tools/testing/selftests/resctrl/mbm_test.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/resctrl/mbm_test.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/resctrl/mbm_test.c
Extension
.c
Size
4410 bytes
Lines
185
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

while (token) {
			token_array[i++] = token;
			token = strtok(NULL, ":\t");
		}

		bw_resc[runs] = strtoul(token_array[5], NULL, 0);
		bw_imc[runs] = strtoul(token_array[3], NULL, 0);
		runs++;
	}

	ret = show_bw_info(bw_imc, bw_resc, span);

	fclose(fp);

	return ret;
}

static int mbm_init(const struct resctrl_test *test,
		    const struct user_params *uparams,
		    const struct resctrl_val_param *param, int domain_id)
{
	int ret;

	ret = initialize_read_mem_bw_imc();
	if (ret)
		return ret;

	initialize_mem_bw_resctrl(param, domain_id);

	return 0;
}

static int mbm_setup(const struct resctrl_test *test,
		     const struct user_params *uparams,
		     struct resctrl_val_param *p)
{
	int ret = 0;

	/* Run NUM_OF_RUNS times */
	if (p->num_of_runs >= NUM_OF_RUNS)
		return END_OF_TESTS;

	/* Set up shemata with 100% allocation on the first run. */
	if (p->num_of_runs == 0 && resctrl_resource_exists("MB"))
		ret = write_schemata(p->ctrlgrp, "100", uparams->cpu, test->resource);

	p->num_of_runs++;

	return ret;
}

static int mbm_measure(const struct user_params *uparams,
		       struct resctrl_val_param *param, pid_t bm_pid)
{
	return measure_read_mem_bw(uparams, param, bm_pid);
}

static void mbm_test_cleanup(void)
{
	remove(RESULT_FILE_NAME);
}

static int mbm_run_test(const struct resctrl_test *test, const struct user_params *uparams)
{
	struct resctrl_val_param param = {
		.ctrlgrp	= "c1",
		.filename	= RESULT_FILE_NAME,
		.init		= mbm_init,
		.setup		= mbm_setup,
		.measure	= mbm_measure,
	};
	struct fill_buf_param fill_buf = {};
	int ret;

	remove(RESULT_FILE_NAME);

	if (uparams->fill_buf) {
		fill_buf.buf_size = uparams->fill_buf->buf_size;
		fill_buf.memflush = uparams->fill_buf->memflush;
		param.fill_buf = &fill_buf;
	} else if (!uparams->benchmark_cmd[0]) {
		ssize_t buf_size;

		buf_size = get_fill_buf_size(uparams->cpu, "L3");
		if (buf_size < 0)
			return buf_size;
		fill_buf.buf_size = buf_size;
		fill_buf.memflush = true;
		param.fill_buf = &fill_buf;
	}

Annotation

Implementation Notes