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process-util: Add support SCHED_EXT scheduling policy

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Allow CPUSchedulingPolicy to be set to "ext". SCHED_EXT is a new
scheduling policy in Linux v6.12 that allows processes to be scheduled
using custom BPF schedulers instead of the default in-kernel ones.

Selectively setting the SCHED_EXT policy is useful for systems running
in "partial mode" where not all processes are run using a custom
scheduler.

Fallback to SCHED_OTHER and print an error message for systems where
SCHED_EXT isn't available.
This commit is contained in:
Matt Fleming
2025-12-20 18:31:55 +01:00
committed by Mike Yuan
parent 84dcbc3fd2
commit 4dcbfbb1ad
9 changed files with 69 additions and 10 deletions
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src/basic/process-util.h
+3
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@@ -128,7 +128,10 @@ int pid_compare_func(const pid_t *a, const pid_t *b);
bool nice_is_valid(int n) _const_;
bool sched_policy_is_valid(int i) _const_;
bool sched_policy_supported(int i);
bool sched_priority_is_valid(int i) _const_;
int sched_get_priority_min_safe(int i);
int sched_get_priority_max_safe(int i);
#define PID_AUTOMATIC ((pid_t) INT_MIN) /* special value indicating "acquire pid from connection peer" */