Re: [PATCH v4 sched_ext/for-7.3 07/40] tools/sched_ext: scx_qmap - Use bare u64/u32/s32 integer types

[Andrea Righi]

On Wed, Jul 08, 2026 at 11:23:56AM -1000, Tejun Heo wrote:
> scx_qmap.c and the shared scx_qmap.h mixed __u64/__u32/__s32 with the bare
> typedefs that scx/common.h provides. Convert the remaining __-prefixed
> integer types to the bare forms for consistency. The struct fields become
> bare u64 (uint64_t), so the stats printfs that fed them to %llu now cast to
> unsigned long long. No functional change.
> 
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>

Reviewed-by: Andrea Righi <arighi@xxxxxxxxxx>

Thanks,
-Andrea

> ---
>  tools/sched_ext/scx_qmap.c | 21 +++++++++++----------
>  tools/sched_ext/scx_qmap.h | 34 +++++++++++++++++-----------------
>  2 files changed, 28 insertions(+), 27 deletions(-)
> 
> diff --git a/tools/sched_ext/scx_qmap.c b/tools/sched_ext/scx_qmap.c
> index 67ddd483a4c7..f1eaebcab5dc 100644
> --- a/tools/sched_ext/scx_qmap.c
> +++ b/tools/sched_ext/scx_qmap.c
> @@ -67,8 +67,8 @@ int main(int argc, char **argv)
>  	struct scx_qmap *skel;
>  	struct bpf_link *link;
>  	struct qmap_arena *qa;
> -	__u32 test_error_cnt = 0;
> -	__u64 ecode;
> +	u32 test_error_cnt = 0;
> +	u64 ecode;
>  	int opt;
>  
>  	libbpf_set_print(libbpf_print_fn);
> @@ -202,15 +202,16 @@ int main(int argc, char **argv)
>  
>  		printf("stats  : enq=%lu dsp=%lu delta=%ld reenq/cid0=%llu/%llu deq=%llu core=%llu enq_ddsp=%llu\n",
>  		       nr_enqueued, nr_dispatched, nr_enqueued - nr_dispatched,
> -		       qa->nr_reenqueued, qa->nr_reenqueued_cid0,
> -		       qa->nr_dequeued,
> -		       qa->nr_core_sched_execed,
> -		       qa->nr_ddsp_from_enq);
> +		       (unsigned long long)qa->nr_reenqueued,
> +		       (unsigned long long)qa->nr_reenqueued_cid0,
> +		       (unsigned long long)qa->nr_dequeued,
> +		       (unsigned long long)qa->nr_core_sched_execed,
> +		       (unsigned long long)qa->nr_ddsp_from_enq);
>  		printf("         exp_local=%llu exp_remote=%llu exp_timer=%llu exp_lost=%llu\n",
> -		       qa->nr_expedited_local,
> -		       qa->nr_expedited_remote,
> -		       qa->nr_expedited_from_timer,
> -		       qa->nr_expedited_lost);
> +		       (unsigned long long)qa->nr_expedited_local,
> +		       (unsigned long long)qa->nr_expedited_remote,
> +		       (unsigned long long)qa->nr_expedited_from_timer,
> +		       (unsigned long long)qa->nr_expedited_lost);
>  		if (__COMPAT_has_ksym("scx_bpf_cidperf_cur"))
>  			printf("cpuperf: cur min/avg/max=%u/%u/%u target min/avg/max=%u/%u/%u\n",
>  			       qa->cpuperf_min,
> diff --git a/tools/sched_ext/scx_qmap.h b/tools/sched_ext/scx_qmap.h
> index d15a705d5ac5..808237540f5c 100644
> --- a/tools/sched_ext/scx_qmap.h
> +++ b/tools/sched_ext/scx_qmap.h
> @@ -28,10 +28,10 @@
>  #define SCX_QMAP_MAX_CPUS	1024
>  
>  struct cpu_ctx {
> -	__u64 dsp_idx;		/* dispatch index */
> -	__u64 dsp_cnt;		/* remaining count */
> -	__u32 avg_weight;
> -	__u32 cpuperf_target;
> +	u64 dsp_idx;		/* dispatch index */
> +	u64 dsp_cnt;		/* remaining count */
> +	u32 avg_weight;
> +	u32 cpuperf_target;
>  };
>  
>  /* Opaque to userspace; defined in scx_qmap.bpf.c. */
> @@ -40,25 +40,25 @@ struct task_ctx;
>  struct qmap_fifo {
>  	struct task_ctx __arena *head;
>  	struct task_ctx __arena *tail;
> -	__s32 idx;
> +	s32 idx;
>  };
>  
>  struct qmap_arena {
>  	/* userspace-visible stats */
> -	__u64 nr_enqueued, nr_dispatched, nr_reenqueued, nr_reenqueued_cid0;
> -	__u64 nr_dequeued, nr_ddsp_from_enq;
> -	__u64 nr_core_sched_execed;
> -	__u64 nr_expedited_local, nr_expedited_remote;
> -	__u64 nr_expedited_lost, nr_expedited_from_timer;
> -	__u64 nr_highpri_queued;
> -	__u32 test_error_cnt;
> -	__u32 cpuperf_min, cpuperf_avg, cpuperf_max;
> -	__u32 cpuperf_target_min, cpuperf_target_avg, cpuperf_target_max;
> +	u64 nr_enqueued, nr_dispatched, nr_reenqueued, nr_reenqueued_cid0;
> +	u64 nr_dequeued, nr_ddsp_from_enq;
> +	u64 nr_core_sched_execed;
> +	u64 nr_expedited_local, nr_expedited_remote;
> +	u64 nr_expedited_lost, nr_expedited_from_timer;
> +	u64 nr_highpri_queued;
> +	u32 test_error_cnt;
> +	u32 cpuperf_min, cpuperf_avg, cpuperf_max;
> +	u32 cpuperf_target_min, cpuperf_target_avg, cpuperf_target_max;
>  
>  	/* kernel-side runtime state */
> -	__u64 sub_sched_cgroup_ids[MAX_SUB_SCHEDS];
> -	__u64 core_sched_head_seqs[5];
> -	__u64 core_sched_tail_seqs[5];
> +	u64 sub_sched_cgroup_ids[MAX_SUB_SCHEDS];
> +	u64 core_sched_head_seqs[5];
> +	u64 core_sched_tail_seqs[5];
>  
>  	struct cpu_ctx cpu_ctxs[SCX_QMAP_MAX_CPUS];
>  
> -- 
> 2.54.0
>