5 /* Return all processors regardless of processor group */
6 unsigned int cpus_online(void)
8 return GetActiveProcessorCount(ALL_PROCESSOR_GROUPS);
11 static void print_mask(os_cpu_mask_t *cpumask)
13 for (int i = 0; i < FIO_CPU_MASK_ROWS; i++)
14 dprint(FD_PROCESS, "cpumask[%d]=%" PRIu64 "\n", i, cpumask->row[i]);
17 /* Return the index of the least significant set CPU in cpumask or -1 if no
19 int first_set_cpu(os_cpu_mask_t *cpumask)
21 int cpus_offset, mask_first_cpu, row;
26 while (mask_first_cpu < 0 && row < FIO_CPU_MASK_ROWS) {
29 row_first_cpu = __builtin_ffsll(cpumask->row[row]) - 1;
30 dprint(FD_PROCESS, "row_first_cpu=%d cpumask->row[%d]=%" PRIu64 "\n",
31 row_first_cpu, row, cpumask->row[row]);
32 if (row_first_cpu > -1) {
33 mask_first_cpu = cpus_offset + row_first_cpu;
34 dprint(FD_PROCESS, "first set cpu in mask is at index %d\n",
37 cpus_offset += FIO_CPU_MASK_STRIDE;
42 return mask_first_cpu;
45 /* Return the index of the most significant set CPU in cpumask or -1 if no
47 static int last_set_cpu(os_cpu_mask_t *cpumask)
49 int cpus_offset, mask_last_cpu, row;
51 cpus_offset = (FIO_CPU_MASK_ROWS - 1) * FIO_CPU_MASK_STRIDE;
52 row = FIO_CPU_MASK_ROWS - 1;
54 while (mask_last_cpu < 0 && row >= 0) {
57 if (cpumask->row[row] == 0)
60 uint64_t tmp = cpumask->row[row];
67 dprint(FD_PROCESS, "row_last_cpu=%d cpumask->row[%d]=%" PRIu64 "\n",
68 row_last_cpu, row, cpumask->row[row]);
69 if (row_last_cpu > -1) {
70 mask_last_cpu = cpus_offset + row_last_cpu;
71 dprint(FD_PROCESS, "last set cpu in mask is at index %d\n",
74 cpus_offset -= FIO_CPU_MASK_STRIDE;
82 static int mask_to_group_mask(os_cpu_mask_t *cpumask, int *processor_group, uint64_t *affinity_mask)
84 WORD online_groups, group, group_size;
86 int cpus_offset, search_cpu, last_cpu, bit_offset, row, end;
87 uint64_t group_cpumask;
89 search_cpu = first_set_cpu(cpumask);
91 log_info("CPU mask doesn't set any CPUs\n");
95 /* Find processor group first set CPU applies to */
96 online_groups = GetActiveProcessorGroupCount();
101 while (!found && group < online_groups) {
102 group_size = GetActiveProcessorCount(group);
103 dprint(FD_PROCESS, "group=%d group_start=%d group_size=%u search_cpu=%d\n",
104 group, cpus_offset, group_size, search_cpu);
105 if (cpus_offset + group_size > search_cpu)
108 cpus_offset += group_size;
114 log_err("CPU mask contains processor beyond last active processor index (%d)\n",
120 /* Check all the CPUs in the mask apply to ONLY that processor group */
121 last_cpu = last_set_cpu(cpumask);
122 if (last_cpu > (cpus_offset + group_size - 1)) {
123 log_info("CPU mask cannot bind CPUs (e.g. %d, %d) that are "
124 "in different processor groups\n", search_cpu,
130 /* Extract the current processor group mask from the cpumask */
131 row = cpus_offset / FIO_CPU_MASK_STRIDE;
132 bit_offset = cpus_offset % FIO_CPU_MASK_STRIDE;
133 group_cpumask = cpumask->row[row] >> bit_offset;
134 end = bit_offset + group_size;
135 if (end > FIO_CPU_MASK_STRIDE && (row + 1 < FIO_CPU_MASK_ROWS)) {
136 /* Some of the next row needs to be part of the mask */
137 int needed, needed_shift, needed_mask_shift;
138 uint64_t needed_mask;
140 needed = end - FIO_CPU_MASK_STRIDE;
141 needed_shift = FIO_CPU_MASK_STRIDE - bit_offset;
142 needed_mask_shift = FIO_CPU_MASK_STRIDE - needed;
143 needed_mask = (uint64_t)-1 >> needed_mask_shift;
145 "bit_offset=%d end=%d needed=%d needed_shift=%d needed_mask=%" PRIu64 "needed_mask_shift=%d\n",
146 bit_offset, end, needed, needed_shift, needed_mask,
148 group_cpumask |= (cpumask->row[row + 1] & needed_mask) << needed_shift;
150 group_cpumask &= (uint64_t)-1 >> (FIO_CPU_MASK_STRIDE - group_size);
152 /* Return group and mask */
153 dprint(FD_PROCESS, "Returning group=%d group_mask=%" PRIu64 "\n",
154 group, group_cpumask);
155 *processor_group = group;
156 *affinity_mask = group_cpumask;
161 int fio_setaffinity(int pid, os_cpu_mask_t cpumask)
163 HANDLE handle = NULL;
165 uint64_t group_mask = 0;
166 GROUP_AFFINITY new_group_affinity;
170 if (mask_to_group_mask(&cpumask, &group, &group_mask) != 0)
173 handle = OpenThread(THREAD_QUERY_INFORMATION | THREAD_SET_INFORMATION,
175 if (handle == NULL) {
176 log_err("fio_setaffinity: failed to get handle for pid %d\n", pid);
180 /* Set group and mask.
181 * Note: if the GROUP_AFFINITY struct's Reserved members are not
182 * initialised to 0 then SetThreadGroupAffinity will fail with
183 * GetLastError() set to ERROR_INVALID_PARAMETER */
184 new_group_affinity.Mask = (KAFFINITY) group_mask;
185 new_group_affinity.Group = group;
186 new_group_affinity.Reserved[0] = 0;
187 new_group_affinity.Reserved[1] = 0;
188 new_group_affinity.Reserved[2] = 0;
189 if (SetThreadGroupAffinity(handle, &new_group_affinity, NULL) != 0)
192 log_err("fio_setaffinity: failed to set thread affinity (pid %d, group %d, mask %" PRIx64 ", GetLastError=%lu)\n",
193 pid, group, group_mask, GetLastError());
203 static void cpu_to_row_offset(int cpu, int *row, int *offset)
205 *row = cpu / FIO_CPU_MASK_STRIDE;
206 *offset = cpu << FIO_CPU_MASK_STRIDE * *row;
209 int fio_cpuset_init(os_cpu_mask_t *mask)
211 for (int i = 0; i < FIO_CPU_MASK_ROWS; i++)
217 * fio_getaffinity() should not be called once a fio_setaffinity() call has
218 * been made because fio_setaffinity() may put the process into multiple
221 int fio_getaffinity(int pid, os_cpu_mask_t *mask)
224 int row, offset, end, group, group_size, group_start_cpu;
225 DWORD_PTR process_mask, system_mask;
227 PUSHORT current_groups;
232 current_groups = NULL;
233 handle = OpenProcess(PROCESS_QUERY_INFORMATION, TRUE, pid);
234 if (handle == NULL) {
235 log_err("fio_getaffinity: failed to get handle for pid %d\n",
242 * GetProcessGroupAffinity() seems to expect more than the natural
243 * alignment for a USHORT from the area pointed to by current_groups so
244 * arrange for maximum alignment by allocating via malloc()
246 current_groups = malloc(group_count * sizeof(USHORT));
247 if (!current_groups) {
248 log_err("fio_getaffinity: malloc failed\n");
251 if (!GetProcessGroupAffinity(handle, &group_count, current_groups)) {
252 log_err("%s: failed to get single group affinity for pid %d (%lu)\n",
253 __func__, pid, GetLastError());
256 if (group_count > 1) {
257 log_err("%s: pid %d is associated with %d process groups\n",
258 __func__, pid, group_count);
261 if (!GetProcessAffinityMask(handle, &process_mask, &system_mask)) {
262 log_err("%s: GetProcessAffinityMask() failed for pid %d\n",
267 /* Convert group and group relative mask to full CPU mask */
268 online_groups = GetActiveProcessorGroupCount();
269 if (online_groups == 0) {
270 log_err("fio_getaffinity: error retrieving total processor groups\n");
277 dprint(FD_PROCESS, "current_groups=%d group_count=%d\n",
278 current_groups[0], group_count);
280 group_size = GetActiveProcessorCount(group);
281 if (group_size == 0) {
282 log_err("fio_getaffinity: error retrieving size of "
283 "processor group %d\n", group);
285 } else if (group >= current_groups[0] || group >= online_groups)
288 group_start_cpu += group_size;
293 if (group != current_groups[0]) {
294 log_err("fio_getaffinity: could not find processor group %d\n",
299 dprint(FD_PROCESS, "group_start_cpu=%d, group size=%u\n",
300 group_start_cpu, group_size);
301 if ((group_start_cpu + group_size) >= FIO_MAX_CPUS) {
302 log_err("fio_getaffinity failed: current CPU affinity (group "
303 "%d, group_start_cpu %d, group_size %d) extends "
304 "beyond mask's highest CPU (%d)\n", group,
305 group_start_cpu, group_size, FIO_MAX_CPUS);
309 fio_cpuset_init(mask);
310 cpu_to_row_offset(group_start_cpu, &row, &offset);
311 mask->row[row] = process_mask;
312 mask->row[row] <<= offset;
313 end = offset + group_size;
314 if (end > FIO_CPU_MASK_STRIDE) {
316 uint64_t needed_mask;
318 needed = FIO_CPU_MASK_STRIDE - end;
319 needed_mask = (uint64_t)-1 >> (FIO_CPU_MASK_STRIDE - needed);
321 mask->row[row] = process_mask;
322 mask->row[row] >>= needed;
323 mask->row[row] &= needed_mask;
331 free(current_groups);
336 void fio_cpu_clear(os_cpu_mask_t *mask, int cpu)
339 cpu_to_row_offset(cpu, &row, &offset);
341 mask->row[row] &= ~(1ULL << offset);
344 void fio_cpu_set(os_cpu_mask_t *mask, int cpu)
347 cpu_to_row_offset(cpu, &row, &offset);
349 mask->row[row] |= 1ULL << offset;
352 int fio_cpu_isset(os_cpu_mask_t *mask, int cpu)
355 cpu_to_row_offset(cpu, &row, &offset);
357 return (mask->row[row] & (1ULL << offset)) != 0;
360 int fio_cpu_count(os_cpu_mask_t *mask)
364 for (int i = 0; i < FIO_CPU_MASK_ROWS; i++)
365 count += hweight64(mask->row[i]);
370 int fio_cpuset_exit(os_cpu_mask_t *mask)