tools/sched_ext/scx_qmap.c

Source file repositories/reference/linux-study-clean/tools/sched_ext/scx_qmap.c

File Facts

System
Linux kernel
Corpus path
tools/sched_ext/scx_qmap.c
Extension
.c
Size
7041 bytes
Lines
234
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

switch (opt) {
		case 's':
			skel->rodata->slice_ns = strtoull(optarg, NULL, 0) * 1000;
			break;
		case 'e':
			test_error_cnt = strtoul(optarg, NULL, 0);
			break;
		case 't':
			skel->rodata->stall_user_nth = strtoul(optarg, NULL, 0);
			break;
		case 'T':
			skel->rodata->stall_kernel_nth = strtoul(optarg, NULL, 0);
			break;
		case 'l':
			skel->rodata->dsp_inf_loop_after = strtoul(optarg, NULL, 0);
			break;
		case 'b':
			skel->rodata->dsp_batch = strtoul(optarg, NULL, 0);
			break;
		case 'N':
			skel->rodata->max_tasks = strtoul(optarg, NULL, 0);
			break;
		case 'P':
			skel->rodata->print_dsqs_and_events = true;
			break;
		case 'M':
			skel->rodata->print_msgs = true;
			break;
		case 'H':
			skel->rodata->highpri_boosting = true;
			break;
		case 'c': {
			struct stat st;
			if (stat(optarg, &st) < 0) {
				perror("stat");
				return 1;
			}
			skel->struct_ops.qmap_ops->sub_cgroup_id = st.st_ino;
			skel->rodata->sub_cgroup_id = st.st_ino;
			break;
		}
		case 'd':
			skel->rodata->disallow_tgid = strtol(optarg, NULL, 0);
			if (skel->rodata->disallow_tgid < 0)
				skel->rodata->disallow_tgid = getpid();
			break;
		case 'D':
			skel->struct_ops.qmap_ops->exit_dump_len = strtoul(optarg, NULL, 0);
			break;
		case 'S':
			skel->rodata->suppress_dump = true;
			break;
		case 'p':
			skel->struct_ops.qmap_ops->flags |= SCX_OPS_SWITCH_PARTIAL;
			break;
		case 'I':
			skel->rodata->always_enq_immed = true;
			skel->struct_ops.qmap_ops->flags |= SCX_OPS_ALWAYS_ENQ_IMMED;
			break;
		case 'F':
			skel->rodata->immed_stress_nth = strtoul(optarg, NULL, 0);
			break;
		case 'C': {
			u32 nr_cpus = libbpf_num_possible_cpus();
			u32 mode, i;

			if (!strcmp(optarg, "shuffle"))
				mode = 1;
			else if (!strcmp(optarg, "bad-dup"))
				mode = 2;
			else if (!strcmp(optarg, "bad-range"))
				mode = 3;
			else {
				fprintf(stderr, "unknown cid-override mode '%s'\n", optarg);
				return 1;
			}
			skel->rodata->cid_override_mode = mode;

			/* shuffle: reversed cpu_to_cid, bad-dup: dup cid 0, bad-range: identity */
			for (i = 0; i < nr_cpus; i++) {
				if (mode == 1)
					skel->bss->cid_override_cpu_to_cid[i] = nr_cpus - 1 - i;
				else
					skel->bss->cid_override_cpu_to_cid[i] = i;
			}
			if (mode == 2 && nr_cpus >= 2)
				skel->bss->cid_override_cpu_to_cid[1] = 0;
			if (mode == 3)
				skel->bss->cid_override_cpu_to_cid[0] = (s32)nr_cpus;
			break;

Annotation

Implementation Notes