Commit 6203ef73 authored by Hongyan Xia's avatar Hongyan Xia Committed by Tejun Heo
Browse files

sched/ext: Add BPF function to fetch rq 



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: default avatarHongyan Xia <hongyan.xia2@arm.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 7b9f6c86

kernel/sched/ext.c

+13 −0
Original line number Diff line number Diff line
@@ -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 = {

tools/sched_ext/include/scx/common.bpf.h

+1 −0
Original line number Diff line number Diff line
@@ -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, ...) {}