[dpdk-dev] [v3 1/3] examples/vm_power_manager: Make branch ratio threshold per core

[Rory Sexton]

This modification allows for the branch ratio threshold to be set
per core rather than system wide. This gives greater flexibility to
the branch ration monitoring allowing it to manage different
workloads with different characteristics on the same system.

Signed-off-by: Rory Sexton <rory.sexton at intel.com>
Reviewed-by: David Hunt <david.hunt at intel.com>
---
 examples/vm_power_manager/main.c            | 41 +++++++++++---------
 examples/vm_power_manager/oob_monitor_x86.c |  2 +-
 examples/vm_power_manager/parse.c           | 42 ++++++++++++++++++++-
 examples/vm_power_manager/parse.h           |  3 ++
 examples/vm_power_manager/power_manager.c   |  2 +-
 examples/vm_power_manager/power_manager.h   |  2 +-
 6 files changed, 69 insertions(+), 23 deletions(-)

diff --git a/examples/vm_power_manager/main.c b/examples/vm_power_manager/main.c
index 273bfec29..a42a7e4e1 100644
--- a/examples/vm_power_manager/main.c
+++ b/examples/vm_power_manager/main.c
@@ -165,15 +165,14 @@ parse_args(int argc, char **argv)
 	static struct option lgopts[] = {
 		{ "mac-updating", no_argument, 0, 1},
 		{ "no-mac-updating", no_argument, 0, 0},
-		{ "core-list", optional_argument, 0, 'l'},
+		{ "core-branch-ratio", optional_argument, 0, 'b'},
 		{ "port-list", optional_argument, 0, 'p'},
-		{ "branch-ratio", optional_argument, 0, 'b'},
 		{NULL, 0, 0, 0}
 	};
 	argvopt = argv;
 	ci = get_core_info();
 
-	while ((opt = getopt_long(argc, argvopt, "l:p:q:T:b:",
+	while ((opt = getopt_long(argc, argvopt, "p:q:T:b:",
 				  lgopts, &option_index)) != EOF) {
 
 		switch (opt) {
@@ -185,7 +184,8 @@ parse_args(int argc, char **argv)
 				return -1;
 			}
 			break;
-		case 'l':
+		case 'b':
+			branch_ratio = BRANCH_RATIO_THRESHOLD;
 			oob_enable = malloc(ci->core_count * sizeof(uint16_t));
 			if (oob_enable == NULL) {
 				printf("Error - Unable to allocate memory\n");
@@ -193,32 +193,37 @@ parse_args(int argc, char **argv)
 			}
 			cnt = parse_set(optarg, oob_enable, ci->core_count);
 			if (cnt < 0) {
-				printf("Invalid core-list - [%s]\n",
+				printf("Invalid core-list section in "
+				       "core-branch-ratio matrix - [%s]\n",
+						optarg);
+				free(oob_enable);
+				break;
+			}
+			cnt = parse_branch_ratio(optarg, &branch_ratio);
+			if (cnt < 0) {
+				printf("Invalid branch-ratio section in "
+				       "core-branch-ratio matrix - [%s]\n",
 						optarg);
 				free(oob_enable);
 				break;
 			}
+			if (branch_ratio <= 0.0) {
+				printf("invalid branch ratio specified\n");
+				return -1;
+			}
 			for (i = 0; i < ci->core_count; i++) {
 				if (oob_enable[i]) {
-					printf("***Using core %d\n", i);
+					printf("***Using core %d "
+					       "with branch ratio %f\n",
+					       i, branch_ratio);
 					ci->cd[i].oob_enabled = 1;
 					ci->cd[i].global_enabled_cpus = 1;
+					ci->cd[i].branch_ratio_threshold =
+								branch_ratio;
 				}
 			}
 			free(oob_enable);
 			break;
-		case 'b':
-			branch_ratio = 0.0;
-			if (strlen(optarg))
-				branch_ratio = atof(optarg);
-			if (branch_ratio <= 0.0) {
-				printf("invalid branch ratio specified\n");
-				return -1;
-			}
-			ci->branch_ratio_threshold = branch_ratio;
-			printf("***Setting branch ratio to %f\n",
-					branch_ratio);
-			break;
 		/* long options */
 		case 0:
 			break;
diff --git a/examples/vm_power_manager/oob_monitor_x86.c b/examples/vm_power_manager/oob_monitor_x86.c
index aecfcb2eb..3c514475f 100644
--- a/examples/vm_power_manager/oob_monitor_x86.c
+++ b/examples/vm_power_manager/oob_monitor_x86.c
@@ -109,7 +109,7 @@ apply_policy(int core)
 	 * down. Each core_details struct has it's own array.
 	 */
 	freq_window_idx = ci->cd[core].freq_window_idx;
-	if (ratio > ci->branch_ratio_threshold)
+	if (ratio > ci->cd[core].branch_ratio_threshold)
 		ci->cd[core].freq_directions[freq_window_idx] = 1;
 	else
 		ci->cd[core].freq_directions[freq_window_idx] = 0;
diff --git a/examples/vm_power_manager/parse.c b/examples/vm_power_manager/parse.c
index 8231533b6..8a8dcf05f 100644
--- a/examples/vm_power_manager/parse.c
+++ b/examples/vm_power_manager/parse.c
@@ -60,7 +60,7 @@ parse_set(const char *input, uint16_t set[], unsigned int num)
 				min = idx;
 			else /* avoid continuous '-' */
 				return -1;
-		} else if ((*end == ',') || (*end == '\0')) {
+		} else if ((*end == ',') || (*end == ':') || (*end == '\0')) {
 			max = idx;
 
 			if (min == num)
@@ -75,7 +75,45 @@ parse_set(const char *input, uint16_t set[], unsigned int num)
 			return -1;
 
 		str = end + 1;
-	} while (*end != '\0');
+	} while ((*end != '\0') && (*end != ':'));
+
+	return str - input;
+}
+
+int
+parse_branch_ratio(const char *input, float *branch_ratio)
+{
+	const char *str = input;
+	char *end = NULL;
+
+	while (isblank(*str))
+		str++;
+
+	if (*str == '\0')
+		return -1;
+
+	/* Go straight to the ':' separator if present */
+	while ((*str != '\0') && (*str != ':'))
+		str++;
+
+	/* Branch ratio not specified in args so leave it at default setting */
+	if (*str == '\0')
+		return 0;
+
+	/* Confirm ':' separator present */
+	if (*str != ':')
+		return -1;
+
+	str++;
+	errno = 0;
+	*branch_ratio = strtof(str, &end);
+	if (errno || end == NULL)
+		return -1;
+
+	if (*end != '\0')
+		return -1;
+
+	str = end + 1;
 
 	return str - input;
 }
diff --git a/examples/vm_power_manager/parse.h b/examples/vm_power_manager/parse.h
index a5971e9a2..892dee449 100644
--- a/examples/vm_power_manager/parse.h
+++ b/examples/vm_power_manager/parse.h
@@ -12,6 +12,9 @@ extern "C" {
 int
 parse_set(const char *, uint16_t [], unsigned int);
 
+int
+parse_branch_ratio(const char *input, float *branch_ratio);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/examples/vm_power_manager/power_manager.c b/examples/vm_power_manager/power_manager.c
index cd51d4741..c5cf6bffa 100644
--- a/examples/vm_power_manager/power_manager.c
+++ b/examples/vm_power_manager/power_manager.c
@@ -59,7 +59,6 @@ core_info_init(void)
 	ci = get_core_info();
 
 	ci->core_count = get_nprocs_conf();
-	ci->branch_ratio_threshold = BRANCH_RATIO_THRESHOLD;
 	ci->cd = malloc(ci->core_count * sizeof(struct core_details));
 	memset(ci->cd, 0, ci->core_count * sizeof(struct core_details));
 	if (!ci->cd) {
@@ -68,6 +67,7 @@ core_info_init(void)
 	}
 	for (i = 0; i < ci->core_count; i++) {
 		ci->cd[i].global_enabled_cpus = 1;
+		ci->cd[i].branch_ratio_threshold = BRANCH_RATIO_THRESHOLD;
 	}
 	printf("%d cores in system\n", ci->core_count);
 	return 0;
diff --git a/examples/vm_power_manager/power_manager.h b/examples/vm_power_manager/power_manager.h
index e324766b6..d35f8cbe0 100644
--- a/examples/vm_power_manager/power_manager.h
+++ b/examples/vm_power_manager/power_manager.h
@@ -26,12 +26,12 @@ struct core_details {
 	uint16_t freq_directions[FREQ_WINDOW_SIZE];
 	uint16_t freq_window_idx;
 	uint16_t freq_state;
+	float branch_ratio_threshold;
 };
 
 struct core_info {
 	uint16_t core_count;
 	struct core_details *cd;
-	float branch_ratio_threshold;
 };
 
 #define BRANCH_RATIO_THRESHOLD 0.1
-- 
2.25.1