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sched_ext: Add scx_bpf_task_set_slice() and scx_bpf_task_set_dsq_vtime() 

With the planned hierarchical scheduler support, sub-schedulers will need to
be verified for authority before being allowed to modify task->scx.slice and
task->scx.dsq_vtime. Add scx_bpf_task_set_slice() and
scx_bpf_task_set_dsq_vtime() which will perform the necessary permission
checks.

Root schedulers can still directly write to these fields, so this doesn't
affect existing schedulers.

Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2025-10-06 15:51:45 -10:00
parent 111a79800a
commit 3035addfaf
2 changed files with 32 additions and 0 deletions
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30
kernel/sched/ext.c
View File

@ -5936,6 +5936,34 @@ static const struct btf_kfunc_id_set scx_kfunc_set_unlocked = {
__bpf_kfunc_start_defs();
/**
* scx_bpf_task_set_slice - Set task's time slice
* @p: task of interest
* @slice: time slice to set in nsecs
*
* Set @p's time slice to @slice. Returns %true on success, %false if the
* calling scheduler doesn't have authority over @p.
*/
__bpf_kfunc bool scx_bpf_task_set_slice(struct task_struct *p, u64 slice)
{
p->scx.slice = slice;
return true;
}
/**
* scx_bpf_task_set_dsq_vtime - Set task's virtual time for DSQ ordering
* @p: task of interest
* @vtime: virtual time to set
*
* Set @p's virtual time to @vtime. Returns %true on success, %false if the
* calling scheduler doesn't have authority over @p.
*/
__bpf_kfunc bool scx_bpf_task_set_dsq_vtime(struct task_struct *p, u64 vtime)
{
p->scx.dsq_vtime = vtime;
return true;
}
static void scx_kick_cpu(struct scx_sched *sch, s32 cpu, u64 flags)
{
struct rq *this_rq;
@ -6741,6 +6769,8 @@ __bpf_kfunc void scx_bpf_events(struct scx_event_stats *events,
__bpf_kfunc_end_defs();
BTF_KFUNCS_START(scx_kfunc_ids_any)
BTF_ID_FLAGS(func, scx_bpf_task_set_slice, KF_RCU);
BTF_ID_FLAGS(func, scx_bpf_task_set_dsq_vtime, KF_RCU);
BTF_ID_FLAGS(func, scx_bpf_kick_cpu)
BTF_ID_FLAGS(func, scx_bpf_dsq_nr_queued)
BTF_ID_FLAGS(func, scx_bpf_destroy_dsq)

2
tools/sched_ext/include/scx/common.bpf.h
View File

@ -102,6 +102,8 @@ s32 scx_bpf_pick_any_cpu_node(const cpumask_t *cpus_allowed, int node, u64 flags
s32 scx_bpf_pick_any_cpu(const cpumask_t *cpus_allowed, u64 flags) __ksym;
bool scx_bpf_task_running(const struct task_struct *p) __ksym;
s32 scx_bpf_task_cpu(const struct task_struct *p) __ksym;
bool scx_bpf_task_set_slice(struct task_struct *p, u64 slice) __ksym __weak;
bool scx_bpf_task_set_dsq_vtime(struct task_struct *p, u64 vtime) __ksym __weak;
struct rq *scx_bpf_cpu_rq(s32 cpu) __ksym;
struct rq *scx_bpf_locked_rq(void) __ksym;
struct task_struct *scx_bpf_cpu_curr(s32 cpu) __ksym __weak;