--- /dev/null
+/**
+ * collectd - src/utils_config_cores.c
+ *
+ * Copyright(c) 2017 Intel Corporation. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Authors:
+ * Kamil Wiatrowski <kamilx.wiatrowski@intel.com>
+ **/
+
+#include "collectd.h"
+
+#include "common.h"
+
+#include "utils_config_cores.h"
+
+#define UTIL_NAME "utils_config_cores"
+
+#define MAX_SOCKETS 8
+#define MAX_SOCKET_CORES 64
+#define MAX_CORES (MAX_SOCKET_CORES * MAX_SOCKETS)
+
+static inline _Bool is_in_list(unsigned val, const unsigned *list, size_t len) {
+ for (size_t i = 0; i < len; i++)
+ if (list[i] == val)
+ return 1;
+ return 0;
+}
+
+static int str_to_uint(const char *s, unsigned *n) {
+ if (s == NULL || n == NULL)
+ return -EINVAL;
+ char *endptr = NULL;
+
+ *n = (unsigned) strtoul(s, &endptr, 0);
+ if (*s == '\0' || *endptr != '\0') {
+ ERROR(UTIL_NAME ": Failed to parse '%s' into unsigned number", s);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/*
+ * NAME
+ * str_list_to_nums
+ *
+ * DESCRIPTION
+ * Converts string of characters representing list of numbers into array of
+ * numbers. Allowed formats are:
+ * 0,1,2,3
+ * 0-10,20-18
+ * 1,3,5-8,10,0x10-12
+ *
+ * Numbers can be in decimal or hexadecimal format.
+ *
+ * PARAMETERS
+ * `s' String representing list of unsigned numbers.
+ * `nums' Array to put converted numeric values into.
+ * `nums_len' Maximum number of elements that nums can accommodate.
+ *
+ * RETURN VALUE
+ * Number of elements placed into nums.
+ */
+static size_t str_list_to_nums(char *s, unsigned *nums, size_t nums_len) {
+ char *saveptr;
+ char *token;
+ size_t idx = 0;
+
+ while((token = strtok_r(s, ",", &saveptr))) {
+ char *pos;
+ unsigned start, end = 0;
+ s = NULL;
+
+ while (isspace(*token))
+ token++;
+ if (*token == '\0')
+ continue;
+
+ pos = strchr(token, '-');
+ if (pos) {
+ *pos = '\0';
+ }
+
+ if (str_to_uint(token, &start))
+ return 0;
+
+ if (pos) {
+ if (str_to_uint(pos + 1, &end))
+ return 0;
+ } else {
+ end = start;
+ }
+
+ if (start > end) {
+ unsigned swap = start;
+ start = end;
+ end = swap;
+ }
+
+ for (unsigned i = start; i <= end; i++) {
+ if (is_in_list(i, nums, idx))
+ continue;
+ if (idx >= nums_len) {
+ WARNING(UTIL_NAME ": exceeded the cores number limit: %zu", nums_len);
+ return idx;
+ }
+ nums[idx] = i;
+ idx++;
+ }
+ }
+ return idx;
+}
+
+/*
+ * NAME
+ * check_core_grouping
+ *
+ * DESCRIPTION
+ * Look for [...] brackets in *in string and if found copy the
+ * part between brackets into *out string and set grouped to 0.
+ * Otherwise grouped is set to 1 and input is copied without leading
+ * whitespaces.
+ *
+ * PARAMETERS
+ * `out' Output string to store result.
+ * `in' Input string to be parsed and copied.
+ * `out_size' Maximum number of elements that out can accommodate.
+ * `grouped' Set by function depending if cores should be grouped or not.
+ *
+ * RETURN VALUE
+ * Zero upon success or non-zero if an error occurred.
+ */
+static int check_core_grouping(char *out, const char *in, size_t out_size,
+ _Bool *grouped) {
+ const char *start = in;
+ char *end;
+ while (isspace(*start))
+ ++start;
+ if (start[0] == '[') {
+ *grouped = 0;
+ ++start;
+ end = strchr(start, ']');
+ if (end == NULL) {
+ ERROR(UTIL_NAME ": Missing closing bracket ] in option %s.", in);
+ return -EINVAL;
+ }
+ if ((end - start) >= out_size) {
+ ERROR(UTIL_NAME ": Out buffer is too small.");
+ return -EINVAL;
+ }
+ sstrncpy(out, start, end - start + 1);
+ DEBUG(UTIL_NAME ": Mask for individual (not aggregated) cores: %s", out);
+ } else {
+ *grouped = 1;
+ sstrncpy(out, start, out_size);
+ }
+ return 0;
+}
+
+int config_cores_parse(const oconfig_item_t *ci, core_groups_list_t *cgl) {
+ if (ci == NULL || cgl == NULL)
+ return -EINVAL;
+ if (ci->values_num == 0 || ci->values_num > MAX_CORES)
+ return -EINVAL;
+ core_group_t cgroups[MAX_CORES] = {{0}};
+ size_t cg_idx = 0; /* index for cgroups array */
+ int ret = 0;
+
+ for (int i = 0; i < ci->values_num; i++) {
+ if (ci->values[i].type != OCONFIG_TYPE_STRING) {
+ WARNING(UTIL_NAME ": The %s option requires string arguments.", ci->key);
+ return -EINVAL;
+ }
+ }
+
+ if (ci->values_num == 1 && ci->values[0].value.string &&
+ strlen(ci->values[0].value.string) == 0)
+ return 0;
+
+ for (int i = 0; i < ci->values_num; i++) {
+ size_t n;
+ _Bool grouped = 1;
+ char str[DATA_MAX_NAME_LEN];
+ unsigned cores[MAX_CORES] = {0};
+
+ if (cg_idx >= STATIC_ARRAY_SIZE(cgroups)) {
+ ERROR(UTIL_NAME ": Configuration exceeds maximum number of cores: %zu",
+ STATIC_ARRAY_SIZE(cgroups));
+ ret = -EINVAL;
+ goto parse_error;
+ }
+ if ((ci->values[i].value.string == NULL) ||
+ (strlen(ci->values[i].value.string) == 0)) {
+ ERROR(UTIL_NAME ": Failed to parse parameters for %s option.", ci->key);
+ ret = -EINVAL;
+ goto parse_error;
+ }
+
+ ret = check_core_grouping(str, ci->values[i].value.string, sizeof(str),
+ &grouped);
+ if (ret != 0) {
+ ERROR(UTIL_NAME ": Failed to parse config option [%d] %s.", i,
+ ci->values[i].value.string);
+ goto parse_error;
+ }
+ n = str_list_to_nums(str, cores, STATIC_ARRAY_SIZE(cores));
+ if (n == 0) {
+ ERROR(UTIL_NAME ": Failed to parse config option [%d] %s.", i,
+ ci->values[i].value.string);
+ ret = -EINVAL;
+ goto parse_error;
+ }
+
+ if (grouped) {
+ cgroups[cg_idx].desc = strdup(ci->values[i].value.string);
+ if (cgroups[cg_idx].desc == NULL) {
+ ERROR(UTIL_NAME ": Failed to allocate description.");
+ ret = -ENOMEM;
+ goto parse_error;
+ }
+
+ cgroups[cg_idx].cores = calloc(n, sizeof(*cgroups[cg_idx].cores));
+ if (cgroups[cg_idx].cores == NULL) {
+ ERROR(UTIL_NAME ": Failed to allocate cores for cgroup.");
+ ret = -ENOMEM;
+ goto parse_error;
+ }
+
+ for (size_t j = 0; j < n; j++)
+ cgroups[cg_idx].cores[j] = cores[j];
+
+ cgroups[cg_idx].num_cores = n;
+ cg_idx++;
+ } else {
+ for (size_t j = 0; j < n && cg_idx < STATIC_ARRAY_SIZE(cgroups); j++) {
+ char desc[DATA_MAX_NAME_LEN];
+ snprintf(desc, sizeof(desc), "%u", cores[j]);
+
+ cgroups[cg_idx].desc = strdup(desc);
+ if (cgroups[cg_idx].desc == NULL) {
+ ERROR(UTIL_NAME ": Failed to allocate desc for core %u.", cores[j]);
+ ret = -ENOMEM;
+ goto parse_error;
+ }
+
+ cgroups[cg_idx].cores = calloc(1, sizeof(*(cgroups[cg_idx].cores)));
+ if (cgroups[cg_idx].cores == NULL) {
+ ERROR(UTIL_NAME ": Failed to allocate cgroup for core %u.", cores[j]);
+ ret = -ENOMEM;
+ goto parse_error;
+ }
+ cgroups[cg_idx].num_cores = 1;
+ cgroups[cg_idx].cores[0] = cores[j];
+ cg_idx++;
+ }
+ }
+ }
+
+ cgl->cgroups = calloc(cg_idx, sizeof(*cgl->cgroups));
+ if (cgl->cgroups == NULL) {
+ ERROR(UTIL_NAME ": Failed to allocate core groups.");
+ ret = -ENOMEM;
+ goto parse_error;
+ }
+
+ cgl->num_cgroups = cg_idx;
+ for (size_t i = 0; i < cg_idx; i++)
+ cgl->cgroups[i] = cgroups[i];
+
+ return 0;
+
+parse_error:
+
+ cg_idx = 0;
+ while(cg_idx < STATIC_ARRAY_SIZE(cgroups) && cgroups[cg_idx].desc != NULL) {
+ sfree(cgroups[cg_idx].desc);
+ sfree(cgroups[cg_idx].cores);
+ cg_idx++;
+ }
+ return ret;
+}
+
+int config_cores_default(int num_cores, core_groups_list_t *cgl) {
+ if (cgl == NULL || num_cores < 0 || num_cores > MAX_CORES)
+ return -EINVAL;
+
+ cgl->cgroups = calloc(num_cores, sizeof(*(cgl->cgroups)));
+ if (cgl->cgroups == NULL) {
+ ERROR(UTIL_NAME ": Failed to allocate memory for core groups.");
+ return -ENOMEM;
+ }
+ cgl->num_cgroups = num_cores;
+
+ for (int i = 0; i < num_cores; i++) {
+ char desc[DATA_MAX_NAME_LEN];
+ snprintf(desc, sizeof(desc), "%d", i);
+
+ cgl->cgroups[i].cores = calloc(1, sizeof(*(cgl->cgroups[i].cores)));
+ if (cgl->cgroups[i].cores == NULL) {
+ ERROR(UTIL_NAME ": Failed to allocate default cores for cgroup %d.", i);
+ config_cores_cleanup(cgl);
+ return -ENOMEM;
+ }
+ cgl->cgroups[i].num_cores = 1;
+ cgl->cgroups[i].cores[0] = i;
+
+ cgl->cgroups[i].desc = strdup(desc);
+ if (cgl->cgroups[i].desc == NULL) {
+ ERROR(UTIL_NAME ": Failed to allocate description for cgroup %d.", i);
+ config_cores_cleanup(cgl);
+ return -ENOMEM;
+ }
+ }
+ return 0;
+}
+
+void config_cores_cleanup(core_groups_list_t *cgl) {
+ if (cgl == NULL)
+ return;
+ for (size_t i = 0; i < cgl->num_cgroups; i++) {
+ sfree(cgl->cgroups[i].desc);
+ sfree(cgl->cgroups[i].cores);
+ }
+ sfree(cgl->cgroups);
+ cgl->num_cgroups = 0;
+}
+
+int config_cores_cmp_cgroups(const core_group_t *cg_a,
+ const core_group_t *cg_b) {
+ size_t found = 0;
+
+ assert(cg_a != NULL);
+ assert(cg_b != NULL);
+
+ const size_t sz_a = cg_a->num_cores;
+ const size_t sz_b = cg_b->num_cores;
+ const unsigned *tab_a = cg_a->cores;
+ const unsigned *tab_b = cg_b->cores;
+
+ for (size_t i = 0; i < sz_a; i++)
+ if (is_in_list(tab_a[i], tab_b, sz_b))
+ found++;
+
+ /* if no cores are the same */
+ if (!found)
+ return 0;
+ /* if group contains same cores */
+ if (sz_a == sz_b && sz_b == found)
+ return 1;
+ /* if not all cores are the same */
+ return -1;
+}
+
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