--- /dev/null
+#define FIO_MAX_CPUS 512 /* From Hyper-V 2016's max logical processors */
+#define FIO_CPU_MASK_STRIDE 64
+#define FIO_CPU_MASK_ROWS (FIO_MAX_CPUS / FIO_CPU_MASK_STRIDE)
+
+typedef struct {
+ uint64_t row[FIO_CPU_MASK_ROWS];
+} os_cpu_mask_t;
+
+#define FIO_HAVE_CPU_ONLINE_SYSCONF
+/* Return all processors regardless of processor group */
+static inline unsigned int cpus_online(void)
+{
+ return GetMaximumProcessorCount(ALL_PROCESSOR_GROUPS);
+}
+
+static inline void print_mask(os_cpu_mask_t *cpumask)
+{
+ for (int i = 0; i < FIO_CPU_MASK_ROWS; i++)
+ dprint(FD_PROCESS, "cpumask[%d]=%lu\n", i, cpumask->row[i]);
+}
+
+/* Return the index of the least significant set CPU in cpumask or -1 if no
+ * CPUs are set */
+static inline int first_set_cpu(os_cpu_mask_t *cpumask)
+{
+ int cpus_offset, mask_first_cpu, row;
+
+ cpus_offset = 0;
+ row = 0;
+ mask_first_cpu = -1;
+ while (mask_first_cpu < 0 && row < FIO_CPU_MASK_ROWS) {
+ int row_first_cpu;
+
+ row_first_cpu = __builtin_ffsll(cpumask->row[row]) - 1;
+ dprint(FD_PROCESS, "row_first_cpu=%d cpumask->row[%d]=%lu\n",
+ row_first_cpu, row, cpumask->row[row]);
+ if (row_first_cpu > -1) {
+ mask_first_cpu = cpus_offset + row_first_cpu;
+ dprint(FD_PROCESS, "first set cpu in mask is at index %d\n",
+ mask_first_cpu);
+ } else {
+ cpus_offset += FIO_CPU_MASK_STRIDE;
+ row++;
+ }
+ }
+
+ return mask_first_cpu;
+}
+
+/* Return the index of the most significant set CPU in cpumask or -1 if no
+ * CPUs are set */
+static inline int last_set_cpu(os_cpu_mask_t *cpumask)
+{
+ int cpus_offset, mask_last_cpu, row;
+
+ cpus_offset = (FIO_CPU_MASK_ROWS - 1) * FIO_CPU_MASK_STRIDE;
+ row = FIO_CPU_MASK_ROWS - 1;
+ mask_last_cpu = -1;
+ while (mask_last_cpu < 0 && row >= 0) {
+ int row_last_cpu;
+
+ if (cpumask->row[row] == 0)
+ row_last_cpu = -1;
+ else {
+ uint64_t tmp = cpumask->row[row];
+
+ row_last_cpu = 0;
+ while (tmp >>= 1)
+ row_last_cpu++;
+ }
+
+ dprint(FD_PROCESS, "row_last_cpu=%d cpumask->row[%d]=%lu\n",
+ row_last_cpu, row, cpumask->row[row]);
+ if (row_last_cpu > -1) {
+ mask_last_cpu = cpus_offset + row_last_cpu;
+ dprint(FD_PROCESS, "last set cpu in mask is at index %d\n",
+ mask_last_cpu);
+ } else {
+ cpus_offset -= FIO_CPU_MASK_STRIDE;
+ row--;
+ }
+ }
+
+ return mask_last_cpu;
+}
+
+static inline int mask_to_group_mask(os_cpu_mask_t *cpumask, int *processor_group, uint64_t *affinity_mask)
+{
+ WORD online_groups, group, group_size;
+ bool found;
+ int cpus_offset, search_cpu, last_cpu, bit_offset, row, end;
+ uint64_t group_cpumask;
+
+ search_cpu = first_set_cpu(cpumask);
+ if (search_cpu < 0) {
+ log_info("CPU mask doesn't set any CPUs\n");
+ return 1;
+ }
+
+ /* Find processor group first set CPU applies to */
+ online_groups = GetActiveProcessorGroupCount();
+ group = 0;
+ found = false;
+ cpus_offset = 0;
+ group_size = 0;
+ while (!found && group < online_groups) {
+ group_size = GetMaximumProcessorCount(group);
+ dprint(FD_PROCESS, "group=%d group_start=%d group_size=%u search_cpu=%d\n",
+ group, cpus_offset, group_size, search_cpu);
+ if (cpus_offset + group_size > search_cpu)
+ found = true;
+ else {
+ cpus_offset += group_size;
+ group++;
+ }
+ }
+
+ if (!found) {
+ log_err("CPU mask contains processor beyond last active processor index (%d)\n",
+ cpus_offset - 1);
+ print_mask(cpumask);
+ return 1;
+ }
+
+ /* Check all the CPUs in the mask apply to ONLY that processor group */
+ last_cpu = last_set_cpu(cpumask);
+ if (last_cpu > (cpus_offset + group_size - 1)) {
+ log_info("CPU mask cannot bind CPUs (e.g. %d, %d) that are "
+ "in different processor groups\n", search_cpu,
+ last_cpu);
+ print_mask(cpumask);
+ return 1;
+ }
+
+ /* Extract the current processor group mask from the cpumask */
+ row = cpus_offset / FIO_CPU_MASK_STRIDE;
+ bit_offset = cpus_offset % FIO_CPU_MASK_STRIDE;
+ group_cpumask = cpumask->row[row] >> bit_offset;
+ end = bit_offset + group_size;
+ if (end > FIO_CPU_MASK_STRIDE && (row + 1 < FIO_CPU_MASK_ROWS)) {
+ /* Some of the next row needs to be part of the mask */
+ int needed, needed_shift, needed_mask_shift;
+ uint64_t needed_mask;
+
+ needed = end - FIO_CPU_MASK_STRIDE;
+ needed_shift = FIO_CPU_MASK_STRIDE - bit_offset;
+ needed_mask_shift = FIO_CPU_MASK_STRIDE - needed;
+ needed_mask = (uint64_t)-1 >> needed_mask_shift;
+ dprint(FD_PROCESS, "bit_offset=%d end=%d needed=%d needed_shift=%d needed_mask=%ld needed_mask_shift=%d\n", bit_offset, end, needed, needed_shift, needed_mask, needed_mask_shift);
+ group_cpumask |= (cpumask->row[row + 1] & needed_mask) << needed_shift;
+ }
+ group_cpumask &= (uint64_t)-1 >> (FIO_CPU_MASK_STRIDE - group_size);
+
+ /* Return group and mask */
+ dprint(FD_PROCESS, "Returning group=%d group_mask=%lu\n", group, group_cpumask);
+ *processor_group = group;
+ *affinity_mask = group_cpumask;
+
+ return 0;
+}
+
+static inline int fio_setaffinity(int pid, os_cpu_mask_t cpumask)
+{
+ HANDLE handle = NULL;
+ int group, ret;
+ uint64_t group_mask = 0;
+ GROUP_AFFINITY new_group_affinity;
+
+ ret = -1;
+
+ if (mask_to_group_mask(&cpumask, &group, &group_mask) != 0)
+ goto err;
+
+ handle = OpenThread(THREAD_QUERY_INFORMATION | THREAD_SET_INFORMATION,
+ TRUE, pid);
+ if (handle == NULL) {
+ log_err("fio_setaffinity: failed to get handle for pid %d\n", pid);
+ goto err;
+ }
+
+ /* Set group and mask.
+ * Note: if the GROUP_AFFINITY struct's Reserved members are not
+ * initialised to 0 then SetThreadGroupAffinity will fail with
+ * GetLastError() set to ERROR_INVALID_PARAMETER */
+ new_group_affinity.Mask = (KAFFINITY) group_mask;
+ new_group_affinity.Group = group;
+ new_group_affinity.Reserved[0] = 0;
+ new_group_affinity.Reserved[1] = 0;
+ new_group_affinity.Reserved[2] = 0;
+ if (SetThreadGroupAffinity(handle, &new_group_affinity, NULL) != 0)
+ ret = 0;
+ else {
+ log_err("fio_setaffinity: failed to set thread affinity "
+ "(pid %d, group %d, mask %" PRIx64 ", "
+ "GetLastError=%d)\n", pid, group, group_mask,
+ GetLastError());
+ goto err;
+ }
+
+err:
+ if (handle)
+ CloseHandle(handle);
+ return ret;
+}
+
+static inline void cpu_to_row_offset(int cpu, int *row, int *offset)
+{
+ *row = cpu / FIO_CPU_MASK_STRIDE;
+ *offset = cpu << FIO_CPU_MASK_STRIDE * *row;
+}
+
+static inline int fio_cpuset_init(os_cpu_mask_t *mask)
+{
+ for (int i = 0; i < FIO_CPU_MASK_ROWS; i++)
+ mask->row[i] = 0;
+ return 0;
+}
+
+/*
+ * fio_getaffinity() should not be called once a fio_setaffinity() call has
+ * been made because fio_setaffinity() may put the process into multiple
+ * processor groups
+ */
+static inline int fio_getaffinity(int pid, os_cpu_mask_t *mask)
+{
+ int ret;
+ int row, offset, end, group, group_size, group_start_cpu;
+ DWORD_PTR process_mask, system_mask;
+ HANDLE handle;
+ PUSHORT current_groups;
+ USHORT group_count;
+ WORD online_groups;
+
+ ret = -1;
+ current_groups = NULL;
+ handle = OpenProcess(PROCESS_QUERY_INFORMATION, TRUE, pid);
+ if (handle == NULL) {
+ log_err("fio_getaffinity: failed to get handle for pid %d\n",
+ pid);
+ goto err;
+ }
+
+ group_count = 1;
+ /*
+ * GetProcessGroupAffinity() seems to expect more than the natural
+ * alignment for a USHORT from the area pointed to by current_groups so
+ * arrange for maximum alignment by allocating via malloc()
+ */
+ current_groups = malloc(sizeof(USHORT));
+ if (!current_groups) {
+ log_err("fio_getaffinity: malloc failed\n");
+ goto err;
+ }
+ if (GetProcessGroupAffinity(handle, &group_count, current_groups) == 0) {
+ /* NB: we also fail here if we are a multi-group process */
+ log_err("fio_getaffinity: failed to get single group affinity for pid %d\n", pid);
+ goto err;
+ }
+ GetProcessAffinityMask(handle, &process_mask, &system_mask);
+
+ /* Convert group and group relative mask to full CPU mask */
+ online_groups = GetActiveProcessorGroupCount();
+ if (online_groups == 0) {
+ log_err("fio_getaffinity: error retrieving total processor groups\n");
+ goto err;
+ }
+
+ group = 0;
+ group_start_cpu = 0;
+ group_size = 0;
+ dprint(FD_PROCESS, "current_groups=%d group_count=%d\n",
+ current_groups[0], group_count);
+ while (true) {
+ group_size = GetMaximumProcessorCount(group);
+ if (group_size == 0) {
+ log_err("fio_getaffinity: error retrieving size of "
+ "processor group %d\n", group);
+ goto err;
+ } else if (group >= current_groups[0] || group >= online_groups)
+ break;
+ else {
+ group_start_cpu += group_size;
+ group++;
+ }
+ }
+
+ if (group != current_groups[0]) {
+ log_err("fio_getaffinity: could not find processor group %d\n",
+ current_groups[0]);
+ goto err;
+ }
+
+ dprint(FD_PROCESS, "group_start_cpu=%d, group size=%u\n",
+ group_start_cpu, group_size);
+ if ((group_start_cpu + group_size) >= FIO_MAX_CPUS) {
+ log_err("fio_getaffinity failed: current CPU affinity (group "
+ "%d, group_start_cpu %d, group_size %d) extends "
+ "beyond mask's highest CPU (%d)\n", group,
+ group_start_cpu, group_size, FIO_MAX_CPUS);
+ goto err;
+ }
+
+ fio_cpuset_init(mask);
+ cpu_to_row_offset(group_start_cpu, &row, &offset);
+ mask->row[row] = process_mask;
+ mask->row[row] <<= offset;
+ end = offset + group_size;
+ if (end > FIO_CPU_MASK_STRIDE) {
+ int needed;
+ uint64_t needed_mask;
+
+ needed = FIO_CPU_MASK_STRIDE - end;
+ needed_mask = (uint64_t)-1 >> (FIO_CPU_MASK_STRIDE - needed);
+ row++;
+ mask->row[row] = process_mask;
+ mask->row[row] >>= needed;
+ mask->row[row] &= needed_mask;
+ }
+ ret = 0;
+
+err:
+ if (handle)
+ CloseHandle(handle);
+ if (current_groups)
+ free(current_groups);
+
+ return ret;
+}
+
+static inline void fio_cpu_clear(os_cpu_mask_t *mask, int cpu)
+{
+ int row, offset;
+ cpu_to_row_offset(cpu, &row, &offset);
+
+ mask->row[row] &= ~(1ULL << offset);
+}
+
+static inline void fio_cpu_set(os_cpu_mask_t *mask, int cpu)
+{
+ int row, offset;
+ cpu_to_row_offset(cpu, &row, &offset);
+
+ mask->row[row] |= 1ULL << offset;
+}
+
+static inline int fio_cpu_isset(os_cpu_mask_t *mask, int cpu)
+{
+ int row, offset;
+ cpu_to_row_offset(cpu, &row, &offset);
+
+ return (mask->row[row] & (1ULL << offset)) != 0;
+}
+
+static inline int fio_cpu_count(os_cpu_mask_t *mask)
+{
+ int count = 0;
+
+ for (int i = 0; i < FIO_CPU_MASK_ROWS; i++)
+ count += hweight64(mask->row[i]);
+
+ return count;
+}
+
+static inline int fio_cpuset_exit(os_cpu_mask_t *mask)
+{
+ return 0;
+}
projects / fio.git / commitdiff