5 static void print_mask(os_cpu_mask_t *cpumask)
7 for (int i = 0; i < FIO_CPU_MASK_ROWS; i++)
8 dprint(FD_PROCESS, "cpumask[%d]=%" PRIu64 "\n", i, cpumask->row[i]);
11 /* Return the index of the least significant set CPU in cpumask or -1 if no
13 int first_set_cpu(os_cpu_mask_t *cpumask)
15 int cpus_offset, mask_first_cpu, row;
20 while (mask_first_cpu < 0 && row < FIO_CPU_MASK_ROWS) {
23 row_first_cpu = __builtin_ffsll(cpumask->row[row]) - 1;
24 dprint(FD_PROCESS, "row_first_cpu=%d cpumask->row[%d]=%" PRIu64 "\n",
25 row_first_cpu, row, cpumask->row[row]);
26 if (row_first_cpu > -1) {
27 mask_first_cpu = cpus_offset + row_first_cpu;
28 dprint(FD_PROCESS, "first set cpu in mask is at index %d\n",
31 cpus_offset += FIO_CPU_MASK_STRIDE;
36 return mask_first_cpu;
39 /* Return the index of the most significant set CPU in cpumask or -1 if no
41 static int last_set_cpu(os_cpu_mask_t *cpumask)
43 int cpus_offset, mask_last_cpu, row;
45 cpus_offset = (FIO_CPU_MASK_ROWS - 1) * FIO_CPU_MASK_STRIDE;
46 row = FIO_CPU_MASK_ROWS - 1;
48 while (mask_last_cpu < 0 && row >= 0) {
51 if (cpumask->row[row] == 0)
54 uint64_t tmp = cpumask->row[row];
61 dprint(FD_PROCESS, "row_last_cpu=%d cpumask->row[%d]=%" PRIu64 "\n",
62 row_last_cpu, row, cpumask->row[row]);
63 if (row_last_cpu > -1) {
64 mask_last_cpu = cpus_offset + row_last_cpu;
65 dprint(FD_PROCESS, "last set cpu in mask is at index %d\n",
68 cpus_offset -= FIO_CPU_MASK_STRIDE;
76 static int mask_to_group_mask(os_cpu_mask_t *cpumask, int *processor_group, uint64_t *affinity_mask)
78 WORD online_groups, group, group_size;
80 int cpus_offset, search_cpu, last_cpu, bit_offset, row, end;
81 uint64_t group_cpumask;
83 search_cpu = first_set_cpu(cpumask);
85 log_info("CPU mask doesn't set any CPUs\n");
89 /* Find processor group first set CPU applies to */
90 online_groups = GetActiveProcessorGroupCount();
95 while (!found && group < online_groups) {
96 group_size = GetActiveProcessorCount(group);
97 dprint(FD_PROCESS, "group=%d group_start=%d group_size=%u search_cpu=%d\n",
98 group, cpus_offset, group_size, search_cpu);
99 if (cpus_offset + group_size > search_cpu)
102 cpus_offset += group_size;
108 log_err("CPU mask contains processor beyond last active processor index (%d)\n",
114 /* Check all the CPUs in the mask apply to ONLY that processor group */
115 last_cpu = last_set_cpu(cpumask);
116 if (last_cpu > (cpus_offset + group_size - 1)) {
117 log_info("CPU mask cannot bind CPUs (e.g. %d, %d) that are "
118 "in different processor groups\n", search_cpu,
124 /* Extract the current processor group mask from the cpumask */
125 row = cpus_offset / FIO_CPU_MASK_STRIDE;
126 bit_offset = cpus_offset % FIO_CPU_MASK_STRIDE;
127 group_cpumask = cpumask->row[row] >> bit_offset;
128 end = bit_offset + group_size;
129 if (end > FIO_CPU_MASK_STRIDE && (row + 1 < FIO_CPU_MASK_ROWS)) {
130 /* Some of the next row needs to be part of the mask */
131 int needed, needed_shift, needed_mask_shift;
132 uint64_t needed_mask;
134 needed = end - FIO_CPU_MASK_STRIDE;
135 needed_shift = FIO_CPU_MASK_STRIDE - bit_offset;
136 needed_mask_shift = FIO_CPU_MASK_STRIDE - needed;
137 needed_mask = (uint64_t)-1 >> needed_mask_shift;
139 "bit_offset=%d end=%d needed=%d needed_shift=%d needed_mask=%" PRIu64 "needed_mask_shift=%d\n",
140 bit_offset, end, needed, needed_shift, needed_mask,
142 group_cpumask |= (cpumask->row[row + 1] & needed_mask) << needed_shift;
144 group_cpumask &= (uint64_t)-1 >> (FIO_CPU_MASK_STRIDE - group_size);
146 /* Return group and mask */
147 dprint(FD_PROCESS, "Returning group=%d group_mask=%" PRIu64 "\n",
148 group, group_cpumask);
149 *processor_group = group;
150 *affinity_mask = group_cpumask;
155 int fio_setaffinity(int pid, os_cpu_mask_t cpumask)
157 HANDLE handle = NULL;
159 uint64_t group_mask = 0;
160 GROUP_AFFINITY new_group_affinity;
164 if (mask_to_group_mask(&cpumask, &group, &group_mask) != 0)
167 handle = OpenThread(THREAD_QUERY_INFORMATION | THREAD_SET_INFORMATION,
169 if (handle == NULL) {
170 log_err("fio_setaffinity: failed to get handle for pid %d\n", pid);
174 /* Set group and mask.
175 * Note: if the GROUP_AFFINITY struct's Reserved members are not
176 * initialised to 0 then SetThreadGroupAffinity will fail with
177 * GetLastError() set to ERROR_INVALID_PARAMETER */
178 new_group_affinity.Mask = (KAFFINITY) group_mask;
179 new_group_affinity.Group = group;
180 new_group_affinity.Reserved[0] = 0;
181 new_group_affinity.Reserved[1] = 0;
182 new_group_affinity.Reserved[2] = 0;
183 if (SetThreadGroupAffinity(handle, &new_group_affinity, NULL) != 0)
186 log_err("fio_setaffinity: failed to set thread affinity (pid %d, group %d, mask %" PRIx64 ", GetLastError=%lu)\n",
187 pid, group, group_mask, GetLastError());
197 static void cpu_to_row_offset(int cpu, int *row, int *offset)
199 *row = cpu / FIO_CPU_MASK_STRIDE;
200 *offset = cpu << FIO_CPU_MASK_STRIDE * *row;
203 int fio_cpuset_init(os_cpu_mask_t *mask)
205 for (int i = 0; i < FIO_CPU_MASK_ROWS; i++)
211 * fio_getaffinity() should not be called once a fio_setaffinity() call has
212 * been made because fio_setaffinity() may put the process into multiple
215 int fio_getaffinity(int pid, os_cpu_mask_t *mask)
218 int row, offset, end, group, group_size, group_start_cpu;
219 DWORD_PTR process_mask, system_mask;
221 PUSHORT current_groups;
226 current_groups = NULL;
227 handle = OpenProcess(PROCESS_QUERY_INFORMATION, TRUE, pid);
228 if (handle == NULL) {
229 log_err("fio_getaffinity: failed to get handle for pid %d\n",
236 * GetProcessGroupAffinity() seems to expect more than the natural
237 * alignment for a USHORT from the area pointed to by current_groups so
238 * arrange for maximum alignment by allocating via malloc()
240 current_groups = malloc(group_count * sizeof(USHORT));
241 if (!current_groups) {
242 log_err("fio_getaffinity: malloc failed\n");
245 if (!GetProcessGroupAffinity(handle, &group_count, current_groups)) {
246 log_err("%s: failed to get single group affinity for pid %d (%lu)\n",
247 __func__, pid, GetLastError());
250 if (group_count > 1) {
251 log_err("%s: pid %d is associated with %d process groups\n",
252 __func__, pid, group_count);
255 if (!GetProcessAffinityMask(handle, &process_mask, &system_mask)) {
256 log_err("%s: GetProcessAffinityMask() failed for pid %d\n",
261 /* Convert group and group relative mask to full CPU mask */
262 online_groups = GetActiveProcessorGroupCount();
263 if (online_groups == 0) {
264 log_err("fio_getaffinity: error retrieving total processor groups\n");
271 dprint(FD_PROCESS, "current_groups=%d group_count=%d\n",
272 current_groups[0], group_count);
274 group_size = GetActiveProcessorCount(group);
275 if (group_size == 0) {
276 log_err("fio_getaffinity: error retrieving size of "
277 "processor group %d\n", group);
279 } else if (group >= current_groups[0] || group >= online_groups)
282 group_start_cpu += group_size;
287 if (group != current_groups[0]) {
288 log_err("fio_getaffinity: could not find processor group %d\n",
293 dprint(FD_PROCESS, "group_start_cpu=%d, group size=%u\n",
294 group_start_cpu, group_size);
295 if ((group_start_cpu + group_size) >= FIO_MAX_CPUS) {
296 log_err("fio_getaffinity failed: current CPU affinity (group "
297 "%d, group_start_cpu %d, group_size %d) extends "
298 "beyond mask's highest CPU (%d)\n", group,
299 group_start_cpu, group_size, FIO_MAX_CPUS);
303 fio_cpuset_init(mask);
304 cpu_to_row_offset(group_start_cpu, &row, &offset);
305 mask->row[row] = process_mask;
306 mask->row[row] <<= offset;
307 end = offset + group_size;
308 if (end > FIO_CPU_MASK_STRIDE) {
310 uint64_t needed_mask;
312 needed = FIO_CPU_MASK_STRIDE - end;
313 needed_mask = (uint64_t)-1 >> (FIO_CPU_MASK_STRIDE - needed);
315 mask->row[row] = process_mask;
316 mask->row[row] >>= needed;
317 mask->row[row] &= needed_mask;
325 free(current_groups);
330 void fio_cpu_clear(os_cpu_mask_t *mask, int cpu)
333 cpu_to_row_offset(cpu, &row, &offset);
335 mask->row[row] &= ~(1ULL << offset);
338 void fio_cpu_set(os_cpu_mask_t *mask, int cpu)
341 cpu_to_row_offset(cpu, &row, &offset);
343 mask->row[row] |= 1ULL << offset;
346 int fio_cpu_isset(os_cpu_mask_t *mask, int cpu)
349 cpu_to_row_offset(cpu, &row, &offset);
351 return (mask->row[row] & (1ULL << offset)) != 0;
354 int fio_cpu_count(os_cpu_mask_t *mask)
358 for (int i = 0; i < FIO_CPU_MASK_ROWS; i++)
359 count += hweight64(mask->row[i]);
364 int fio_cpuset_exit(os_cpu_mask_t *mask)