Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
sched: Add normal_policy()
A new BPF extensible sched_class will need to dynamically change how a task
picks its sched_class. For example, if the loaded BPF scheduler progs fail,
the tasks will be forced back on CFS even if the task's policy is set to the
new sched_class. To support such mapping, add normal_policy() which wraps
testing for %SCHED_NORMAL. This doesn't cause any behavior changes.
v2: Update the description with more details on the expected use.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: David Vernet <dvernet@meta.com>
Acked-by: Josh Don <joshdon@google.com>
Acked-by: Hao Luo <haoluo@google.com>
Acked-by: Barret Rhoden <brho@google.com>
+7
-2
+1
-1
kernel/sched/fair.c
+1
-1
kernel/sched/fair.c
···
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* Batch and idle tasks do not preempt non-idle tasks (their preemption
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* is driven by the tick):
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*/
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-
if (unlikely(p->policy != SCHED_NORMAL) || !sched_feat(WAKEUP_PREEMPTION))
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+
if (unlikely(!normal_policy(p->policy)) || !sched_feat(WAKEUP_PREEMPTION))
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return;
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find_matching_se(&se, &pse);
+6
-1
kernel/sched/sched.h
+6
-1
kernel/sched/sched.h
···
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return policy == SCHED_IDLE;
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}
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+
static inline int normal_policy(int policy)
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+
{
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+
return policy == SCHED_NORMAL;
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+
}
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+
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static inline int fair_policy(int policy)
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{
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-
return policy == SCHED_NORMAL || policy == SCHED_BATCH;
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+
return normal_policy(policy) || policy == SCHED_BATCH;
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}
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static inline int rt_policy(int policy)