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sched_ext: Refactor do_enqueue_task() local and global DSQ paths

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The local and global DSQ enqueue paths in do_enqueue_task() share the same
slice refill logic. Factor out the common code into a shared enqueue label.
This makes adding new enqueue cases easier. No functional changes.

Reviewed-by: Andrea Righi <arighi@nvidia.com>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo
2025-11-11 09:18:05 -10:00
parent bfd3749d48
commit 3546119f18
1 changed files with 12 additions and 9 deletions
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21
kernel/sched/ext.c
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@@ -1279,6 +1279,7 @@ static void do_enqueue_task(struct rq *rq, struct task_struct *p, u64 enq_flags,
{
struct scx_sched *sch = scx_root;
struct task_struct **ddsp_taskp;
struct scx_dispatch_q *dsq;
unsigned long qseq;
WARN_ON_ONCE(!(p->scx.flags & SCX_TASK_QUEUED));
@@ -1346,8 +1347,17 @@ static void do_enqueue_task(struct rq *rq, struct task_struct *p, u64 enq_flags,
direct:
direct_dispatch(sch, p, enq_flags);
return;
local_norefill:
dispatch_enqueue(sch, &rq->scx.local_dsq, p, enq_flags);
return;
local:
dsq = &rq->scx.local_dsq;
goto enqueue;
global:
dsq = find_global_dsq(sch, p);
goto enqueue;
enqueue:
/*
* For task-ordering, slice refill must be treated as implying the end
* of the current slice. Otherwise, the longer @p stays on the CPU, the
@@ -1355,14 +1365,7 @@ local:
*/
touch_core_sched(rq, p);
refill_task_slice_dfl(sch, p);
local_norefill:
dispatch_enqueue(sch, &rq->scx.local_dsq, p, enq_flags);
return;
global:
touch_core_sched(rq, p); /* see the comment in local: */
refill_task_slice_dfl(sch, p);
dispatch_enqueue(sch, find_global_dsq(sch, p), p, enq_flags);
dispatch_enqueue(sch, dsq, p, enq_flags);
}
static bool task_runnable(const struct task_struct *p)