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rt-app: Add SCHED_BATCH scheduling policy support #143

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Merged
vingu-linaro merged 1 commit into from
Feb 25, 2026
+17 −7
Merged

rt-app: Add SCHED_BATCH scheduling policy support #143

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4 changes: 3 additions & 1 deletion doc/tutorial.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -208,6 +208,7 @@ otherwise the scheduling parameters will stay unchanged
* policy : String. Define the scheduling policy of the thread. default_policy
is used if not defined. Accepted value are:
- "SCHED_OTHER"
- "SCHED_BATCH"
- "SCHED_IDLE"
- "SCHED_RR"
- "SCHED_FIFO"
Expand Down Expand Up @@ -329,7 +330,8 @@ and don't do anything otherwise.
*** taskgroups

* taskgroup: String. Can be specified at task level or phase level. Currently
only SCHED_OTHER and SCHED_IDLE tasks are supported to contain taskgroup data.
only SCHED_OTHER, SCHED_BATCH and SCHED_IDLE tasks are supported to contain
taskgroup data.
Tasks with a different policy and without taskgroup data can coexist in the
setup. An empty taskgroup ("") is allowed and is interpreted as if there is
no taskgroup data given. Pre-existing parts of a taskgroup are preserved.
Expand Down
5 changes: 3 additions & 2 deletions src/rt-app.c
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Expand Up @@ -970,7 +970,7 @@ static void __set_thread_sched_other_attrs(thread_data_t *data,

tid = gettid();
sa_params.size = sizeof(struct sched_attr);
sa_params.sched_policy = SCHED_OTHER;
sa_params.sched_policy = sched_data->policy;
sa_params.sched_priority = __sched_priority(data, sched_data);
/* In the CFS case, sched_data->prio is the NICE value. */
sa_params.sched_nice = sched_data->prio;
Expand Down Expand Up @@ -1008,7 +1008,7 @@ static void _set_thread_cfs(thread_data_t *data, sched_data_t *sched_data)
(sched_data->policy != data->curr_sched_data->policy))
__set_thread_policy_priority(data, sched_data);

if (sched_data->policy == other)
if (sched_data->policy == other || sched_data->policy == batch)
__set_thread_sched_other_attrs(data, sched_data);

__log_policy_priority_change(data, sched_data);
Expand Down Expand Up @@ -1127,6 +1127,7 @@ static void set_thread_param(thread_data_t *data, sched_data_t *sched_data)
_set_thread_uclamp(data, sched_data);
break;
case other:
case batch:
case idle:
_set_thread_cfs(data, sched_data);
_set_thread_uclamp(data, sched_data);
Expand Down
7 changes: 4 additions & 3 deletions src/rt-app_parse_config.c
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Expand Up @@ -851,6 +851,7 @@ static sched_data_t *parse_sched_data(struct json_object *obj, int def_policy)
prior_def = THREAD_PRIORITY_UNCHANGED;
break;
case other:
case batch:
case idle:
prior_def = DEFAULT_THREAD_NICE;
break;
Expand Down Expand Up @@ -960,13 +961,13 @@ static void check_taskgroup_policy_dep(phase_data_t *pdata, thread_data_t *tdata

/*
* Detect policy/taskgroup misconfiguration: a task which specifies a
* taskgroup should not run in a policy other than SCHED_OTHER or
* SCHED_IDLE.
* taskgroup should not run in a policy other than SCHED_OTHER,
* SCHED_BATCH, or SCHED_IDLE.
*/
if (tdata->curr_sched_data && tdata->curr_taskgroup_data) {
policy_t policy = tdata->curr_sched_data->policy;

if (policy != other && policy != idle) {
if (policy != other && policy != batch && policy != idle) {
log_critical(PIN2 "No taskgroup support for policy %s",
policy_to_string(policy));
exit(EXIT_INV_CONFIG);
Expand Down
4 changes: 3 additions & 1 deletion src/rt-app_types.h
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Expand Up @@ -55,8 +55,9 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#define EXIT_INV_CONFIG 2
#define EXIT_INV_COMMANDLINE 3

/* SCHED_IDLE is not available if __USE_GNU is not defined */
/* SCHED_BATCH and SCHED_IDLE are not available if __USE_GNU is not defined */
#ifndef __USE_GNU
#define SCHED_BATCH 3
#define SCHED_IDLE 5
#endif

Expand All @@ -65,6 +66,7 @@ struct _thread_data_t;
typedef enum policy_t
{
other = SCHED_OTHER,
batch = SCHED_BATCH,
idle = SCHED_IDLE,
rr = SCHED_RR,
fifo = SCHED_FIFO,
Expand Down
4 changes: 4 additions & 0 deletions src/rt-app_utils.c
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Expand Up @@ -176,6 +176,8 @@ string_to_policy(const char *policy_name, policy_t *policy)
{
if (strcmp(policy_name, "SCHED_OTHER") == 0)
*policy = other;
else if (strcmp(policy_name, "SCHED_BATCH") == 0)
*policy = batch;
else if (strcmp(policy_name, "SCHED_IDLE") == 0)
*policy = idle;
else if (strcmp(policy_name, "SCHED_RR") == 0)
Expand All @@ -195,6 +197,8 @@ policy_to_string(policy_t policy)
switch (policy) {
case other:
return "SCHED_OTHER";
case batch:
return "SCHED_BATCH";
case idle:
return "SCHED_IDLE";
case rr:
Expand Down