Commit 0e9b4c10 authored by Andrea Righi's avatar Andrea Righi Committed by Tejun Heo
Browse files

sched_ext: idle: Introduce scx_bpf_nr_node_ids() 



Similarly to scx_bpf_nr_cpu_ids(), introduce a new kfunc
scx_bpf_nr_node_ids() to expose the maximum number of NUMA nodes in the
system.

BPF schedulers can use this information together with the new node-aware
kfuncs, for example to create per-node DSQs, validate node IDs, etc.

Signed-off-by: default avatarAndrea Righi <arighi@nvidia.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 01059219

kernel/sched/ext.c

+11 −0
Original line number Diff line number Diff line
@@ -7113,6 +7113,16 @@ __bpf_kfunc void scx_bpf_cpuperf_set(s32 cpu, u32 perf) 
	}

}



/**

 * scx_bpf_nr_node_ids - Return the number of possible node IDs

 *

 * All valid node IDs in the system are smaller than the returned value.

 */

__bpf_kfunc u32 scx_bpf_nr_node_ids(void)

{

	return nr_node_ids;

}



/**

 * scx_bpf_nr_cpu_ids - Return the number of possible CPU IDs

 *
@@ -7325,6 +7335,7 @@ BTF_ID_FLAGS(func, scx_bpf_dump_bstr, KF_TRUSTED_ARGS) 
BTF_ID_FLAGS(func, scx_bpf_cpuperf_cap)

BTF_ID_FLAGS(func, scx_bpf_cpuperf_cur)

BTF_ID_FLAGS(func, scx_bpf_cpuperf_set)

BTF_ID_FLAGS(func, scx_bpf_nr_node_ids)

BTF_ID_FLAGS(func, scx_bpf_nr_cpu_ids)

BTF_ID_FLAGS(func, scx_bpf_get_possible_cpumask, KF_ACQUIRE)

BTF_ID_FLAGS(func, scx_bpf_get_online_cpumask, KF_ACQUIRE)

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

+1 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ void scx_bpf_dump_bstr(char *fmt, unsigned long long *data, u32 data_len) __ksym 
u32 scx_bpf_cpuperf_cap(s32 cpu) __ksym __weak;

u32 scx_bpf_cpuperf_cur(s32 cpu) __ksym __weak;

void scx_bpf_cpuperf_set(s32 cpu, u32 perf) __ksym __weak;

u32 scx_bpf_nr_node_ids(void) __ksym __weak;

u32 scx_bpf_nr_cpu_ids(void) __ksym __weak;

int scx_bpf_cpu_node(s32 cpu) __ksym __weak;

const struct cpumask *scx_bpf_get_possible_cpumask(void) __ksym __weak;

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

+4 −0
Original line number Diff line number Diff line
@@ -189,6 +189,10 @@ static inline bool __COMPAT_is_enq_cpu_selected(u64 enq_flags) 
 *

 * Preserve the following __COMPAT_scx_*_node macros until v6.17.

 */

#define __COMPAT_scx_bpf_nr_node_ids()						\

	(bpf_ksym_exists(scx_bpf_nr_node_ids) ?					\

	 scx_bpf_nr_node_ids() : 1U)



#define __COMPAT_scx_bpf_cpu_node(cpu)						\

	(bpf_ksym_exists(scx_bpf_cpu_node) ?					\

	 scx_bpf_cpu_node(cpu) : 0)