tools/power/cpupower/utils/cpupower-info.c

Source file repositories/reference/linux-study-clean/tools/power/cpupower/utils/cpupower-info.c

File Facts

System
Linux kernel
Corpus path
tools/power/cpupower/utils/cpupower-info.c
Extension
.c
Size
2315 bytes
Lines
113
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 (ret) {
		case 'b':
			if (params.perf_bias)
				print_wrong_arg_exit();
			params.perf_bias = 1;
			break;
		default:
			print_wrong_arg_exit();
		}
	}

	if (!params.params)
		params.params = 0x7;

	/* Default is: show output of base_cpu only */
	if (bitmask_isallclear(cpus_chosen))
		bitmask_setbit(cpus_chosen, base_cpu);

	/* Add more per cpu options here */
	if (!params.perf_bias)
		return ret;

	if (params.perf_bias) {
		if (!run_as_root) {
			params.perf_bias = 0;
			printf(_("Intel's performance bias setting needs root privileges\n"));
		} else if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS)) {
			printf(_("System does not support Intel's performance"
				 " bias setting\n"));
			params.perf_bias = 0;
		}
	}

	/* loop over CPUs */
	for (cpu = bitmask_first(cpus_chosen);
	     cpu <= bitmask_last(cpus_chosen); cpu++) {

		if (!bitmask_isbitset(cpus_chosen, cpu))
			continue;

		printf(_("analyzing CPU %d:\n"), cpu);

		if (sysfs_is_cpu_online(cpu) != 1){
			printf(_(" *is offline\n"));
			continue;
		}

		if (params.perf_bias) {
			ret = cpupower_intel_get_perf_bias(cpu);
			if (ret < 0) {
				fprintf(stderr,
			_("Could not read perf-bias value[%d]\n"), ret);
				exit(EXIT_FAILURE);
			} else
				printf(_("perf-bias: %d\n"), ret);
		}
	}
	return 0;
}

Annotation

Implementation Notes