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sched/ext: Add BPF function to fetch rq

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rq contains many useful fields to implement a custom scheduler. For
example, various clock signals like clock_task and clock_pelt can be
used to track load. It also contains stats in other sched_classes, which
are useful to drive scheduling decisions in ext.

tj: Put the new helper below scx_bpf_task_*() helpers.

Signed-off-by: Hongyan Xia <hongyan.xia2@arm.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Hongyan Xia 2024-07-08 15:01:18 +01:00 committed by Tejun Heo
parent 7b9f6c864a
commit 6203ef73fa
2 changed files with 14 additions and 0 deletions
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13
kernel/sched/ext.c
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@ -6113,6 +6113,18 @@ __bpf_kfunc s32 scx_bpf_task_cpu(const struct task_struct *p)
return task_cpu(p);
}
/**
* scx_bpf_cpu_rq - Fetch the rq of a CPU
* @cpu: CPU of the rq
*/
__bpf_kfunc struct rq *scx_bpf_cpu_rq(s32 cpu)
{
if (!ops_cpu_valid(cpu, NULL))
return NULL;
return cpu_rq(cpu);
}
__bpf_kfunc_end_defs();
BTF_KFUNCS_START(scx_kfunc_ids_any)
@ -6137,6 +6149,7 @@ BTF_ID_FLAGS(func, scx_bpf_pick_idle_cpu, KF_RCU)
BTF_ID_FLAGS(func, scx_bpf_pick_any_cpu, KF_RCU)
BTF_ID_FLAGS(func, scx_bpf_task_running, KF_RCU)
BTF_ID_FLAGS(func, scx_bpf_task_cpu, KF_RCU)
BTF_ID_FLAGS(func, scx_bpf_cpu_rq)
BTF_KFUNCS_END(scx_kfunc_ids_any)
static const struct btf_kfunc_id_set scx_kfunc_set_any = {

1
tools/sched_ext/include/scx/common.bpf.h
View File

@ -57,6 +57,7 @@ s32 scx_bpf_pick_idle_cpu(const cpumask_t *cpus_allowed, u64 flags) __ksym;
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;
struct rq *scx_bpf_cpu_rq(s32 cpu) __ksym;
static inline __attribute__((format(printf, 1, 2)))
void ___scx_bpf_bstr_format_checker(const char *fmt, ...) {}