCCESS || cpus_size == 1) {
/* initialize the cpusets as it was inexistant */
if (_xcgroup_cpuset_init(&slurm_cg) !=
XCGROUP_SUCCESS) {
xfree(slurm_cgpath);
xcgroup_destroy(&slurm_cg);
return SLURM_ERROR;
}
}
xfree(cpus);
/* build user cgroup relative path if not set (should not be) */
if (*user_cgroup_path == '\0') {
if (snprintf(user_cgroup_path, PATH_MAX,
"%s/uid_%u", slurm_cgpath, uid) >= PATH_MAX) {
error("unable to build uid %u cgroup relative "
"path : %m", uid);
xfree(slurm_cgpath);
return SLURM_ERROR;
}
}
xfree(slurm_cgpath);
/* build job cgroup relative path if no set (should not be) */
if (*job_cgroup_path == '\0') {
if (snprintf(job_cgroup_path,PATH_MAX,"%s/job_%u",
user_cgroup_path,jobid) >= PATH_MAX) {
error("task/cgroup: unable to build job %u cpuset "
"cg relative path : %m",jobid);
return SLURM_ERROR;
}
}
/* build job step cgroup relative path (should not be) */
if (*jobstep_cgroup_path == '\0') {
if (stepid == NO_VAL) {
if (snprintf(jobstep_cgroup_path, PATH_MAX,
"%s/step_batch", job_cgroup_path)
>= PATH_MAX) {
error("task/cgroup: unable to build job step"
" %u.batch cpuset cg relative path: %m",
jobid);
return SLURM_ERROR;
}
} else {
if (snprintf(jobstep_cgroup_path, PATH_MAX, "%s/step_%u",
job_cgroup_path, stepid) >= PATH_MAX) {
error("task/cgroup: unable to build job step"
" %u.%u cpuset cg relative path: %m",
jobid, stepid);
return SLURM_ERROR;
}
}
}
/*
* create cpuset root cg and lock it
*
* we will keep the lock until the end to avoid the effect of a release
* agent that would remove an existing cgroup hierarchy while we are
* setting it up. As soon as the step cgroup is created, we can release
* the lock.
* Indeed, consecutive slurm steps could result in cg being removed
* between the next EEXIST instanciation and the first addition of
* a task. The release_agent will have to lock the root cpuset cgroup
* to avoid this scenario.
*/
if (xcgroup_create(&cpuset_ns,&cpuset_cg,"",0,0) != XCGROUP_SUCCESS) {
error("task/cgroup: unable to create root cpuset xcgroup");
return SLURM_ERROR;
}
if (xcgroup_lock(&cpuset_cg) != XCGROUP_SUCCESS) {
xcgroup_destroy(&cpuset_cg);
error("task/cgroup: unable to lock root cpuset cg");
return SLURM_ERROR;
}
/*
* build job and job steps allocated cores lists
*/
debug("task/cgroup: job abstract cores are '%s'",
job->job_alloc_cores);
debug("task/cgroup: step abstract cores are '%s'",
job->step_alloc_cores);
if (xcpuinfo_abs_to_mac(job->job_alloc_cores,
&job_alloc_cores) != XCPUINFO_SUCCESS) {
error("task/cgroup: unable to build job physical cores");
goto error;
}
if (xcpuinfo_abs_to_mac(job->step_alloc_cores,
&step_alloc_cores) != XCPUINFO_SUCCESS) {
error("task/cgroup: unable to build step physical cores");
goto error;
}
debug("task/cgroup: job physical cores are '%s'",
job->job_alloc_cores);
debug("task/cgroup: step physical cores are '%s'",
job->step_alloc_cores);
/*
* create user cgroup in the cpuset ns (it could already exist)
*/
if (xcgroup_create(&cpuset_ns,&user_cpuset_cg,
user_cgroup_path,
getuid(),getgid()) != XCGROUP_SUCCESS) {
goto error;
}
if (xcgroup_instanciate(&user_cpuset_cg) != XCGROUP_SUCCESS) {
xcgroup_destroy(&user_cpuset_cg);
goto error;
}
/*
* check that user's cpuset cgroup is consistant and add the job cores
*/
rc = xcgroup_get_param(&user_cpuset_cg,"cpuset.cpus",&cpus,&cpus_size);
if (rc != XCGROUP_SUCCESS || cpus_size == 1) {
/* initialize the cpusets as it was inexistant */
if (_xcgroup_cpuset_init(&user_cpuset_cg) !=
XCGROUP_SUCCESS) {
xcgroup_delete(&user_cpuset_cg);
xcgroup_destroy(&user_cpuset_cg);
goto error;
}
}
user_alloc_cores = xstrdup(job_alloc_cores);
if (cpus != NULL && cpus_size > 1) {
cpus[cpus_size-1]='\0';
xstrcat(user_alloc_cores,",");
xstrcat(user_alloc_cores,cpus);
}
xcgroup_set_param(&user_cpuset_cg,"cpuset.cpus",user_alloc_cores);
xfree(cpus);
/*
* create job cgroup in the cpuset ns (it could already exist)
*/
if (xcgroup_create(&cpuset_ns,&job_cpuset_cg,
job_cgroup_path,
getuid(),getgid()) != XCGROUP_SUCCESS) {
xcgroup_destroy(&user_cpuset_cg);
goto error;
}
if (xcgroup_instanciate(&job_cpuset_cg) != XCGROUP_SUCCESS) {
xcgroup_destroy(&user_cpuset_cg);
xcgroup_destroy(&job_cpuset_cg);
goto error;
}
if (_xcgroup_cpuset_init(&job_cpuset_cg) != XCGROUP_SUCCESS) {
xcgroup_destroy(&user_cpuset_cg);
xcgroup_destroy(&job_cpuset_cg);
goto error;
}
xcgroup_set_param(&job_cpuset_cg,"cpuset.cpus",job_alloc_cores);
/*
* create step cgroup in the cpuset ns (it should not exists)
* use job's user uid/gid to enable tasks cgroups creation by
* the user inside the step cgroup owned by root
*/
if (xcgroup_create(&cpuset_ns,&step_cpuset_cg,
jobstep_cgroup_path,
uid,gid) != XCGROUP_SUCCESS) {
/* do not delete user/job cgroup as */
/* they can exist for other steps */
xcgroup_destroy(&user_cpuset_cg);
xcgroup_destroy(&job_cpuset_cg);
goto error;
}
if (xcgroup_instanciate(&step_cpuset_cg) != XCGROUP_SUCCESS) {
xcgroup_destroy(&user_cpuset_cg);
xcgroup_destroy(&job_cpuset_cg);
xcgroup_destroy(&step_cpuset_cg);
goto error;
}
if (_xcgroup_cpuset_init(&step_cpuset_cg) != XCGROUP_SUCCESS) {
xcgroup_destroy(&user_cpuset_cg);
xcgroup_destroy(&job_cpuset_cg);
xcgroup_delete(&step_cpuset_cg);
xcgroup_destroy(&step_cpuset_cg);
goto error;
}
xcgroup_set_param(&step_cpuset_cg,"cpuset.cpus",step_alloc_cores);
/* attach the slurmstepd to the step cpuset cgroup */
pid_t pid = getpid();
rc = xcgroup_add_pids(&step_cpuset_cg,&pid,1);
if (rc != XCGROUP_SUCCESS) {
error("task/cgroup: unable to add slurmstepd to cpuset cg '%s'",
step_cpuset_cg.path);
fstatus = SLURM_ERROR;
} else
fstatus = SLURM_SUCCESS;
error:
xcgroup_unlock(&cpuset_cg);
xcgroup_destroy(&cpuset_cg);
xfree(user_alloc_cores);
xfree(job_alloc_cores);
xfree(step_alloc_cores);
return fstatus;
}
extern int task_cgroup_cpuset_create(stepd_step_rec_t *job)
{
int rc;
int fstatus = SLURM_ERROR;
xcgroup_t cpuset_cg;
uint32_t jobid = job->jobid;
uint32_t stepid = job->stepid;
uid_t uid = job->uid;
uid_t gid = job->gid;
char* user_alloc_cores = NULL;
char* job_alloc_cores = NULL;
char* step_alloc_cores = NULL;
char cpuset_meta[PATH_MAX];
char* cpus = NULL;
size_t cpus_size;
char* slurm_cgpath;
xcgroup_t slurm_cg;
#ifdef HAVE_NATIVE_CRAY
char expected_usage[32];
#endif
/* create slurm root cg in this cg namespace */
slurm_cgpath = task_cgroup_create_slurm_cg(&cpuset_ns);
if ( slurm_cgpath == NULL ) {
return SLURM_ERROR;
}
/* check that this cgroup has cpus allowed or initialize them */
if (xcgroup_load(&cpuset_ns,&slurm_cg,slurm_cgpath)
!= XCGROUP_SUCCESS) {
error("task/cgroup: unable to load slurm cpuset xcgroup");
xfree(slurm_cgpath);
return SLURM_ERROR;
}
again:
snprintf(cpuset_meta, sizeof(cpuset_meta), "%scpus", cpuset_prefix);
rc = xcgroup_get_param(&slurm_cg, cpuset_meta, &cpus,&cpus_size);
if (rc != XCGROUP_SUCCESS || cpus_size == 1) {
if (!cpuset_prefix_set && (rc != XCGROUP_SUCCESS)) {
cpuset_prefix_set = 1;
cpuset_prefix = "cpuset.";
goto again;
}
/* initialize the cpusets as it was inexistant */
if (_xcgroup_cpuset_init(&slurm_cg) !=
XCGROUP_SUCCESS) {
xfree(slurm_cgpath);
xcgroup_destroy(&slurm_cg);
return SLURM_ERROR;
}
}
xfree(cpus);
/* build user cgroup relative path if not set (should not be) */
if (*user_cgroup_path == '\0') {
if (snprintf(user_cgroup_path, PATH_MAX,
"%s/uid_%u", slurm_cgpath, uid) >= PATH_MAX) {
error("task/cgroup: unable to build uid %u cgroup "
"relative path : %m", uid);
xfree(slurm_cgpath);
return SLURM_ERROR;
}
}
xfree(slurm_cgpath);
/* build job cgroup relative path if no set (should not be) */
if (*job_cgroup_path == '\0') {
if (snprintf(job_cgroup_path,PATH_MAX,"%s/job_%u",
user_cgroup_path,jobid) >= PATH_MAX) {
error("task/cgroup: unable to build job %u cpuset "
"cg relative path : %m",jobid);
return SLURM_ERROR;
}
}
/* build job step cgroup relative path (should not be) */
if (*jobstep_cgroup_path == '\0') {
int cc;
if (stepid == SLURM_BATCH_SCRIPT) {
cc = snprintf(jobstep_cgroup_path, PATH_MAX,
"%s/step_batch", job_cgroup_path);
} else if (stepid == SLURM_EXTERN_CONT) {
cc = snprintf(jobstep_cgroup_path, PATH_MAX,
"%s/step_extern", job_cgroup_path);
} else {
cc = snprintf(jobstep_cgroup_path, PATH_MAX,
"%s/step_%u", job_cgroup_path, stepid);
}
if (cc >= PATH_MAX) {
error("task/cgroup: unable to build job step %u.%u "
"cpuset cg relative path: %m",
jobid, stepid);
return SLURM_ERROR;
}
}
/*
* create cpuset root cg and lock it
*
* we will keep the lock until the end to avoid the effect of a release
* agent that would remove an existing cgroup hierarchy while we are
* setting it up. As soon as the step cgroup is created, we can release
* the lock.
* Indeed, consecutive slurm steps could result in cg being removed
* between the next EEXIST instanciation and the first addition of
* a task. The release_agent will have to lock the root cpuset cgroup
* to avoid this scenario.
*/
if (xcgroup_create(&cpuset_ns,&cpuset_cg,"",0,0) != XCGROUP_SUCCESS) {
error("task/cgroup: unable to create root cpuset xcgroup");
return SLURM_ERROR;
}
if (xcgroup_lock(&cpuset_cg) != XCGROUP_SUCCESS) {
xcgroup_destroy(&cpuset_cg);
error("task/cgroup: unable to lock root cpuset cg");
return SLURM_ERROR;
}
/*
* build job and job steps allocated cores lists
*/
debug("task/cgroup: job abstract cores are '%s'",
job->job_alloc_cores);
debug("task/cgroup: step abstract cores are '%s'",
job->step_alloc_cores);
if (xcpuinfo_abs_to_mac(job->job_alloc_cores,
&job_alloc_cores) != SLURM_SUCCESS) {
error("task/cgroup: unable to build job physical cores");
goto error;
}
if (xcpuinfo_abs_to_mac(job->step_alloc_cores,
&step_alloc_cores) != SLURM_SUCCESS) {
error("task/cgroup: unable to build step physical cores");
goto error;
}
debug("task/cgroup: job physical cores are '%s'",
job_alloc_cores);
debug("task/cgroup: step physical cores are '%s'",
step_alloc_cores);
/*
* create user cgroup in the cpuset ns (it could already exist)
*/
if (xcgroup_create(&cpuset_ns,&user_cpuset_cg,
user_cgroup_path,
getuid(),getgid()) != XCGROUP_SUCCESS) {
goto error;
}
if (xcgroup_instanciate(&user_cpuset_cg) != XCGROUP_SUCCESS) {
xcgroup_destroy(&user_cpuset_cg);
goto error;
}
/*
* check that user's cpuset cgroup is consistant and add the job cores
*/
rc = xcgroup_get_param(&user_cpuset_cg, cpuset_meta, &cpus,&cpus_size);
if (rc != XCGROUP_SUCCESS || cpus_size == 1) {
/* initialize the cpusets as it was inexistant */
if (_xcgroup_cpuset_init(&user_cpuset_cg) !=
XCGROUP_SUCCESS) {
xcgroup_delete(&user_cpuset_cg);
xcgroup_destroy(&user_cpuset_cg);
goto error;
}
}
user_alloc_cores = xstrdup(job_alloc_cores);
if (cpus != NULL && cpus_size > 1) {
cpus[cpus_size-1]='\0';
xstrcat(user_alloc_cores,",");
xstrcat(user_alloc_cores,cpus);
}
xcgroup_set_param(&user_cpuset_cg, cpuset_meta, user_alloc_cores);
xfree(cpus);
/*
* create job cgroup in the cpuset ns (it could already exist)
*/
if (xcgroup_create(&cpuset_ns,&job_cpuset_cg,
job_cgroup_path,
getuid(),getgid()) != XCGROUP_SUCCESS) {
xcgroup_destroy(&user_cpuset_cg);
goto error;
}
if (xcgroup_instanciate(&job_cpuset_cg) != XCGROUP_SUCCESS) {
xcgroup_destroy(&user_cpuset_cg);
xcgroup_destroy(&job_cpuset_cg);
goto error;
}
if (_xcgroup_cpuset_init(&job_cpuset_cg) != XCGROUP_SUCCESS) {
xcgroup_destroy(&user_cpuset_cg);
xcgroup_destroy(&job_cpuset_cg);
goto error;
}
xcgroup_set_param(&job_cpuset_cg, cpuset_meta, job_alloc_cores);
/*
* create step cgroup in the cpuset ns (it should not exists)
* use job's user uid/gid to enable tasks cgroups creation by
* the user inside the step cgroup owned by root
*/
if (xcgroup_create(&cpuset_ns,&step_cpuset_cg,
jobstep_cgroup_path,
uid,gid) != XCGROUP_SUCCESS) {
/* do not delete user/job cgroup as */
/* they can exist for other steps */
xcgroup_destroy(&user_cpuset_cg);
xcgroup_destroy(&job_cpuset_cg);
goto error;
}
if (xcgroup_instanciate(&step_cpuset_cg) != XCGROUP_SUCCESS) {
xcgroup_destroy(&user_cpuset_cg);
xcgroup_destroy(&job_cpuset_cg);
xcgroup_destroy(&step_cpuset_cg);
goto error;
}
if (_xcgroup_cpuset_init(&step_cpuset_cg) != XCGROUP_SUCCESS) {
xcgroup_destroy(&user_cpuset_cg);
xcgroup_destroy(&job_cpuset_cg);
xcgroup_delete(&step_cpuset_cg);
xcgroup_destroy(&step_cpuset_cg);
goto error;
}
xcgroup_set_param(&step_cpuset_cg, cpuset_meta, step_alloc_cores);
/*
* on Cray systems, set the expected usage in bytes.
* This is used by the Cray OOM killer
*/
#ifdef HAVE_NATIVE_CRAY
snprintf(expected_usage, sizeof(expected_usage), "%"PRIu64,
(uint64_t)job->step_mem * 1024 * 1024);
xcgroup_set_param(&step_cpuset_cg, "expected_usage_in_bytes",
expected_usage);
#endif
/* attach the slurmstepd to the step cpuset cgroup */
pid_t pid = getpid();
rc = xcgroup_add_pids(&step_cpuset_cg,&pid,1);
if (rc != XCGROUP_SUCCESS) {
error("task/cgroup: unable to add slurmstepd to cpuset cg '%s'",
step_cpuset_cg.path);
fstatus = SLURM_ERROR;
} else
fstatus = SLURM_SUCCESS;
/* validate the requested cpu frequency and set it */
cpu_freq_cgroup_validate(job, step_alloc_cores);
error:
xcgroup_unlock(&cpuset_cg);
xcgroup_destroy(&cpuset_cg);
xfree(user_alloc_cores);
xfree(job_alloc_cores);
xfree(step_alloc_cores);
return fstatus;
}
