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-rw-r--r--tools/testing/selftests/resctrl/mba_test.c4
-rw-r--r--tools/testing/selftests/resctrl/mbm_test.c4
-rw-r--r--tools/testing/selftests/resctrl/resctrl.h8
-rw-r--r--tools/testing/selftests/resctrl/resctrl_val.c234
-rw-r--r--tools/testing/selftests/resctrl/resctrlfs.c17
5 files changed, 85 insertions, 182 deletions
diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c
index da40a8ed4413..be0ead73e55d 100644
--- a/tools/testing/selftests/resctrl/mba_test.c
+++ b/tools/testing/selftests/resctrl/mba_test.c
@@ -21,7 +21,7 @@ static int mba_init(const struct resctrl_val_param *param, int domain_id)
{
int ret;
- ret = initialize_mem_bw_imc();
+ ret = initialize_read_mem_bw_imc();
if (ret)
return ret;
@@ -68,7 +68,7 @@ static int mba_setup(const struct resctrl_test *test,
static int mba_measure(const struct user_params *uparams,
struct resctrl_val_param *param, pid_t bm_pid)
{
- return measure_mem_bw(uparams, param, bm_pid, "reads");
+ return measure_read_mem_bw(uparams, param, bm_pid);
}
static bool show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c
index cf08ba5e314e..defa94293915 100644
--- a/tools/testing/selftests/resctrl/mbm_test.c
+++ b/tools/testing/selftests/resctrl/mbm_test.c
@@ -91,7 +91,7 @@ static int mbm_init(const struct resctrl_val_param *param, int domain_id)
{
int ret;
- ret = initialize_mem_bw_imc();
+ ret = initialize_read_mem_bw_imc();
if (ret)
return ret;
@@ -122,7 +122,7 @@ static int mbm_setup(const struct resctrl_test *test,
static int mbm_measure(const struct user_params *uparams,
struct resctrl_val_param *param, pid_t bm_pid)
{
- return measure_mem_bw(uparams, param, bm_pid, "reads");
+ return measure_read_mem_bw(uparams, param, bm_pid);
}
static void mbm_test_cleanup(void)
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index ba1ce1b35699..82801245e4c1 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -126,7 +126,6 @@ int filter_dmesg(void);
int get_domain_id(const char *resource, int cpu_no, int *domain_id);
int mount_resctrlfs(void);
int umount_resctrlfs(void);
-const char *get_bw_report_type(const char *bw_report);
bool resctrl_resource_exists(const char *resource);
bool resctrl_mon_feature_exists(const char *resource, const char *feature);
bool resource_info_file_exists(const char *resource, const char *file);
@@ -143,10 +142,9 @@ unsigned char *alloc_buffer(size_t buf_size, int memflush);
void mem_flush(unsigned char *buf, size_t buf_size);
void fill_cache_read(unsigned char *buf, size_t buf_size, bool once);
int run_fill_buf(size_t buf_size, int memflush);
-int initialize_mem_bw_imc(void);
-int measure_mem_bw(const struct user_params *uparams,
- struct resctrl_val_param *param, pid_t bm_pid,
- const char *bw_report);
+int initialize_read_mem_bw_imc(void);
+int measure_read_mem_bw(const struct user_params *uparams,
+ struct resctrl_val_param *param, pid_t bm_pid);
void initialize_mem_bw_resctrl(const struct resctrl_val_param *param,
int domain_id);
int resctrl_val(const struct resctrl_test *test,
diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
index 113ca18d67c1..c4ebf70a46ef 100644
--- a/tools/testing/selftests/resctrl/resctrl_val.c
+++ b/tools/testing/selftests/resctrl/resctrl_val.c
@@ -12,13 +12,10 @@
#define UNCORE_IMC "uncore_imc"
#define READ_FILE_NAME "events/cas_count_read"
-#define WRITE_FILE_NAME "events/cas_count_write"
#define DYN_PMU_PATH "/sys/bus/event_source/devices"
#define SCALE 0.00006103515625
#define MAX_IMCS 20
#define MAX_TOKENS 5
-#define READ 0
-#define WRITE 1
#define CON_MBM_LOCAL_BYTES_PATH \
"%s/%s/mon_data/mon_L3_%02d/mbm_local_bytes"
@@ -41,44 +38,43 @@ struct imc_counter_config {
static char mbm_total_path[1024];
static int imcs;
-static struct imc_counter_config imc_counters_config[MAX_IMCS][2];
+static struct imc_counter_config imc_counters_config[MAX_IMCS];
static const struct resctrl_test *current_test;
-static void membw_initialize_perf_event_attr(int i, int j)
+static void read_mem_bw_initialize_perf_event_attr(int i)
{
- memset(&imc_counters_config[i][j].pe, 0,
+ memset(&imc_counters_config[i].pe, 0,
sizeof(struct perf_event_attr));
- imc_counters_config[i][j].pe.type = imc_counters_config[i][j].type;
- imc_counters_config[i][j].pe.size = sizeof(struct perf_event_attr);
- imc_counters_config[i][j].pe.disabled = 1;
- imc_counters_config[i][j].pe.inherit = 1;
- imc_counters_config[i][j].pe.exclude_guest = 0;
- imc_counters_config[i][j].pe.config =
- imc_counters_config[i][j].umask << 8 |
- imc_counters_config[i][j].event;
- imc_counters_config[i][j].pe.sample_type = PERF_SAMPLE_IDENTIFIER;
- imc_counters_config[i][j].pe.read_format =
+ imc_counters_config[i].pe.type = imc_counters_config[i].type;
+ imc_counters_config[i].pe.size = sizeof(struct perf_event_attr);
+ imc_counters_config[i].pe.disabled = 1;
+ imc_counters_config[i].pe.inherit = 1;
+ imc_counters_config[i].pe.exclude_guest = 0;
+ imc_counters_config[i].pe.config =
+ imc_counters_config[i].umask << 8 |
+ imc_counters_config[i].event;
+ imc_counters_config[i].pe.sample_type = PERF_SAMPLE_IDENTIFIER;
+ imc_counters_config[i].pe.read_format =
PERF_FORMAT_TOTAL_TIME_ENABLED | PERF_FORMAT_TOTAL_TIME_RUNNING;
}
-static void membw_ioctl_perf_event_ioc_reset_enable(int i, int j)
+static void read_mem_bw_ioctl_perf_event_ioc_reset_enable(int i)
{
- ioctl(imc_counters_config[i][j].fd, PERF_EVENT_IOC_RESET, 0);
- ioctl(imc_counters_config[i][j].fd, PERF_EVENT_IOC_ENABLE, 0);
+ ioctl(imc_counters_config[i].fd, PERF_EVENT_IOC_RESET, 0);
+ ioctl(imc_counters_config[i].fd, PERF_EVENT_IOC_ENABLE, 0);
}
-static void membw_ioctl_perf_event_ioc_disable(int i, int j)
+static void read_mem_bw_ioctl_perf_event_ioc_disable(int i)
{
- ioctl(imc_counters_config[i][j].fd, PERF_EVENT_IOC_DISABLE, 0);
+ ioctl(imc_counters_config[i].fd, PERF_EVENT_IOC_DISABLE, 0);
}
/*
- * get_event_and_umask: Parse config into event and umask
+ * get_read_event_and_umask: Parse config into event and umask
* @cas_count_cfg: Config
* @count: iMC number
- * @op: Operation (read/write)
*/
-static void get_event_and_umask(char *cas_count_cfg, int count, bool op)
+static void get_read_event_and_umask(char *cas_count_cfg, int count)
{
char *token[MAX_TOKENS];
int i = 0;
@@ -91,34 +87,22 @@ static void get_event_and_umask(char *cas_count_cfg, int count, bool op)
for (i = 0; i < MAX_TOKENS - 1; i++) {
if (!token[i])
break;
- if (strcmp(token[i], "event") == 0) {
- if (op == READ)
- imc_counters_config[count][READ].event =
- strtol(token[i + 1], NULL, 16);
- else
- imc_counters_config[count][WRITE].event =
- strtol(token[i + 1], NULL, 16);
- }
- if (strcmp(token[i], "umask") == 0) {
- if (op == READ)
- imc_counters_config[count][READ].umask =
- strtol(token[i + 1], NULL, 16);
- else
- imc_counters_config[count][WRITE].umask =
- strtol(token[i + 1], NULL, 16);
- }
+ if (strcmp(token[i], "event") == 0)
+ imc_counters_config[count].event = strtol(token[i + 1], NULL, 16);
+ if (strcmp(token[i], "umask") == 0)
+ imc_counters_config[count].umask = strtol(token[i + 1], NULL, 16);
}
}
-static int open_perf_event(int i, int cpu_no, int j)
+static int open_perf_read_event(int i, int cpu_no)
{
- imc_counters_config[i][j].fd =
- perf_event_open(&imc_counters_config[i][j].pe, -1, cpu_no, -1,
+ imc_counters_config[i].fd =
+ perf_event_open(&imc_counters_config[i].pe, -1, cpu_no, -1,
PERF_FLAG_FD_CLOEXEC);
- if (imc_counters_config[i][j].fd == -1) {
+ if (imc_counters_config[i].fd == -1) {
fprintf(stderr, "Error opening leader %llx\n",
- imc_counters_config[i][j].pe.config);
+ imc_counters_config[i].pe.config);
return -1;
}
@@ -126,7 +110,7 @@ static int open_perf_event(int i, int cpu_no, int j)
return 0;
}
-/* Get type and config (read and write) of an iMC counter */
+/* Get type and config of an iMC counter's read event. */
static int read_from_imc_dir(char *imc_dir, int count)
{
char cas_count_cfg[1024], imc_counter_cfg[1024], imc_counter_type[1024];
@@ -140,7 +124,7 @@ static int read_from_imc_dir(char *imc_dir, int count)
return -1;
}
- if (fscanf(fp, "%u", &imc_counters_config[count][READ].type) <= 0) {
+ if (fscanf(fp, "%u", &imc_counters_config[count].type) <= 0) {
ksft_perror("Could not get iMC type");
fclose(fp);
@@ -148,9 +132,6 @@ static int read_from_imc_dir(char *imc_dir, int count)
}
fclose(fp);
- imc_counters_config[count][WRITE].type =
- imc_counters_config[count][READ].type;
-
/* Get read config */
sprintf(imc_counter_cfg, "%s%s", imc_dir, READ_FILE_NAME);
fp = fopen(imc_counter_cfg, "r");
@@ -167,34 +148,19 @@ static int read_from_imc_dir(char *imc_dir, int count)
}
fclose(fp);
- get_event_and_umask(cas_count_cfg, count, READ);
-
- /* Get write config */
- sprintf(imc_counter_cfg, "%s%s", imc_dir, WRITE_FILE_NAME);
- fp = fopen(imc_counter_cfg, "r");
- if (!fp) {
- ksft_perror("Failed to open iMC config file");
-
- return -1;
- }
- if (fscanf(fp, "%1023s", cas_count_cfg) <= 0) {
- ksft_perror("Could not get iMC cas count write");
- fclose(fp);
-
- return -1;
- }
- fclose(fp);
-
- get_event_and_umask(cas_count_cfg, count, WRITE);
+ get_read_event_and_umask(cas_count_cfg, count);
return 0;
}
/*
* A system can have 'n' number of iMC (Integrated Memory Controller)
- * counters, get that 'n'. For each iMC counter get it's type and config.
- * Also, each counter has two configs, one for read and the other for write.
- * A config again has two parts, event and umask.
+ * counters, get that 'n'. Discover the properties of the available
+ * counters in support of needed performance measurement via perf.
+ * For each iMC counter get it's type and config. Also obtain each
+ * counter's event and umask for the memory read events that will be
+ * measured.
+ *
* Enumerate all these details into an array of structures.
*
* Return: >= 0 on success. < 0 on failure.
@@ -255,55 +221,46 @@ static int num_of_imcs(void)
return count;
}
-int initialize_mem_bw_imc(void)
+int initialize_read_mem_bw_imc(void)
{
- int imc, j;
+ int imc;
imcs = num_of_imcs();
if (imcs <= 0)
return imcs;
/* Initialize perf_event_attr structures for all iMC's */
- for (imc = 0; imc < imcs; imc++) {
- for (j = 0; j < 2; j++)
- membw_initialize_perf_event_attr(imc, j);
- }
+ for (imc = 0; imc < imcs; imc++)
+ read_mem_bw_initialize_perf_event_attr(imc);
return 0;
}
-static void perf_close_imc_mem_bw(void)
+static void perf_close_imc_read_mem_bw(void)
{
int mc;
for (mc = 0; mc < imcs; mc++) {
- if (imc_counters_config[mc][READ].fd != -1)
- close(imc_counters_config[mc][READ].fd);
- if (imc_counters_config[mc][WRITE].fd != -1)
- close(imc_counters_config[mc][WRITE].fd);
+ if (imc_counters_config[mc].fd != -1)
+ close(imc_counters_config[mc].fd);
}
}
/*
- * perf_open_imc_mem_bw - Open perf fds for IMCs
+ * perf_open_imc_read_mem_bw - Open perf fds for IMCs
* @cpu_no: CPU number that the benchmark PID is bound to
*
* Return: = 0 on success. < 0 on failure.
*/
-static int perf_open_imc_mem_bw(int cpu_no)
+static int perf_open_imc_read_mem_bw(int cpu_no)
{
int imc, ret;
- for (imc = 0; imc < imcs; imc++) {
- imc_counters_config[imc][READ].fd = -1;
- imc_counters_config[imc][WRITE].fd = -1;
- }
+ for (imc = 0; imc < imcs; imc++)
+ imc_counters_config[imc].fd = -1;
for (imc = 0; imc < imcs; imc++) {
- ret = open_perf_event(imc, cpu_no, READ);
- if (ret)
- goto close_fds;
- ret = open_perf_event(imc, cpu_no, WRITE);
+ ret = open_perf_read_event(imc, cpu_no);
if (ret)
goto close_fds;
}
@@ -311,60 +268,52 @@ static int perf_open_imc_mem_bw(int cpu_no)
return 0;
close_fds:
- perf_close_imc_mem_bw();
+ perf_close_imc_read_mem_bw();
return -1;
}
/*
- * do_mem_bw_test - Perform memory bandwidth test
+ * do_imc_read_mem_bw_test - Perform memory bandwidth test
*
* Runs memory bandwidth test over one second period. Also, handles starting
* and stopping of the IMC perf counters around the test.
*/
-static void do_imc_mem_bw_test(void)
+static void do_imc_read_mem_bw_test(void)
{
int imc;
- for (imc = 0; imc < imcs; imc++) {
- membw_ioctl_perf_event_ioc_reset_enable(imc, READ);
- membw_ioctl_perf_event_ioc_reset_enable(imc, WRITE);
- }
+ for (imc = 0; imc < imcs; imc++)
+ read_mem_bw_ioctl_perf_event_ioc_reset_enable(imc);
sleep(1);
- /* Stop counters after a second to get results (both read and write) */
- for (imc = 0; imc < imcs; imc++) {
- membw_ioctl_perf_event_ioc_disable(imc, READ);
- membw_ioctl_perf_event_ioc_disable(imc, WRITE);
- }
+ /* Stop counters after a second to get results. */
+ for (imc = 0; imc < imcs; imc++)
+ read_mem_bw_ioctl_perf_event_ioc_disable(imc);
}
/*
- * get_mem_bw_imc - Memory bandwidth as reported by iMC counters
- * @bw_report: Bandwidth report type (reads, writes)
+ * get_read_mem_bw_imc - Memory read bandwidth as reported by iMC counters
*
- * Memory bandwidth utilized by a process on a socket can be calculated
- * using iMC counters. Perf events are used to read these counters.
+ * Memory read bandwidth utilized by a process on a socket can be calculated
+ * using iMC counters' read events. Perf events are used to read these
+ * counters.
*
* Return: = 0 on success. < 0 on failure.
*/
-static int get_mem_bw_imc(const char *bw_report, float *bw_imc)
+static int get_read_mem_bw_imc(float *bw_imc)
{
- float reads, writes, of_mul_read, of_mul_write;
+ float reads = 0, of_mul_read = 1;
int imc;
- /* Start all iMC counters to log values (both read and write) */
- reads = 0, writes = 0, of_mul_read = 1, of_mul_write = 1;
-
/*
- * Get results which are stored in struct type imc_counter_config
+ * Log read event values from all iMC counters into
+ * struct imc_counter_config.
* Take overflow into consideration before calculating total bandwidth.
*/
for (imc = 0; imc < imcs; imc++) {
struct imc_counter_config *r =
- &imc_counters_config[imc][READ];
- struct imc_counter_config *w =
- &imc_counters_config[imc][WRITE];
+ &imc_counters_config[imc];
if (read(r->fd, &r->return_value,
sizeof(struct membw_read_format)) == -1) {
@@ -372,12 +321,6 @@ static int get_mem_bw_imc(const char *bw_report, float *bw_imc)
return -1;
}
- if (read(w->fd, &w->return_value,
- sizeof(struct membw_read_format)) == -1) {
- ksft_perror("Couldn't get write bandwidth through iMC");
- return -1;
- }
-
__u64 r_time_enabled = r->return_value.time_enabled;
__u64 r_time_running = r->return_value.time_running;
@@ -385,27 +328,10 @@ static int get_mem_bw_imc(const char *bw_report, float *bw_imc)
of_mul_read = (float)r_time_enabled /
(float)r_time_running;
- __u64 w_time_enabled = w->return_value.time_enabled;
- __u64 w_time_running = w->return_value.time_running;
-
- if (w_time_enabled != w_time_running)
- of_mul_write = (float)w_time_enabled /
- (float)w_time_running;
reads += r->return_value.value * of_mul_read * SCALE;
- writes += w->return_value.value * of_mul_write * SCALE;
- }
-
- if (strcmp(bw_report, "reads") == 0) {
- *bw_imc = reads;
- return 0;
- }
-
- if (strcmp(bw_report, "writes") == 0) {
- *bw_imc = writes;
- return 0;
}
- *bw_imc = reads + writes;
+ *bw_imc = reads;
return 0;
}
@@ -551,35 +477,31 @@ static int print_results_bw(char *filename, pid_t bm_pid, float bw_imc,
}
/*
- * measure_mem_bw - Measures memory bandwidth numbers while benchmark runs
+ * measure_read_mem_bw - Measures read memory bandwidth numbers while benchmark runs
* @uparams: User supplied parameters
* @param: Parameters passed to resctrl_val()
* @bm_pid: PID that runs the benchmark
- * @bw_report: Bandwidth report type (reads, writes)
*
* Measure memory bandwidth from resctrl and from another source which is
* perf imc value or could be something else if perf imc event is not
* available. Compare the two values to validate resctrl value. It takes
* 1 sec to measure the data.
+ * resctrl does not distinguish between read and write operations so
+ * its data includes all memory operations.
*/
-int measure_mem_bw(const struct user_params *uparams,
- struct resctrl_val_param *param, pid_t bm_pid,
- const char *bw_report)
+int measure_read_mem_bw(const struct user_params *uparams,
+ struct resctrl_val_param *param, pid_t bm_pid)
{
unsigned long bw_resc, bw_resc_start, bw_resc_end;
FILE *mem_bw_fp;
float bw_imc;
int ret;
- bw_report = get_bw_report_type(bw_report);
- if (!bw_report)
- return -1;
-
mem_bw_fp = open_mem_bw_resctrl(mbm_total_path);
if (!mem_bw_fp)
return -1;
- ret = perf_open_imc_mem_bw(uparams->cpu);
+ ret = perf_open_imc_read_mem_bw(uparams->cpu);
if (ret < 0)
goto close_fp;
@@ -589,17 +511,17 @@ int measure_mem_bw(const struct user_params *uparams,
rewind(mem_bw_fp);
- do_imc_mem_bw_test();
+ do_imc_read_mem_bw_test();
ret = get_mem_bw_resctrl(mem_bw_fp, &bw_resc_end);
if (ret < 0)
goto close_imc;
- ret = get_mem_bw_imc(bw_report, &bw_imc);
+ ret = get_read_mem_bw_imc(&bw_imc);
if (ret < 0)
goto close_imc;
- perf_close_imc_mem_bw();
+ perf_close_imc_read_mem_bw();
fclose(mem_bw_fp);
bw_resc = (bw_resc_end - bw_resc_start) / MB;
@@ -607,7 +529,7 @@ int measure_mem_bw(const struct user_params *uparams,
return print_results_bw(param->filename, bm_pid, bw_imc, bw_resc);
close_imc:
- perf_close_imc_mem_bw();
+ perf_close_imc_read_mem_bw();
close_fp:
fclose(mem_bw_fp);
return ret;
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index a53cd1cb6e0c..d38d6dd90be4 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -831,23 +831,6 @@ int filter_dmesg(void)
return 0;
}
-const char *get_bw_report_type(const char *bw_report)
-{
- if (strcmp(bw_report, "reads") == 0)
- return bw_report;
- if (strcmp(bw_report, "writes") == 0)
- return bw_report;
- if (strcmp(bw_report, "nt-writes") == 0) {
- return "writes";
- }
- if (strcmp(bw_report, "total") == 0)
- return bw_report;
-
- fprintf(stderr, "Requested iMC bandwidth report type unavailable\n");
-
- return NULL;
-}
-
int perf_event_open(struct perf_event_attr *hw_event, pid_t pid, int cpu,
int group_fd, unsigned long flags)
{
generated by cgit v1.2.3 (git 2.0.4) at 2025-12-26 15:51:43 +0000