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Fix mapping between sched_attr and SchedPolicy

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This commit is contained in:
js2xxx
2025-06-18 11:48:11 +00:00
committed by Jianfeng Jiang
parent 0875cf6644
commit c5d57d5216
3 changed files with 50 additions and 5 deletions
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23
kernel/src/syscall/sched_getattr.rs
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@ -69,16 +69,26 @@ impl TryFrom<SchedPolicy> for LinuxSchedAttr {
..Default::default()
},
// The SCHED_IDLE policy is mapped to the highest nice value of
// `SchedPolicy::Fair` instead of `SchedPolicy::Idle`. Tasks of the
// latter policy are invisible to the user API.
SchedPolicy::Fair(Nice::MAX) => LinuxSchedAttr {
sched_policy: SCHED_IDLE,
..Default::default()
},
SchedPolicy::Fair(nice) => LinuxSchedAttr {
sched_policy: SCHED_NORMAL,
sched_nice: nice.value().get().into(),
..Default::default()
},
SchedPolicy::Idle => LinuxSchedAttr {
sched_policy: SCHED_IDLE,
..Default::default()
},
SchedPolicy::Idle => {
return Err(Error::with_message(
Errno::EACCES,
"attr for idle tasks are not accessible",
))
}
})
}
}
@ -112,7 +122,10 @@ impl TryFrom<LinuxSchedAttr> for SchedPolicy {
.map_err(|msg| Error::with_message(Errno::EINVAL, msg))?,
)),
SCHED_IDLE => SchedPolicy::Idle,
// The SCHED_IDLE policy is mapped to the highest nice value of
// `SchedPolicy::Fair` instead of `SchedPolicy::Idle`. Tasks of the
// latter policy are invisible to the user API.
SCHED_IDLE => SchedPolicy::Fair(Nice::MAX),
_ => {
return Err(Error::with_message(